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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 26, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Entity Registrant Name	U.S. Silica Holdings, Inc.
Entity Central Index Key	0001524741
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		52,989,768

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 42,919	$ 61,022
Accounts receivable, net	65,249	59,564
Inventories, net	42,776	39,835
Prepaid expenses and other current assets	7,686	6,738
Deferred income tax, net	10,122	10,108
Total current assets	168,752	177,267
Property, plant and mine development, net	429,611	414,218
Debt issuance costs, net	1,980	2,111
Goodwill	68,403	68,403
Trade names	10,436	10,436
Customer relationships, net	6,428	6,531
Other assets	8,451	7,844
Total assets	694,061	686,810
Current Liabilities:
Book overdraft	4,376	5,390
Accounts payable	30,307	37,333
Accrued liabilities	10,080	9,481
Accrued interest	154	2
Current portion of capital lease	489
Current portion of long-term debt	2,434	2,433
Short-term debt	10,551
Income tax payable	6,149	20,596
Current portion of deferred revenue	2,938	4,855
Total current liabilities	67,478	80,090
Long-term debt	252,383	252,992
Liability for pension and other post-retirement benefits	52,768	52,747
Deferred income tax, net	60,154	59,111
Other long-term obligations	10,323	10,176
Total liabilities	443,106	455,116
Commitments and contingencies
Stockholders' Equity:
Common stock	529	529
Preferred stock
Additional paid-in capital	164,535	163,579
Retained earnings	100,008	82,731
Treasury stock, at cost	(364)	(970)
Accumulated other comprehensive loss	(13,753)	(14,175)
Total stockholders' equity	250,955	231,694
Total liabilities and stockholders' equity	$ 694,061	$ 686,810

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Sales	$ 122,311	$ 102,591
Cost of goods sold (excluding depreciation, depletion and amortization)	74,412	56,921
Operating expenses
Selling, general and administrative	12,404	9,904
Depreciation, depletion and amortization	8,278	5,978
Total operating expenses	20,682	15,882
Operating income	27,217	29,788
Other (expense) income
Interest expense	(3,576)	(3,797)
Other income, net, including interest income	122	154
Total other (expenses) income	(3,454)	(3,643)
Income before income taxes	23,763	26,145
Income tax expense	(6,486)	(7,032)
Net income	$ 17,277	$ 19,113
Earnings per share:
Basic	$ 0.33	$ 0.37
Diluted	$ 0.32	$ 0.37

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 17,277	$ 19,113
Other comprehensive loss:
Unrealized loss on derivatives (net of tax of $52 and $(4) for the three months ended March 31, 2013 and 2012, respectively)	(81)	(7)
Pension and other post-retirement benefits liability adjustment (net of tax of $218 and $0 for the three months ended March 31, 2013 and 2012, respectively)	(341)
Comprehensive income	$ 16,855	$ 19,106

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Tax expense on unrealized gain (loss) on derivatives	$ 52	$ (4)
Tax expenses on pension and other post-retirement benefits liability adjustment	$ 218	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 17,277	$ 19,113
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	8,278	5,978
Debt issuance amortization	131	113
Original issue discount amortization	42	42
Deferred income taxes	1,029	410
(Gain)/loss on disposal of property, plant and equipment		(439)
Deferred revenue	(1,917)	(1,427)
Equity-based compensation	678	654
Excess tax benefit from equity-based compensation	(96)
Other	(131)	(1,306)
Changes in assets and liabilities:
Accounts receivable	(5,688)	(10,316)
Inventories	(2,941)	(2,629)
Prepaid expenses and other current assets	(948)	2,757
Income taxes	(14,351)	6,445
Accounts payable and accrued liabilities	(6,427)	(9,978)
Advisory services termination fee to holding company		(8,000)
Accrued interest	152	132
Net cash provided by (used in) operating activities	(4,912)	1,549
Investing activities:
Capital expenditures	(22,707)	(14,986)
Proceeds from sale of property, plant and equipment		1,225
Net cash used in investing activities	(22,707)	(13,761)
Financing activities:
Proceeds from issuance of common stock in initial public offering		50,000
Proceeds from options exercised	788
Excess tax benefit from equity-based compensation	96
Repayment of long-term debt	(650)	(650)
Change in book overdraft	(1,014)	(1,418)
Change in revolving credit facility	10,551
Principal payments on capital lease obligations	(255)
Financing fees		(1,304)
Common stock issuance costs		(8,974)
Net cash provided by financing activities	9,516	37,654
Net increase/(decrease) in cash and cash equivalents	(18,103)	25,442
Cash and cash equivalents, beginning of period	61,022	59,199
Cash and cash equivalents, end of period	42,919	84,641
Non-cash financing activities:
Contribution of note payable and accrued interest by holding company		16,692
Capital lease obligations incurred to acquire assets	744
Cash paid during the period for:
Interest	3,196	3,131
Taxes	$ 20,076	$ 173

Organization	3 Months Ended
Organization	Mar. 31, 2013
Accounting Policies [Abstract]
Organization	NOTE A—ORGANIZATION U.S. Silica Holdings, Inc. (“Holdings,” and together with its subsidiaries “we,” “us” or the “Company”), formerly GGC USS Holdings, Inc., was organized as a holding company on November 14, 2008. On November 25, 2008, we acquired Hourglass Acquisitions I, LLC, whose only operating subsidiary was U.S. Silica Company (“U.S. Silica”). On January 31, 2012, we completed an initial public offering of common stock (the “IPO”) through a Registration Statement on Form S-1 (File No. 333-175636), pursuant to which we registered and issued 2,941,176 shares of our common stock, and we registered and certain of our stockholders sold 8,823,529 shares of common stock at an offering price of $17.00 per share. On February 6, 2012, we issued all 2,941,176 shares of common stock for an aggregate offering price of approximately $50.0 million and the selling stockholders sold all 8,823,529 shares of common stock for an aggregate offering price of approximately $150.0 million. As a result of the offering, we received net proceeds of approximately $40.8 million, after deducting $3.5 million of underwriting discounts and commissions and offering expenses of $5.7 million. On January 31, 2012, simultaneously with the initial public offering of our common stock, GGC USS Holdings, LLC, our sole stockholder prior to the IPO and now our largest stockholder, contributed to us all of the stock of its wholly-owned subsidiary, GGC RCS Holdings, Inc., and its operating subsidiary, Coated Sand Solutions, LLC. Prior to this transaction, GGC RCS Holdings, Inc. had a $15.0 million note payable to GGC USS Holdings, LLC which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC USS Holdings, LLC, simultaneously with the IPO. Coated Sand Solutions, LLC is currently developing resin-coated sand proppants for sale into the Oil and Gas market for use in the hydraulic fracturing process.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2013
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE B—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES *Basis of Presentation* The consolidated financial statements as of and for the three months ended March 31, 2013 and 2012 (the “Financial Statements”), present our financial position, results of operations, and cash flows. In consideration of the contribution of GGC RCS Holdings, Inc. to us on January 31, 2012, we and our subsidiaries are presented on a consolidated basis with GGC RCS Holdings, Inc. as of and for the three months ended March 31, 2013 and 2012 and as of the year ended December 31, 2012. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”). Although we believe our disclosures are adequate to make the information presented not misleading, you should read the Financial Statements in this report in conjunction with the combined financial statements and notes to those financial statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012, as filed with the Securities and Exchange Commission (“SEC”) on February 26, 2013 (our “2012 Annual Report”). Certain terms not otherwise defined in this Quarterly Report on Form 10-Q, have the meanings specified in our 2012 Annual Report. In our opinion, our Financial Statements reflect all normal and recurring adjustments necessary to present fairly our financial position as of March 31, 2013, and December 31, 2012, the results of our operations for the three months ended March 31, 2013 and 2012, and our cash flows for the three months ended March 31, 2013 and 2012. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial Statements. We follow Financial Accounting Standards Board ("FASB") Accounting Standards Codification (“ASC”) guidance for identification and reporting of entities over which control is achieved through means other than voting rights. The guidance defines such entities as Variable Interest Entities (“VIEs”). As of March 31, 2013 and for the periods presented herein, we have identified no entities over which we maintain any level of control that would qualify for consolidation under ASC guidance. In order to make this report easier to read, we refer throughout to (i) our Consolidated Balance Sheets as our “Balance Sheets,” and (ii) our Consolidated Statements of Operations as our “Income Statements,” and (iii) our Consolidated Statements of Cash Flows as our “Cash Flows.” *Use of Estimates* The preparation of the Financial Statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of fair value for certain reporting units and asset impairments (including impairments of goodwill and other long-lived assets); write-downs of inventory to net realizable value; post-employment, post-retirement and other employee benefit liabilities; valuation allowances for deferred tax assets; reserves for contingencies and litigation; and the fair value and accounting treatment of financial instruments including derivative instruments. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions. *Unaudited Interim Financial Statements* The accompanying Balance Sheet as of March 31, 2013, the Income Statements for the three months ended March 31, 2013 and 2012; the Consolidated Statements of Comprehensive Income for the three months ended March 31, 2013 and 2012; the Consolidated Statements of Cash Flows for the three months ended March 31, 2013 and 2012; and other information disclosed in the related notes, are unaudited. The Balance Sheet as of December 31, 2012 was derived from our audited consolidated financial statements as included in our 2012 Annual Report. The accompanying Financial Statements should be read in conjunction with the audited combined financial statements and related notes contained in our 2012 Annual Report. *Recently Adopted Accounting Pronouncements* In May 2011, the Financial Accounting Standards Board (“FASB”) issued changes to conform existing guidance regarding fair value measurement and disclosure between GAAP and International Financial Reporting Standards. These changes both clarify the FASB’s intent about the application of existing fair value measurement and disclosure requirements and amend certain principles or requirements for measuring fair value or for disclosing information about fair value measurements. The clarifying changes relate to the application of the highest and best use and valuation premise concepts, measuring the fair value of an instrument classified in a reporting entity’s stockholders’ equity, and disclosure of quantitative information about unobservable inputs used for Level 3 fair value measurements. The amendments relate to measuring the fair value of financial instruments that are managed within a portfolio; application of premiums and discounts in a fair value measurement; and additional disclosures concerning the valuation processes used and sensitivity of the fair value measurement to changes in unobservable inputs for those items categorized as Level 3, a reporting entity’s use of a nonfinancial asset in a way that differs from the asset’s highest and best use, and the categorization by level in the fair value hierarchy for items required to be measured at fair value for disclosure purposes only. We adopted this guidance, effective January 1, 2012, with no material impact on our Financial Statements. In June 2011, the FASB issued changes to the presentation of comprehensive income. These changes give an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements; the option to present components of other comprehensive income as part of the statement of changes in stockholders’ equity was eliminated. The items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income were not changed. Additionally, no changes were made to the calculation and presentation of earnings per share. We adopted this guidance, effective January 1, 2012, with no material impact on our Financial Statements. In September 2011, the FASB issued changes to the testing of goodwill for impairment. These changes provide an entity the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (more than 50%) that the fair value of a reporting unit is less than its carrying amount. Such qualitative factors may include the following: macroeconomic conditions; industry and market considerations; cost factors; overall financial performance; and other relevant entity-specific events. If an entity elects to perform a qualitative assessment and determines that an impairment is more likely than not, the entity is then required to perform the existing two-step quantitative impairment test, otherwise no further analysis is required. An entity also may elect not to perform the qualitative assessment and, instead, go directly to the two-step quantitative impairment test. We adopted this guidance, effective January 1, 2012 with no material impact on our Financial Statements. In September 2011, the FASB issued changes to increase the level of disclosure about an employer’s participation in a multiemployer pension plan. These changes require that employers provide additional separate quantitative and qualitative disclosures for multiemployer pension plans and multiemployer other post-retirement benefit plans, including the significant multiemployer plan(s) in which an employer participates, the level at which an employer participates in the plan(s), the financial health of the plan(s) and the nature of the employer commitments to the plan(s). We adopted this guidance, effective January 1, 2012 with no material impact on our Financial Statements. In July 2012, the FASB issued changes to the testing of indefinite-lived intangible assets for impairment. These changes provide an entity the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (more than 50%) that the fair value of an indefinite-lived intangible asset is less than its carrying amount. In accordance with the amendment, an entity has the option first to assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the indefinite-lived intangible asset is impaired. In conducting a qualitative assessment, an entity should consider the extent to which relevant events and circumstances, both individually and in the aggregate, could have affected the significant inputs used to determine the fair value of the indefinite-lived intangible asset since the last assessment. If, after assessing the totality of events and circumstances, an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount. An entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test. An entity will be able to resume performing the qualitative assessment in any subsequent period. We adopted this guidance, effective for the 2012 reporting period with no material impact on our Financial Statements. In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income ("ASC Topic 220"): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” which requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, entities are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, entities are required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail on these amounts. We adopted this guidance, effective for the 2013 reporting period with no material impact on our Financial Statements.

Earnings Per Share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

NOTE C—EARNINGS PER SHARE

On November 25, 2008, we issued 1,000 shares of our common stock to our then sole stockholder, GGC USS Holdings, LLC, for an aggregate purchase price of $10.00. The shares were issued in reliance on Section 4(2) of the Securities Act as the sale of the securities did not involve a public offering. Appropriate legends were affixed to the securities issued in this transaction. On July 8, 2011, our board of directors approved and we subsequently filed an amended and restated certificate of incorporation which, among other things, increased the authorized shares of common stock to 100 million shares. The amended and restated certificate of incorporation also created a 50,000-for-one split of our common stock. All of our common stock share and per share data contained in the financial statements has been retroactively adjusted to reflect this stock split for all periods presented.

Basic income per common share is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted income per common share is computed similarly to basic income per common share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common shares had been issued. In accordance with the applicable accounting guidance for calculating earnings per share, we did not include in our calculation of diluted earnings per share for the applicable periods, stock options where the exercise prices were greater than the average market prices.


	Three Months Ended March 31,
	2013		2012
Net income available for stockholders:	$	17,277	$	19,113
Less dividends paid:
Common stock		—		—
Restricted shares of common stock		—		—

Undistributed earnings	$	17,277	$	19,113


Allocation of undistributed earnings:
Common stock		17,251		19,113
Restricted shares of common stock		26		—

Basic shares outstanding:
Common stock		52,866		51,939
Restricted shares of common stock		80		—

		52,946		51,939


Diluted shares outstanding:
Common stock		52,866		51,939
Dilutive effect of options		265		—

		53,131		51,939
Restricted shares of common stock		80		—

		53,211		51,939


Basic earnings per share:
Common stock:
Distributed earnings	$	—	$	—
Undistributed earnings		0.33		0.37

	$	0.33	$	0.37


Restricted shares of common stock:
Distributed earnings	$	—	$	—
Undistributed earnings		0.33		—

	$	0.33	$	—


Diluted earnings per share:
Common stock
Distributed earnings	$	—	$	—
Undistributed earnings		0.32		0.37

	$	0.32	$	0.37

Capital Structure and Accumulated Comprehensive Income

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Capital Structure and Accumulated Comprehensive Income

NOTE D—CAPITAL STRUCTURE AND ACCUMULATED COMPREHENSIVE INCOME

Common Stock

Our Amended and Restated Certificate of Incorporation, authorizes up to 500,000,000 shares of common stock, par value of $0.01. Subject to the rights of holders of any series of preferred stock, all of the voting power of the stockholders of Holdings shall be vested in the holders of the common stock. There were 52,987,227 shares of common stock issued and outstanding at March 31, 2013. As of March 31, 2012, there were 52,941,176 shares issued and outstanding. On April 29, 2013, the Company’s board of directors declared a quarterly cash dividend of $0.125 per share to common shareholders of record at the close of business on June 19, 2013, payable on July 3, 2013.

Management and our Board of Directors remain committed to evaluating additional ways of creating shareholder value. Any determination to pay dividends and other distributions in cash, stock, or property by Holdings in the future will be at the discretion of our Board of Directors and will be dependent on then-existing conditions, including our business conditions, our financial condition, results of operations, liquidity, capital requirements, contractual restrictions including restrictive covenants contained in our debt agreements, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common stock may be limited by restrictions on the ability of our subsidiaries to pay dividends or make distributions to us, including restrictions under the terms of the agreements governing our indebtedness.

Preferred Stock

Our Amended and Restated Certificate of Incorporation authorizes our Board of Directors to issue up to 10,000,000 shares, in the aggregate, of preferred stock, par value of $0.01 in one or more series and to fix the preferences, powers and relative, participating, optional or other special rights and qualifications, limitations or restrictions thereof, including the dividend rate, conversion rights, voting rights, redemption rights and liquidation preference and to fix the number of shares to be included in any such series without any further vote or action by our stockholders.

There are no shares of preferred stock issued or outstanding at March 31, 2013 and 2012. At present, we have no plans to issue any preferred stock.

Initial Public Offering

On January 31, 2012, we completed an initial public offering of 2,941,176 shares of our common stock at an offering price of $17.00 per share for an aggregate offering price of approximately $50.0 million. As a result of the offering, we received net proceeds of approximately $40.8 million, after deducting $3.5 million of underwriting discounts and commissions and offering expenses of $5.7 million.

Simultaneously with the initial public offering of our common stock, GGC USS Holdings, LLC, our parent and sole stockholder prior to the IPO and now our largest stockholder, contributed to us all of the stock of its wholly-owned subsidiary, GGC RCS Holdings, Inc., and its operating subsidiary, Coated Sand Solutions, LLC. Prior to this transaction, GGC RCS Holdings, Inc. had a $15.0 million note payable to GGC USS Holdings, LLC, which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC USS Holdings, LLC.

Share Repurchase Program

On June 11, 2012, our Board of Directors authorized us to repurchase up to $25.0 million of our common stock. The authorization remains open for a period of 18 months, concluding on December 11, 2013. We are authorized to repurchase, from time to time, shares of our outstanding common stock on the open market or in privately negotiated transactions using available cash. The timing and amount of stock repurchases will depend on a variety of factors, including market conditions and corporate and regulatory considerations. The share repurchase program may be suspended, modified or discontinued at any time, and we have no obligation to repurchase any additional amount of our common stock under the program. We intend to make all repurchases in compliance with applicable regulatory guidelines and to administer the plan in accordance with applicable laws, including Rule 10b-18 of the Securities Exchange Act of 1934, as amended.

As of March 31, 2013, we have repurchased 100,000 shares of our common stock, at an average price of $10.72 and have the authorization to repurchase up to an additional $23.9 million of our common stock under the program. Of the 100,000 shares repurchased, 66,051 have been re-issued to satisfy employee option exercises leaving total treasury shares of 33,949 as of March 31, 2013.

Stockholders’ Equity

The following table presents the activity included in stockholders’ equity during the three months ended March 31, 2013.


	Common Stock		Treasury Stock			Additional Paid-In Capital		Retained Earnings (Deficit)		Accumulated Other Comprehensive Income (Loss)			Total Stockholders’ Equity
Balance at December 31, 2012	$	529	$	(970	)	$	163,579	$	82,731	$	(14,175	)	$	231,694
Net Income		—		—			—		17,277		—			17,277
Unrealized loss on derivatives		—		—			—		—		81			81
Minimum pension liability		—		—			—		—		341			341
Proceeds from options exercised		—		606			182		—		—			788
Equity-based compensation		—		—			678		—		—			678
Excess tax benefit from equity-based compensation		—		—			96		—		—			96

Balance at March 31, 2013	$	529	$	(364	)	$	164,535	$	100,008	$	(13,753	)	$	250,955

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) consists of fair value adjustments associated with cash flow hedges and accumulated adjustments for net experience losses and prior service cost related to employee benefit plans. The following table presents the changes in accumulated other comprehensive income by component during the three months ended March 31, 2013:


	For the Quarter Ended March 31, 2013
	Unrealized loss on derivatives			Pension and other postretirement benefits liability			Total
Beginning Balance	$	(183	)	$	(13,992	)	$	(14,175	)
Other comprehensive income before reclassifications		—			—			—
Amounts reclassed from accumulated other comprehensive income		81			341			422

Ending Balance	$	(102	)	$	(13,651	)	$	(13,753	)

The following table presents the reclassifications out of accumulated other comprehensive income (loss) during the three months ended March 31, 2013:


Details about accumulated other comprehensive income	Amount reclassified from accumulated other comprehensive income			Affected line item in the statement of operations
Gains and losses on derivatives
Interest rate contracts	$	133		Interest expense
		(52	)	Tax expense

	$	81		Net of tax

Amortization of postretirement benefits liability
Actuarial gains/(losses)	$	536		⁽¹⁾
Prior service cost		23		⁽¹⁾

	$	559		Total before tax
		(218	)	Tax expense

		341		Net of tax

Total reclassifications for the period	$	(422	)	Net of tax

⁽¹⁾	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see note Q).

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accounts Receivable

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Accounts Receivable

NOTE E—ACCOUNTS RECEIVABLE

At March 31, 2013 and December 31 2012, accounts receivable consisted of the following:


	March 31, 2013			December 31, 2012
Trade receivables	$	62,710		$	56,519
Less: Allowance for doubtful accounts		(1,056	)		(1,053	)

Net trade receivables		61,654			55,466
Other receivables		3,595			4,098

Total accounts receivable	$	65,249		$	59,564

Changes in our allowance for doubtful accounts during the three months ended March 31, 2013 are as follows:


	Allowance for Doubtful Accounts
Beginning balance	$	(1,053	)
Bad debt provision		—
Accounts recovered		(3	)

Ending balance	$	(1,056	)

Our five largest customers accounted for approximately 23% and 26% of sales in the three months ended March 31, 2013 and 2012, respectively. No single individual customer accounted for more than 10% of sales in the three months ended March 31, 2013 and 2012.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

+ Details

Inventories

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Inventories

NOTE F—INVENTORIES

At March 31, 2013 and December 31, 2012, inventories consisted of the following:


	March 31, 2013		December 31, 2012
Supplies	$	14,298	$	13,472
Raw materials and work in process		8,544		10,720
Finished goods		19,934		15,643

Total inventories	$	42,776	$	39,835

Inventories include spare parts and supplies for routine facilities maintenance, raw stockpiles and silica and other industrial sand available for shipment. We value inventory at the lower of cost or market. Cost is determined using the first-in, first-out and average cost methods.

Property, Plant and Mine Development

3 Months Ended

Mar. 31, 2013

Property Plant And Equipment [Abstract]

Property, Plant and Mine Development

NOTE G—PROPERTY, PLANT AND MINE DEVELOPMENT

At March 31, 2013 property, plant and mine development consisted of the following:


	As of March 31, 2013
	Cost		Accumulated Depreciation/ Amortization			Net Book Value
Mining property and mine development	$	163,538	$	(16,835	)	$	146,703
Asset retirement cost		5,124		(661	)		4,463
Land		25,824		—			25,824
Land improvements		29,366		(4,743	)		24,623
Buildings		33,221		(4,892	)		28,329
Machinery and equipment		235,294		(59,201	)		176,093
Furniture and fixtures		945		(171	)		774

		493,312		(86,503	)		406,809
Construction-in-progress		22,802		—			22,802

	$	516,114	$	(86,503	)	$	429,611

At December 31, 2012 property, plant and mine development consisted of the following:


	As of December 31, 2012
	Cost		Accumulated Depreciation/ Amortization			Net Book Value
Mining property and mine development	$	163,538	$	(15,778	)	$	147,760
Asset retirement cost		5,124		(597	)		4,527
Land		24,795		—			24,795
Land improvements		27,604		(4,034	)		23,570
Buildings		31,558		(4,354	)		27,204
Machinery and equipment		221,139		(53,599	)		167,540
Furniture and fixtures		915		(142	)		773

		474,673		(78,504	)		396,169
Construction-in-progress		18,049		—			18,049

	$	492,722	$	(78,504	)	$	414,218

Depreciation, depletion and amortization expense, excluding accretion expense related to the asset retirement obligation, recognized during the three months ended March 31, 2013 and 2012 was $8.2 million and $5.8 million, respectively.

The amount of interest costs capitalized in property, plant and equipment was $128 and $65 for the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, we hold $744 assets under a capital lease obligation.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Accrued Liabilities

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Accrued Liabilities

NOTE H—ACCRUED LIABILITIES

At March 31, 2013 and December 31, 2012, accrued liabilities consisted of the following:


	March 31, 2013		December 31, 2012
Accrued salaries and wages	$	1,926	$	2,939
Accrued vacation liability		2,355		2,397
Current portion of liability for pension and post-retirement benefits		1,627		1,413
Accrued healthcare liability		1,316		1,278
Other accrued liabilities		2,856		1,454

Total accrued liabilities	$	10,080	$	9,481

We are self-insured for health care claims for eligible participating employees and qualified dependent medical claims, subject to deductibles and limitations. Our liabilities for claims incurred but not reported (IBNR) are determined based on an estimate of the ultimate aggregate liability for claims incurred. The estimate is calculated from actual historical claim rates and reviewed and adjusted periodically, as necessary.

Other accrued liabilities consist of taxes payable, accrued shipping costs, royalties payable, and other immaterial items.

Debt

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Debt

NOTE I—DEBT

At March 31, 2013 and December 31, 2012, debt consisted of the following:


	March 31, 2013			December 31, 2012
Revolving line-of-credit: (expires October 31, 2016) (5.0% at March 31, 2013 and December 31, 2012)	$	10,551		$	—
Senior secured credit facility:
Term loan facility (final maturity June 8, 2017) (4.75% at March 31, 2013 and December 31, 2012), net of unamortized original issue discount of $633 and $675, respectively		254,817			255,425

Total debt		265,368			255,425
Less: current portion		(12,985	)		(2,433	)

Total long-term portion of debt	$	252,383		$	252,992

Revolving Line-of-Credit

As of March 31, 2013, the available borrowing base under our asset-based revolving line-of-credit (the “Revolver”) was $50.0 million, with $10.6 million drawn as of that date and $10.4 million allocated for letters of credit leaving $29.0 million available for general corporate use under this revolving credit agreement. Since the agreement contains a lock-box arrangement whereby receipts from customers are automatically used to repay any borrowings, amounts outstanding under the agreement are classified as a current liability.

Debt Maturities

As of March 31, 2013, contractual maturities of our debt are as follows:


2013	$	12,376
2014		2,435
2015		2,436
2016		124,648
2017		123,473
Thereafter		—

	$	265,368

On December 31, 2012, we amended our Revolver. The primary revisions to the Revolver included an increase of the commitment under the Revolver from $35 million to $50 million, and the letter of credit sublimit from $15 million to $20 million; provided, however, that the aggregate principal amount of the loans and letters of credit obligations outstanding at any one time shall not exceed the borrowing base as calculated pursuant to the agreement. The amendment also extended the termination date of the Revolver from October 31, 2015 to October 31, 2016, reduced prices and fees on borrowings, letters of credit and unused commitments and added an additional subsidiary, Coated Sand Solutions, LLC, as a co-borrower.

On January 31, 2012, we amended our senior secured term loan facility (the “Term Loan”). The primary revisions to the Term Loan were to eliminate a requirement to provide monthly financial reports, to remove financial covenant restrictions related to capital expenditures, to provide flexibility to make investments and acquisitions and to incur indebtedness, and to provide a new subsidiary guarantee from Coated Sand Solutions, LLC.

The Term Loan is secured by substantially all of our assets with the exception of our accounts receivable and inventory, for which we have pledged as collateral under the Revolver. As of March 31, 2013, we are in compliance with all covenants in accordance with our debt agreements.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Asset Retirement Obligations

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

NOTE J—ASSET RETIREMENT OBLIGATIONS

Mine reclamation costs, or future remediation costs for inactive mines, are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred at a site. Such cost estimates include, where applicable, ongoing care, maintenance and monitoring costs. Changes in estimates at inactive mines are reflected in earnings in the period an estimate is revised.

As of March 31, 2013 and December 31, 2012, we had recorded a liability of $6.8 million and $6.7 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation during the three month period ended March 31, 2013 and the year ended December 31, 2012 are as follows:


	March 31, 2013		December 31, 2012 ⁽¹⁾
Beginning balance	$	6,659	$	9,504
Liabilities settled/payments		—		—
Accretion expense		114		658
Additions, revisions of prior estimates and other		—		(3,503	)

Ending balance	$	6,773	$	6,659

⁽¹⁾	Represents change in the asset retirement obligation during the 12-month period ended December 31, 2012.

Fair Value Accounting

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Accounting

NOTE K—FAIR VALUE ACCOUNTING

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

Cash equivalents

Due to the short-term maturity, we believe that our cash equivalent instruments at March 31, 2013 and December 31, 2012 approximate their reported carrying values.

Long-Term Debt, including current maturities

We believe that the fair values of our long-term debt, including current maturities, approximates their carrying values and based on their effective interest rates compared to current market rates.

Derivative Instruments

The estimated fair value of our derivative assets (interest rate caps) are recorded at each reporting period and are based upon widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative contract. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. We also incorporate credit valuation adjustments to appropriately reflect both our nonperformance risk as well as that of the respective counterparty in the fair value measurements.

Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, as of March 31, 2013, we have assessed that the impact of the credit valuation adjustments on the overall valuation of our derivative positions is not significant. As a result, we have determined that our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

In accordance with the fair value hierarchy, the following table presents the fair value as of March 31, 2013, of those derivative assets that we must measure at fair value on a recurring basis:

Level 1

Level 2

Level 3

Total

Interest rate derivatives

—

Net asset

—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Number 107
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+ Details

Derivative Instruments

3 Months Ended

Mar. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments

NOTE L—DERIVATIVE INSTRUMENTS

We are exposed to certain risks arising from both our business operations and economic conditions. We principally manage our exposure to a wide variety of business and operation risks through management of our core business activities. Specifically, we enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and unknown cash amounts, the value of which are determined by current interest rates. Interest rate derivatives are utilized in the normal course of business to manage our interest cost and the risk associated with changing interest rates. We do not use derivative financial instruments for trading or speculative purposes. By their nature, all such instruments involve risk, including the possibility that a loss may occur from the failure of another party to perform according to the terms of a contract (credit risk) or the possibility that future changes in market price may make a financial instrument less valuable or more onerous (market risk). As is customary for these types of instruments, we do not require collateral or other security from other parties to these instruments. In management’s opinion, there is no significant risk of loss in the event of nonperformance of the counterparties to these financial instruments.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we primarily use interest rate cap agreements as part of our interest rate risk management strategy. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium.

In connection with the Term Loan, we have entered into two interest rate cap agreements that effectively place an upper limit for one-month LIBOR at 4.0 percent on the interest rate charged for $130.0 million of our floating rate Term Loan. On March 31, 2012, one of the agreements with a notional amount of $100.0 million matured. Concurrently with the maturity, the notional amount of a second agreement with an original notional amount of $30.0 million automatically increased to $130.0 million per the terms of the contract. No additional expense was reclassified from accumulated other comprehensive income or recognized directly in earnings as a result of the maturity or adjustment.

We assess the effectiveness of our hedges in offsetting the variability in the cash flow of the hedged obligations on a quarterly basis. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in equity as accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months ended March 31, 2013 and December 31, 2012, we had no ineffectiveness for such contracts.

The following table summarizes the fair value of our derivative instruments. See Note K for additional disclosures regarding the estimated fair values of our derivative instruments at March 31, 2013 and December 31, 2012.


		March 31, 2013						December 31, 2012
	Maturity Date	Contract/Notional Amount		Carrying Amount		Fair Value		Contract/Notional Amount		Carrying Amount		Fair Value

Interest rate cap agreement⁽¹⁾	2013	$	130 million	$	—	$	—	$	130 million	$	—	$	—

⁽¹⁾	Agreements limit the LIBOR floating interest rate base to 4%.

We have designated these contracts as qualified cash flow hedges. Accordingly, the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income and recognized in earnings in the same period or periods during which the hedged transaction affects earnings.

The following table summarizes the effect of our derivatives instruments on our income statements and our condensed consolidated statements of comprehensive income for the three months ended March 31, 2013 and 2012.


	Three Months Ended March 31,
	2013			2012
Deferred losses from derivatives in OCI, beginning of period	$	(183	)	$	(409	)
Gain (loss) recognized in OCI from derivative instruments		—			(7	)
Gain (loss) reclassified from Accumulated OCI into income		81			—

Deferred losses from derivatives in OCI, end of period	$	(102	)	$	(416	)

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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+ Details

Equity-Based Compensation	3 Months Ended
Equity-Based Compensation	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	NOTE M—EQUITY-BASED COMPENSATION We recognize the cost of employee services rendered in exchange for awards of equity instruments, such as stock options and restricted stock, based on the fair value of those awards at the date of the grant. Compensation expense for equity units is recognized, on a straight-line basis, net of forfeitures, over the requisite service period for the fair value of the awards that actually vest. As of March 31, 2013, we maintain two equity incentive plans (i) the GGC USS Holdings, LLC Management Equity Program (the “Equity Program”), and (ii) the U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan (the “2011 Plan”). The Equity Program granted Class C and Class D member units in GGC USS Holdings, LLC to three members of executive management; one of whom continues to be employed by us at March 31, 2013. The 2011 Plan provides for grants of stock options, stock appreciation rights, restricted stock and other incentive-based awards. For awards granted under the Equity Program, we recognized $27 and $55 of compensation expense during the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $173 of total unrecognized compensation expense related to equity incentive shares, which is expected to be recognized over a weighted-average period of approximately 1.59 years. For awards granted under the 2011 Plan, we recognized $651 and $599 of compensation expense during the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $6.8 million of total unrecognized compensation expense related to equity incentive awards, which is expected to be recognized over a weighted-average period of approximately 2.97 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
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+ Details

Leases

3 Months Ended

Mar. 31, 2013

Leases [Abstract]

Leases

NOTE N—LEASES

We are obligated under certain operating leases and rental agreements for railroad cars, office space, mining property, mining/processing equipment and transportation and other equipment. Future minimum annual commitments under such operating leases at March 31, 2013 are as follows:


2013		10,969
2014		8,357
2015		7,617
2016		5,980
2017		4,138
Thereafter		5,696

Total future lease commitments	$	42,757

Expense related to operating leases and rental agreements was $3.3 million and $2.6 million for the three months ended March 31, 2013 and 2012, respectively.

We also have an obligation under capital lease of $489 as of March 31, 2013. It is expected that this obligation will be paid in full by December 31, 2013.

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References + Details

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE O—COMMITMENTS AND CONTINGENCIES Our operating subsidiary, U.S. Silica Company (“U.S. Silica”), has been named as a defendant in various product liability claims alleging silica exposure causing silicosis. During the three months ended March 31, 2013, no new claims were brought against U.S. Silica. As of March 31, 2013, there were 93 active silica-related products liability claims pending in which U.S. Silica is a defendant. Although the outcomes of these claims cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on our financial position or results of operations. For periods prior to 1986, U.S. Silica had numerous insurance policies and an indemnity from a former owner that covered silicosis claims. In the fourth quarter of 2012, U.S. Silica settled all rights under the indemnity and its underlying insurance policies receiving $5.1 million from the parties involved. As a result of the settlement, the indemnity and related policies are no longer available to U.S. Silica and U.S. Silica will not seek reimbursement for any defense costs or claim payments. Other insurance policies, however, continue to remain available to U.S. Silica. We have recorded estimated liabilities for these claims in other long-term obligations as well as estimated recoveries under the indemnity agreement and an estimate of future recoveries under insurance in other assets on our consolidated balance sheets. As of March 31, 2013 and December 31, 2012, other noncurrent assets included $247 for insurance for third-party products liability claims and other long-term obligations included $1.2 million and $1.3 million, respectively, in third-party products claim liability.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income Taxes	NOTE P—INCOME TAXES We evaluate our deferred tax assets periodically to determine if valuation allowances are required. Ultimately, the realization of deferred tax assets is dependent upon generation of future taxable income during those periods in which temporary differences become deductible and/or credits can be utilized. To this end, management considers the level of historical taxable income, the scheduled reversal of deferred tax liabilities, tax-planning strategies and projected future taxable income. Based on these considerations, and the carry-forward availability of a portion of the deferred tax assets, management believes it is more likely than not that we will realize the benefit of the deferred tax assets. At the end of each reporting period as presented, there were no material amounts of interest and penalties recognized in the statement of operations or balance sheets. We have no material unrecognized tax benefits or any known material tax contingencies at March 31, 2013 and December 31, 2012. Tax returns filed with the IRS for the years 2009 through 2011 along with tax returns filed with numerous state entities remain subject to examination. In accordance with generally accepted accounting principles, it is our practice at the end of each interim reporting period to make our best estimate of the effective tax rate expected to be applicable for the full fiscal year. Estimates are revised as additional information becomes available. The largest permanent item in computing both our effective tax rate and taxable income is the deduction allowed for statutory depletion. The deduction for statutory depletion does not necessarily change proportionately to changes in income before income taxes.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Pension and Post-Retirement Benefits

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Pension and Post-Retirement Benefits

NOTE Q—PENSION AND POST-RETIREMENT BENEFITS

We maintain a noncontributory defined benefit pension plan covering certain employees. Net periodic pension benefit cost recognized for the three months ended March 31, 2013 and 2012 are as follows:


	Three Months Ended March 31,
	2013			2012
Service cost	$	320		$	275
Interest cost		1,049			1,160
Expected return on plan assets		(1,265	)		(1,301	)
Amortization of prior service cost		21			2
Amortization of net (gain) loss		455			353

Net periodic benefit cost	$	580		$	489

In addition, we provide defined benefit post-retirement healthcare and life insurance benefits to some employees. Net periodic post-retirement benefit cost recognized for the three months ended March 31, 2013 and 2012 are as follows:


	Three Months Ended March 31,
	2013			2012
Service cost	$	58		$	58
Interest cost		253			296
Expected return on plan assets		(1	)		(1	)
Amortization of net (gain) loss		74			95

Net periodic benefit cost	$	384		$	448

We contributed $0 and $2.2 million to the qualified pension plan during the three months ended March 31, 2013 and 2012, respectively. Total expected employer funding contributions during the fiscal year ending December 31, 2013 are $2.3 million for the pension plan, and $1.3 million for the post-retirement medical and life plan.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/topic&trid=2235017

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-Number FAS88
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Number 158
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-Name Accounting Principles Board Opinion (APB)
-Number 30
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+ Details

Obligations Under Guarantees	3 Months Ended
Obligations Under Guarantees	Mar. 31, 2013
Product Warranties Disclosures [Abstract]
Obligations Under Guarantees	NOTE R—OBLIGATIONS UNDER GUARANTEES We have indemnified St. Paul Travelers (“Travelers”) against any loss Travelers may incur in the event that holders of surety bonds, issued on our behalf by Travelers, execute the bonds. As of March 31, 2013, Travelers had $4.7 million in bonds outstanding for us. The majority of these bonds ($4.6 million) relate to reclamation requirements issued by various governmental authorities. Reclamation bonds remain outstanding until the mining area is reclaimed and the authority issues a formal release. The remaining bonds relate to such indefinite purposes as licenses, permits, and tax collection. We have indemnified Safeco Insurance Company of America (“Safeco”) against any loss Safeco may incur in the event that holders of surety bonds, issued on our behalf by Safeco, execute the bonds. As of March 31, 2013, Safeco had $513 in bonds outstanding for us. These are all reclamation bonds. U.S. Silica is the contingent guarantor of Kanawha Rail Corporation’s (“KRC”) obligations as lessee of 199 covered hopper railroad cars, which are used by U.S. Silica to ship sand to its customers. KRC’s obligation as lessee includes paying monthly rent of $66 until June 30, 2013, maintaining the cars, paying for any cars damaged or destroyed, and indemnifying all other parties to the lease transaction against liabilities including any loss of certain tax benefits. By separate agreement between U.S. Silica and KRC, KRC may, upon the occurrence of certain events, assign the lease obligations to U.S. Silica, but none of these events have occurred.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2013
Related Party Transactions [Abstract]
Related Party Transactions	NOTE S—RELATED PARTY TRANSACTIONS Advisory Agreement In connection with our acquisition by an affiliate of Golden Gate Capital (the “Golden Gate Capital Acquisition”), we entered into an Advisory Agreement with Golden Gate Capital (the “Advisory Agreement”) whereby Golden Gate Capital agreed to provide business and organizational strategy and financial and advisory services. Such services included support and assistance to management with respect to negotiating and analyzing acquisitions and divestitures, negotiating and analyzing financing alternatives, preparing financial projections, monitoring compliance with financing agreements, marketing functions and searching for and hiring management personnel. As compensation for these services, we agreed to pay Golden Gate Capital (1) an annual advisory fee in the aggregate amount equal to $1.3 million, payable quarterly in arrears, and (2) a transaction fee of 1.25% of the aggregate value of each transaction resulting in a change in control of our parent LLC or its subsidiaries, along with each acquisition, divestiture, recapitalization and financing. In addition to the fees described above, we also reimbursed Golden Gate Capital for all out-of-pocket costs incurred by Golden Gate Capital in connection with its activities under the Advisory Agreement, and indemnified Golden Gate Capital from and against all losses, claims, damages and liabilities related to the performance of its duties under the Advisory Agreement. On February 6, 2012, we paid $8.0 million to Golden Gate Capital to terminate the advisory agreement previously entered into in connection with the Golden Gate Capital Acquisition. The $8.0 million termination fee was accrued for at December 31, 2011 and no additional expense was recognized during the year ended December 31, 2012 or as of the three months ended March 31, 2013. Promissory Note On December 22, 2010, GGC RCS Holdings, Inc., entered into a $15.0 million promissory note with GGC USS Holdings, LLC, our sole stockholder prior to the IPO and now largest stockholder. The note provided working capital for a new subsidiary and matures on December 22, 2015. The note bore interest at 10%. Outstanding principal and interest under the note was payable upon demand, but no later than the maturity date. Upon sole election by the parent, any unpaid interest could be paid in cash on December 22 of each year until the maturity date. Interest on the note was recorded in interest expense in the Income Statements and any unpaid interest was included in accrued interest on the Balance Sheets. On January 31, 2012, simultaneously with the IPO, GGC USS Holdings, LLC contributed to us all of the stock of GGC RCS Holdings, Inc. and converted the $15.0 million promissory note, including $1.7 million of accrued interest, to equity.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph b
-Article 3A

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
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+ Details

Segment Reporting

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Segment Reporting

NOTE T—SEGMENT REPORTING

Our business is organized into two reportable segments, Oil & Gas Proppants and Industrial & Specialty Products, based on end markets. The reportable segments are consistent with how management views the markets that we serve and the financial information reviewed by the chief operating decision maker. We manage our Oil & Gas Proppants and Industrial & Specialty Products businesses as components of an enterprise for which separate information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance.

An operating segment’s performance is primarily evaluated based on segment contribution margin, which excludes certain corporate costs not associated with the operations of the segment. These corporate costs are separately stated below and include costs that are related to functional areas such as operations management, corporate purchasing, accounting, treasury, information technology, legal and human resources. We believe that segment contribution margin, as defined above, is an appropriate measure for evaluating the operating performance of our segments. However, this measure should be considered in addition to, not a substitute for, or superior to, income from operations or other measures of financial performance prepared in accordance with generally accepted accounting principles. The other accounting policies of each of the two reporting segments are the same as those in the summary of significant accounting policies included in Note B.

In the Oil & Gas Proppants segment, we serve the oil and gas recovery market providing fracturing sand, or “frac sand,” which is pumped down oil and natural gas wells to prop open rock fissures and increase the flow rate of natural gas and oil from the wells.

The Industrial & Specialty Products segment consists of over 250 products and materials used in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.

The following table presents sales and segment contribution margin for the reporting segments and other operating results not allocated to the reported segments for the three months ended March 31, 2013 and 2012:


	Three Months Ended March 31,
	2013			2012
Sales:
Oil and Gas Proppants	$	73,582		$	53,810
Industrial and Specialty Products		48,729			48,781

Total sales		122,311			102,591
Segment contribution margin:
Oil and Gas Proppants		36,162			35,065
Industrial and Specialty Products		13,246			12,357

Total segment contribution margin		49,408			47,422

Operating activities excluded from segment cost of goods sold		(1,509	)		(1,752	)
Selling, general and administrative		(12,404	)		(9,904	)
Depreciation, depletion and amortization		(8,278	)		(5,978	)
Interest expense		(3,576	)		(3,797	)
Other income, net, including interest income		122			154

Income before income taxes	$	23,763		$	26,145

Asset information, including capital expenditures and depreciation, depletion, and amortization, by segment is not included in reports used by management in its monitoring of performance and, therefore, is not reported by segment. As of March 31, 2013 and December 31, 2012, goodwill of $68.4 million has been allocated to these segments with $47.7 million assigned to Oil & Gas Proppants and $20.7 million to Industrial and Specialty Products.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	NOTE U—SUBSEQUENT EVENTS On April 29, 2013, the Company’s board of directors declared a quarterly cash dividend of $0.125 per share to common shareholders of record at the close of business on June 19, 2013, payable on July 3, 2013.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2013
Accounting Policies [Abstract]
Basis of Presentation	*Basis of Presentation* The consolidated financial statements as of and for the three months ended March 31, 2013 and 2012 (the “Financial Statements”), present our financial position, results of operations, and cash flows. In consideration of the contribution of GGC RCS Holdings, Inc. to us on January 31, 2012, we and our subsidiaries are presented on a consolidated basis with GGC RCS Holdings, Inc. as of and for the three months ended March 31, 2013 and 2012 and as of the year ended December 31, 2012. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”). Although we believe our disclosures are adequate to make the information presented not misleading, you should read the Financial Statements in this report in conjunction with the combined financial statements and notes to those financial statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012, as filed with the Securities and Exchange Commission (“SEC”) on February 26, 2013 (our “2012 Annual Report”). Certain terms not otherwise defined in this Quarterly Report on Form 10-Q, have the meanings specified in our 2012 Annual Report. In our opinion, our Financial Statements reflect all normal and recurring adjustments necessary to present fairly our financial position as of March 31, 2013, and December 31, 2012, the results of our operations for the three months ended March 31, 2013 and 2012, and our cash flows for the three months ended March 31, 2013 and 2012. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial Statements. We follow Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) guidance for identification and reporting of entities over which control is achieved through means other than voting rights. The guidance defines such entities as Variable Interest Entities (“VIEs”). As of March 31, 2013 and for the periods presented herein, we have identified no entities over which we maintain any level of control that would qualify for consolidation under ASC guidance. In order to make this report easier to read, we refer throughout to (i) our Consolidated Balance Sheets as our “Balance Sheets,” and (ii) our Consolidated Statements of Operations as our “Income Statements,” and (iii) our Consolidated Statements of Cash Flows as our “Cash Flows.”
Use of Estimates	*Use of Estimates* The preparation of the Financial Statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of fair value for certain reporting units and asset impairments (including impairments of goodwill and other long-lived assets); write-downs of inventory to net realizable value; post-employment, post-retirement and other employee benefit liabilities; valuation allowances for deferred tax assets; reserves for contingencies and litigation; and the fair value and accounting treatment of financial instruments including derivative instruments. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions.
Unaudited Interim Financial Statements	*Unaudited Interim Financial Statements* The accompanying Balance Sheet as of March 31, 2013, the Income Statements for the three months ended March 31, 2013 and 2012; the Consolidated Statements of Comprehensive Income for the three months ended March 31, 2013 and 2012; the Consolidated Statements of Cash Flows for the three months ended March 31, 2013 and 2012; and other information disclosed in the related notes, are unaudited. The Balance Sheet as of December 31, 2012 was derived from our audited consolidated financial statements as included in our 2012 Annual Report. The accompanying Financial Statements should be read in conjunction with the audited combined financial statements and related notes contained in our 2012 Annual Report.
Recently Adopted Accounting Pronouncements	*Recently Adopted Accounting Pronouncements* In May 2011, the Financial Accounting Standards Board (“FASB”) issued changes to conform existing guidance regarding fair value measurement and disclosure between GAAP and International Financial Reporting Standards. These changes both clarify the FASB’s intent about the application of existing fair value measurement and disclosure requirements and amend certain principles or requirements for measuring fair value or for disclosing information about fair value measurements. The clarifying changes relate to the application of the highest and best use and valuation premise concepts, measuring the fair value of an instrument classified in a reporting entity’s stockholders’ equity, and disclosure of quantitative information about unobservable inputs used for Level 3 fair value measurements. The amendments relate to measuring the fair value of financial instruments that are managed within a portfolio; application of premiums and discounts in a fair value measurement; and additional disclosures concerning the valuation processes used and sensitivity of the fair value measurement to changes in unobservable inputs for those items categorized as Level 3, a reporting entity’s use of a nonfinancial asset in a way that differs from the asset’s highest and best use, and the categorization by level in the fair value hierarchy for items required to be measured at fair value for disclosure purposes only. We adopted this guidance, effective January 1, 2012, with no material impact on our Financial Statements. In June 2011, the FASB issued changes to the presentation of comprehensive income. These changes give an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements; the option to present components of other comprehensive income as part of the statement of changes in stockholders’ equity was eliminated. The items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income were not changed. Additionally, no changes were made to the calculation and presentation of earnings per share. We adopted this guidance, effective January 1, 2012, with no material impact on our Financial Statements. In September 2011, the FASB issued changes to the testing of goodwill for impairment. These changes provide an entity the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (more than 50%) that the fair value of a reporting unit is less than its carrying amount. Such qualitative factors may include the following: macroeconomic conditions; industry and market considerations; cost factors; overall financial performance; and other relevant entity-specific events. If an entity elects to perform a qualitative assessment and determines that an impairment is more likely than not, the entity is then required to perform the existing two-step quantitative impairment test, otherwise no further analysis is required. An entity also may elect not to perform the qualitative assessment and, instead, go directly to the two-step quantitative impairment test. We adopted this guidance, effective January 1, 2012 with no material impact on our Financial Statements. In September 2011, the FASB issued changes to increase the level of disclosure about an employer’s participation in a multiemployer pension plan. These changes require that employers provide additional separate quantitative and qualitative disclosures for multiemployer pension plans and multiemployer other post-retirement benefit plans, including the significant multiemployer plan(s) in which an employer participates, the level at which an employer participates in the plan(s), the financial health of the plan(s) and the nature of the employer commitments to the plan(s). We adopted this guidance, effective January 1, 2012 with no material impact on our Financial Statements. In July 2012, the FASB issued changes to the testing of indefinite-lived intangible assets for impairment. These changes provide an entity the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (more than 50%) that the fair value of an indefinite-lived intangible asset is less than its carrying amount. In accordance with the amendment, an entity has the option first to assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the indefinite-lived intangible asset is impaired. In conducting a qualitative assessment, an entity should consider the extent to which relevant events and circumstances, both individually and in the aggregate, could have affected the significant inputs used to determine the fair value of the indefinite-lived intangible asset since the last assessment. If, after assessing the totality of events and circumstances, an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount. An entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test. An entity will be able to resume performing the qualitative assessment in any subsequent period. We adopted this guidance, effective for the 2012 reporting period with no material impact on our Financial Statements. In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (ASC Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” which requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, entities are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, entities are required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail on these amounts. We adopted this guidance, effective for the 2013 reporting period with no material impact on our Financial Statements.

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share


	Three Months Ended March 31,
	2013		2012
Net income available for stockholders:	$	17,277	$	19,113
Less dividends paid:
Common stock		—		—
Restricted shares of common stock		—		—

Undistributed earnings	$	17,277	$	19,113


Allocation of undistributed earnings:
Common stock		17,251		19,113
Restricted shares of common stock		26		—

Basic shares outstanding:
Common stock		52,866		51,939
Restricted shares of common stock		80		—

		52,946		51,939


Diluted shares outstanding:
Common stock		52,866		51,939
Dilutive effect of options		265		—

		53,131		51,939
Restricted shares of common stock		80		—

		53,211		51,939


Basic earnings per share:
Common stock:
Distributed earnings	$	—	$	—
Undistributed earnings		0.33		0.37

	$	0.33	$	0.37


Restricted shares of common stock:
Distributed earnings	$	—	$	—
Undistributed earnings		0.33		—

	$	0.33	$	—


Diluted earnings per share:
Common stock
Distributed earnings	$	—	$	—
Undistributed earnings		0.32		0.37

	$	0.32	$	0.37

Capital Structure and Accumulated Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Schedule of Stockholders' Equity

The following table presents the activity included in stockholders’ equity during the three months ended March 31, 2013.


	Common Stock		Treasury Stock			Additional Paid-In Capital		Retained Earnings (Deficit)		Accumulated Other Comprehensive Income (Loss)			Total Stockholders’ Equity
Balance at December 31, 2012	$	529	$	(970	)	$	163,579	$	82,731	$	(14,175	)	$	231,694
Net Income		—		—			—		17,277		—			17,277
Unrealized loss on derivatives		—		—			—		—		81			81
Minimum pension liability		—		—			—		—		341			341
Proceeds from options exercised		—		606			182		—		—			788
Equity-based compensation		—		—			678		—		—			678
Excess tax benefit from equity-based compensation		—		—			96		—		—			96

Balance at March 31, 2013	$	529	$	(364	)	$	164,535	$	100,008	$	(13,753	)	$	250,955

Changes in Accumulated Other Comprehensive Income

The following table presents the changes in accumulated other comprehensive income by component during the three months ended March 31, 2013:


	For the Quarter Ended March 31, 2013
	Unrealized loss on derivatives			Pension and other postretirement benefits liability			Total
Beginning Balance	$	(183	)	$	(13,992	)	$	(14,175	)
Other comprehensive income before reclassifications		—			—			—
Amounts reclassed from accumulated other comprehensive income		81			341			422

Ending Balance	$	(102	)	$	(13,651	)	$	(13,753	)

Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

The following table presents the reclassifications out of accumulated other comprehensive income (loss) during the three months ended March 31, 2013:


Details about accumulated other comprehensive income	Amount reclassified from accumulated other comprehensive income			Affected line item in the statement of operations
Gains and losses on derivatives
Interest rate contracts	$	133		Interest expense
		(52	)	Tax expense

	$	81		Net of tax

Amortization of postretirement benefits liability
Actuarial gains/(losses)	$	536		⁽¹⁾
Prior service cost		23		⁽¹⁾

	$	559		Total before tax
		(218	)	Tax expense

		341		Net of tax

Total reclassifications for the period	$	(422	)	Net of tax

⁽¹⁾	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see note Q).

Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Schedule of Accounts Receivable

At March 31, 2013 and December 31 2012, accounts receivable consisted of the following:


	March 31, 2013			December 31, 2012
Trade receivables	$	62,710		$	56,519
Less: Allowance for doubtful accounts		(1,056	)		(1,053	)

Net trade receivables		61,654			55,466
Other receivables		3,595			4,098

Total accounts receivable	$	65,249		$	59,564

Schedule of Allowance for Doubtful Accounts

Changes in our allowance for doubtful accounts during the three months ended March 31, 2013 are as follows:


	Allowance for Doubtful Accounts
Beginning balance	$	(1,053	)
Bad debt provision		—
Accounts recovered		(3	)

Ending balance	$	(1,056	)

Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of Inventories

At March 31, 2013 and December 31, 2012, inventories consisted of the following:


	March 31, 2013		December 31, 2012
Supplies	$	14,298	$	13,472
Raw materials and work in process		8,544		10,720
Finished goods		19,934		15,643

Total inventories	$	42,776	$	39,835

Property, Plant and Mine Development (Tables)

3 Months Ended

Mar. 31, 2013

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Mine Development

At March 31, 2013 property, plant and mine development consisted of the following:


	As of March 31, 2013
	Cost		Accumulated Depreciation/ Amortization			Net Book Value
Mining property and mine development	$	163,538	$	(16,835	)	$	146,703
Asset retirement cost		5,124		(661	)		4,463
Land		25,824		—			25,824
Land improvements		29,366		(4,743	)		24,623
Buildings		33,221		(4,892	)		28,329
Machinery and equipment		235,294		(59,201	)		176,093
Furniture and fixtures		945		(171	)		774

		493,312		(86,503	)		406,809
Construction-in-progress		22,802		—			22,802

	$	516,114	$	(86,503	)	$	429,611

At December 31, 2012 property, plant and mine development consisted of the following:


	As of December 31, 2012
	Cost		Accumulated Depreciation/ Amortization			Net Book Value
Mining property and mine development	$	163,538	$	(15,778	)	$	147,760
Asset retirement cost		5,124		(597	)		4,527
Land		24,795		—			24,795
Land improvements		27,604		(4,034	)		23,570
Buildings		31,558		(4,354	)		27,204
Machinery and equipment		221,139		(53,599	)		167,540
Furniture and fixtures		915		(142	)		773

		474,673		(78,504	)		396,169
Construction-in-progress		18,049		—			18,049

	$	492,722	$	(78,504	)	$	414,218

Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Schedule of Accrued Liabilities

At March 31, 2013 and December 31, 2012, accrued liabilities consisted of the following:


	March 31, 2013		December 31, 2012
Accrued salaries and wages	$	1,926	$	2,939
Accrued vacation liability		2,355		2,397
Current portion of liability for pension and post-retirement benefits		1,627		1,413
Accrued healthcare liability		1,316		1,278
Other accrued liabilities		2,856		1,454

Total accrued liabilities	$	10,080	$	9,481

Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Schedule of Debt

At March 31, 2013 and December 31, 2012, debt consisted of the following:


	March 31, 2013			December 31, 2012
Revolving line-of-credit: (expires October 31, 2016) (5.0% at March 31, 2013 and December 31, 2012)	$	10,551		$	—
Senior secured credit facility:
Term loan facility (final maturity June 8, 2017) (4.75% at March 31, 2013 and December 31, 2012), net of unamortized original issue discount of $633 and $675, respectively		254,817			255,425

Total debt		265,368			255,425
Less: current portion		(12,985	)		(2,433	)

Total long-term portion of debt	$	252,383		$	252,992

Schedule of Contractual Maturities of Debt

As of March 31, 2013, contractual maturities of our debt are as follows:


2013	$	12,376
2014		2,435
2015		2,436
2016		124,648
2017		123,473
Thereafter		—

	$	265,368

Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligation

Changes in the asset retirement obligation during the three month period ended March 31, 2013 and the year ended December 31, 2012 are as follows:


	March 31, 2013		December 31, 2012 ⁽¹⁾
Beginning balance	$	6,659	$	9,504
Liabilities settled/payments		—		—
Accretion expense		114		658
Additions, revisions of prior estimates and other		—		(3,503	)

Ending balance	$	6,773	$	6,659

⁽¹⁾	Represents change in the asset retirement obligation during the 12-month period ended December 31, 2012.

Fair Value Accounting (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of Measure at Fair Value on Recurring Basis

In accordance with the fair value hierarchy, the following table presents the fair value as of March 31, 2013, of those derivative assets that we must measure at fair value on a recurring basis:

Level 1

Level 2

Level 3

Total

Interest rate derivatives

—

Net asset

—

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Estimated Fair Values of Derivative Instruments


		March 31, 2013						December 31, 2012
	Maturity Date	Contract/Notional Amount		Carrying Amount		Fair Value		Contract/Notional Amount		Carrying Amount		Fair Value

Interest rate cap agreement⁽¹⁾	2013	$	130 million	$	—	$	—	$	130 million	$	—	$	—

⁽¹⁾	Agreements limit the LIBOR floating interest rate base to 4%.

Effect of Derivatives Instruments on Combined Statements of Operations and Comprehensive Income


	Three Months Ended March 31,
	2013			2012
Deferred losses from derivatives in OCI, beginning of period	$	(183	)	$	(409	)
Gain (loss) recognized in OCI from derivative instruments		—			(7	)
Gain (loss) reclassified from Accumulated OCI into income		81			—

Deferred losses from derivatives in OCI, end of period	$	(102	)	$	(416	)

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Leases (Tables)

3 Months Ended

Mar. 31, 2013

Leases [Abstract]

Future Minimum Annual Commitments under Operating Leases

Future minimum annual commitments under such operating leases at March 31, 2013 are as follows:


2013		10,969
2014		8,357
2015		7,617
2016		5,980
2017		4,138
Thereafter		5,696

Total future lease commitments	$	42,757

Pension and Post-Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Summarizes Information about Pension and Post-Retirement Benefit Plans

Net periodic pension benefit cost recognized for the three months ended March 31, 2013 and 2012 are as follows:


	Three Months Ended March 31,
	2013			2012
Service cost	$	320		$	275
Interest cost		1,049			1,160
Expected return on plan assets		(1,265	)		(1,301	)
Amortization of prior service cost		21			2
Amortization of net (gain) loss		455			353

Net periodic benefit cost	$	580		$	489

Net periodic post-retirement benefit cost recognized for the three months ended March 31, 2013 and 2012 are as follows:


	Three Months Ended March 31,
	2013			2012
Service cost	$	58		$	58
Interest cost		253			296
Expected return on plan assets		(1	)		(1	)
Amortization of net (gain) loss		74			95

Net periodic benefit cost	$	384		$	448

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results


	Three Months Ended March 31,
	2013			2012
Sales:
Oil and Gas Proppants	$	73,582		$	53,810
Industrial and Specialty Products		48,729			48,781

Total sales		122,311			102,591
Segment contribution margin:
Oil and Gas Proppants		36,162			35,065
Industrial and Specialty Products		13,246			12,357

Total segment contribution margin		49,408			47,422

Operating activities excluded from segment cost of goods sold		(1,509	)		(1,752	)
Selling, general and administrative		(12,404	)		(9,904	)
Depreciation, depletion and amortization		(8,278	)		(5,978	)
Interest expense		(3,576	)		(3,797	)
Other income, net, including interest income		122			154

Income before income taxes	$	23,763		$	26,145

Organization - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended
	Feb. 06, 2012	Jan. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jul. 08, 2011	Nov. 25, 2008
Organization And Nature Of Business [Line Items]
Common stock authorized		2,941,176	500,000,000		100,000,000
Common stock issued	2,941,176	2,941,176	52,987,227	52,941,176		1,000
Stockholders common stock issued	8,823,529	8,823,529
Common stock, offering price	$ 17.00	$ 17.00
Aggregate offering price at common stock	$ 50.0	$ 50.0
Underwriting discounts and commissions			$ 3.5
Offering expenses			5.7
Net proceeds			40.8
Aggregate offering price at stockholders common stock	$ 150.0
Accrued interest		1.7	$ 1.7
Convertible note payable [Member]
Organization And Nature Of Business [Line Items]
GGC RCS Holdings, Inc.-note payable converted to equity contribution		$ 15.0

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013
Accounting Policies [Abstract]
Percentage of fair value of reporting unit less than carrying amount	50.00%

Earnings Per Share - Additional Information (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 06, 2012	Jan. 31, 2012	Jul. 08, 2011	Nov. 25, 2008
Earnings Per Share [Abstract]
Common stock issued	52,987,227	52,941,176	2,941,176	2,941,176		1,000
Aggregate purchase price						$ 10.00
Increase in common stock shares authorized	500,000,000			2,941,176	100,000,000
Description of split of company common stock	The amended and restated certificate of incorporation also created a 50,000-for-one split of our common stock.

Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Line Items]
Net income available for stockholders:	$ 17,277	$ 19,113
Less dividends paid:
Undistributed earnings	17,277	19,113
Allocation of undistributed earnings:
Undistributed earnings	$ 17,277	$ 19,113
Basic shares outstanding:
Basic shares outstanding	52,946	51,939
Diluted shares outstanding:
Basic shares outstanding	52,946	51,939
Dilutive effect of options	265
Diluted shares outstanding	53,211	51,939
Basic earnings per share:
Diluted earnings per share	$ 0.32	$ 0.37
Basic earnings per share	0.33	0.37
Restricted shares of common stock:
Basic earnings per share	$ 0.33	$ 0.37
Common Stock [Member]
Earnings Per Share [Line Items]
Net income available for stockholders:
Less dividends paid:
Dividends paid
Undistributed earnings	17,251	19,113
Allocation of undistributed earnings:
Undistributed earnings	$ 17,251	$ 19,113
Basic shares outstanding:
Basic shares outstanding	52,866	51,939
Diluted shares outstanding:
Basic shares outstanding	52,866	51,939
Diluted shares outstanding	53,131	51,939
Basic earnings per share:
Diluted earnings per share, distributed
Diluted earnings per share, undistributed	0.32	0.37
Diluted earnings per share	0.32	0.37
Basic earnings per share, distributed
Basic earnings per share, undistributed	0.33	0.37
Basic earnings per share	0.33	0.37
Restricted shares of common stock:
Basic earnings per share, distributed
Basic earnings per share, undistributed	0.33	0.37
Basic earnings per share	$ 0.33	$ 0.37
Restricted Stock [Member]
Less dividends paid:
Dividends paid
Undistributed earnings	26
Allocation of undistributed earnings:
Undistributed earnings	$ 26
Basic shares outstanding:
Basic shares outstanding	80
Diluted shares outstanding:
Basic shares outstanding	80
Basic earnings per share:
Basic earnings per share, distributed
Basic earnings per share, undistributed	0.33
Basic earnings per share	0.33
Restricted shares of common stock:
Basic earnings per share, distributed
Basic earnings per share, undistributed	0.33
Basic earnings per share	$ 0.33

Capital Structure and Accumulated Comprehensive Income - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended
	Apr. 29, 2013	Mar. 31, 2013	Jan. 31, 2012	Mar. 31, 2013	Jun. 11, 2012	Mar. 31, 2012	Feb. 06, 2012	Jul. 08, 2011	Nov. 25, 2008
Comprehensive Income And Equity [Line Items]
Common stock authorized, shares		500,000,000	2,941,176	500,000,000				100,000,000
Common stock, par value		$ 0.01		$ 0.01
Common stock issued		52,987,227	2,941,176	52,987,227		52,941,176	2,941,176		1,000
Common stock, shares outstanding		52,987,227		52,987,227		52,941,176
Preferred stock, shares authorized		10,000,000		10,000,000
Preferred stock, par value		$ 0.01		$ 0.01
Preferred stock issued		0		0		0
Preferred stock, shares outstanding		0		0		0
Common stock, offering price			$ 17.00				$ 17.00
Aggregate offering price at common stock			$ 50.0				$ 50.0
Net proceeds				$ 40.8
Offering expenses				5.7
Underwriting discounts and commissions				3.5
Accrued interest			$ 1.7	1.7
Subsequent Event [Member]
Comprehensive Income And Equity [Line Items]
Quarterly cash dividend declared	$ 0.125
Dividend declared date	Apr. 29, 2013
Dividend declared, record date	Jun. 19, 2013
Dividend declared, payable date	Jul. 03, 2013
Common Stock [Member]
Comprehensive Income And Equity [Line Items]
Common stock repurchased				$ 25.0
Common stock repurchase authorization period				18 months
Common stock repurchase authorization period, conclusion date					Dec. 11, 2013
Number of repurchased shares, common stock		100,000
Repurchased common stock, average price		$ 10.72
Authorization to repurchase common stock		$ 23.9		$ 23.9
Shares re-issued to satisfy employee option exercises				66,051
Treasury shares		33,949		33,949
Convertible note payable [Member]
Comprehensive Income And Equity [Line Items]
GGC RCS Holdings, Inc.- note payable to GGC USS Holdings				$ 15.0

Capital Structure and Accumulated Comprehensive Income - Schedule of Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Shareholders Equity [Line Items]
Beginning balance	$ 231,694
Net income	17,277	$ 19,113
Unrealized loss on derivatives	81
Minimum pension liability	341
Proceeds from options exercised	788
Equity-based compensation	678
Excess tax benefit from equity-based compensation	96
Ending balance	250,955
Common Stock [Member]
Shareholders Equity [Line Items]
Beginning balance	529
Net income
Unrealized loss on derivatives
Minimum pension liability
Proceeds from options exercised
Equity-based compensation
Excess tax benefit from equity-based compensation
Ending balance	529
Treasury Stock [Member]
Shareholders Equity [Line Items]
Beginning balance	(970)
Net income
Unrealized loss on derivatives
Minimum pension liability
Proceeds from options exercised	606
Equity-based compensation
Excess tax benefit from equity-based compensation
Ending balance	(364)
Additional Paid-In Capital [Member]
Shareholders Equity [Line Items]
Beginning balance	163,579
Net income
Unrealized loss on derivatives
Minimum pension liability
Proceeds from options exercised	182
Equity-based compensation	678
Excess tax benefit from equity-based compensation	96
Ending balance	164,535
Retained Earnings (Deficit) [Member]
Shareholders Equity [Line Items]
Beginning balance	82,731
Net income	17,277
Unrealized loss on derivatives
Minimum pension liability
Proceeds from options exercised
Equity-based compensation
Excess tax benefit from equity-based compensation
Ending balance	100,008
Accumulated Other Comprehensive Income (Loss) [Member]
Shareholders Equity [Line Items]
Beginning balance	(14,175)
Net income
Unrealized loss on derivatives	81
Minimum pension liability	341
Proceeds from options exercised
Equity-based compensation
Excess tax benefit from equity-based compensation
Ending balance	$ (13,753)

Capital Structure and Accumulated Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($)
Accumulated Comprehensive Income Loss [Line Items]
Beginning Balance	$ (14,175)
Other comprehensive income before reclassifications
Amounts reclassed from accumulated other comprehensive income	422
Ending Balance	(13,753)
Unrealized loss on derivatives [Member]
Accumulated Comprehensive Income Loss [Line Items]
Beginning Balance	(183)
Other comprehensive income before reclassifications
Amounts reclassed from accumulated other comprehensive income	81
Ending Balance	(102)
Pension and other postretirement benefits liability [Member]
Accumulated Comprehensive Income Loss [Line Items]
Beginning Balance	(13,992)
Other comprehensive income before reclassifications
Amounts reclassed from accumulated other comprehensive income	341
Ending Balance	$ (13,651)

Capital Structure and Accumulated Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (3,576)	$ (3,797)
Tax expense	(6,486)	$ (7,032)
Amounts reclassed from accumulated other comprehensive income	(422)
Amortization of postretirement benefits liability [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial gains/(losses)	536
Prior service cost	23
Total before tax	559
Tax expense	(218)
Net of tax	341
Gains and losses on derivatives [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	133
Tax expense	(52)
Net of tax	$ 81

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Trade receivables	$ 62,710	$ 56,519
Less: Allowance for doubtful accounts	(1,056)	(1,053)
Net trade receivables	61,654	55,466
Other receivables	3,595	4,098
Total accounts receivable	$ 65,249	$ 59,564

Accounts Receivable - Schedule of Allowance for Doubtful Accounts (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($)
Receivables [Abstract]
Beginning balance	$ (1,053)
Bad debt provision
Accounts recovered	(3)
Ending balance	$ (1,056)

Accounts Receivable - Additional Information (Detail) - Customer	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Five largest customers [Member]
Revenue, Major Customer [Line Items]
Number of customers accounted for sales percentage	5	5
Percentage of sales accounted by five largest customers	23.00%	26.00%
No single individual customer [Member]
Revenue, Major Customer [Line Items]
Maximum percentage of sales accounted by an individual customer	10.00%	10.00%

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Supplies	$ 14,298	$ 13,472
Raw materials and work in process	8,544	10,720
Finished goods	19,934	15,643
Total inventories	$ 42,776	$ 39,835

Property, Plant and Mine Development - Schedule of Property, Plant and Mine Development (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Cost	$ 516,114	$ 492,722
Accumulated Depreciation/Amortization	(86,503)	(78,504)
Net Book Value	429,611	414,218
Mining property and mine development [Member]
Property, Plant and Equipment [Line Items]
Cost	163,538	163,538
Accumulated Depreciation/Amortization	(16,835)	(15,778)
Net Book Value	146,703	147,760
Asset retirement cost [Member]
Property, Plant and Equipment [Line Items]
Cost	5,124	5,124
Accumulated Depreciation/Amortization	(661)	(597)
Net Book Value	4,463	4,527
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	25,824	24,795
Accumulated Depreciation/Amortization
Net Book Value	25,824	24,795
Land improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	29,366	27,604
Accumulated Depreciation/Amortization	(4,743)	(4,034)
Net Book Value	24,623	23,570
Buildings [Member]
Property, Plant and Equipment [Line Items]
Cost	33,221	31,558
Accumulated Depreciation/Amortization	(4,892)	(4,354)
Net Book Value	28,329	27,204
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	235,294	221,139
Accumulated Depreciation/Amortization	(59,201)	(53,599)
Net Book Value	176,093	167,540
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Cost	945	915
Accumulated Depreciation/Amortization	(171)	(142)
Net Book Value	774	773
Property, Plant and Mine Development [Member]
Property, Plant and Equipment [Line Items]
Cost	493,312	474,673
Accumulated Depreciation/Amortization	(86,503)	(78,504)
Net Book Value	406,809	396,169
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Cost	22,802	18,049
Accumulated Depreciation/Amortization
Net Book Value	$ 22,802	$ 18,049

Property, Plant and Mine Development - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Leases [Abstract]
Depreciation, depletion and amortization expense, excluding accretion	$ 8,278	$ 5,978
Property, plant and equipment interest capitalization	128	$ 65
Capital lease obligation	$ 744

Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued salaries and wages	$ 1,926	$ 2,939
Accrued vacation liability	2,355	2,397
Current portion of liability for pension and post-retirement benefits	1,627	1,413
Accrued healthcare liability	1,316	1,278
Other accrued liabilities	2,856	1,454
Total accrued liabilities	$ 10,080	$ 9,481

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for unused vacation time owed to employees based on the entity's vacation benefit given to its employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

The current liability recognized in the balance sheet that is associated with defined benefit pension plans and other postretirement and postemployment benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Total debt	$ 265,368	$ 255,425
Less: current portion	(2,434)	(2,433)
Total long-term portion of debt	252,383	252,992
Revolving line-of-credit [Member]
Line of Credit Facility [Line Items]
Line of credit available	10,551
Senior secured credit facility [Member]
Line of Credit Facility [Line Items]
Line of credit available	$ 254,817	$ 255,425

Debt - Schedule of Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Revolving line-of-credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maturity date	Oct. 31, 2016
Credit facility, interest rate	5.00%
Senior secured credit facility [Member]
Line of Credit Facility [Line Items]
Credit facility, maturity date	Jun. 08, 2017
Credit facility, interest rate	4.75%	4.75%
Term loan facility unamortized original issue discount	$ 633	$ 675

Debt - Additional Information (Detail) - Revolving line-of-credit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013
Short-term Debt [Line Items]
Available borrowing base		$ 50.0
Amount drawn from borrowing base		10.6
Amount allocated for letters of credit		10.4
Amount available for general corporate use under this revolving credit agreement		$ 29.0
Minimum [Member]
Short-term Debt [Line Items]
Increase of commitment	$ 35.0
Letter of credit sublimit	15.0
Maximum [Member]
Short-term Debt [Line Items]
Increase of commitment	50.0
Letter of credit sublimit	$ 20.0

Debt - Schedule of Contractual Maturities of Debt (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Debt Disclosure [Abstract]
2013	$ 12,376
2014	2,435
2015	2,436
2016	124,648
2017	123,473
Thereafter
Debt, Total	$ 265,368

Asset Retirement Obligations - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligation	$ 6.8	$ 6.7

Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligation (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]
Beginning balance	$ 6,659	$ 9,504
Liabilities settled/payments
Accretion expense	114	658
Additions, revisions of prior estimates and other		(3,503)
Ending balance	$ 6,773	$ 6,659

Fair Value Accounting - Schedule of Measure at Fair Value on Recurring Basis (Detail)	Mar. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Interest rate derivatives
Net asset
Measured at fair value on recurring basis [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest rate derivatives
Net asset
Measured at fair value on recurring basis [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest rate derivatives
Net asset
Measured at fair value on recurring basis [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest rate derivatives
Net asset

Derivative Instruments - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Matured amount	$ 130.0	$ 100.0
Upper limit of LIBOR for one-month	4.00%
Original notional amount	$ 30.0
Increase in notional amount	$ 130.0

Derivative Instruments - Estimated Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Contract/Notional Amount	$ 130.0		$ 100.0
Interest rate cap agreement [Member] \| 2013 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Maturity Date	2013
Contract/Notional Amount	$ 130.0	$ 130.0
Carrying Amount
Fair Value

Derivative Instruments - Estimated Fair Values of Derivative Instruments (Parenthetical) (Detail)	Mar. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Upper limit of LIBOR for one-month	4.00%

Derivative Instruments - Effect of Derivatives Instruments on Combined Statements of Operations and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Deferred losses from derivatives in OCI, beginning of period	$ (183)	$ (409)
Gain (loss) recognized in OCI from derivative instruments		(7)
Gain (loss) reclassified from Accumulated OCI into income	81
Deferred losses from derivatives in OCI, end of period	$ (102)	$ (416)

Equity-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity Program [Member]
Option Indexed to Issuer's Equity [Line Items]
Recognized compensation expense	$ 27	$ 55
Total unrecognized compensation expense	$ 173
Recognized weighted-average period	1 year 7 months 2 days
2011 Plan [Member]
Option Indexed to Issuer's Equity [Line Items]
Recognized compensation expense	$ 651	$ 599
Total unrecognized compensation expense	$ 6,800
Recognized weighted-average period	2 years 11 months 19 days

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Leases - Future Minimum Annual Commitments under Operating Leases (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Leases [Abstract]
2013	$ 10,969
2014	8,357
2015	7,617
2016	5,980
2017	4,138
Thereafter	5,696
Total future lease commitments	$ 42,757

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Leases [Abstract]
Expense related to operating leases and rental agreements	$ 3,300	$ 2,600
Capital lease obligation	$ 489

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

+ References + Details

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($) Claim	Dec. 31, 2012 USD ($)
Insurance [Abstract]
New claims filed \| Claim	0
Products liability claims outstanding \| Claim	93
Underlying insurance policies receivable		$ 5,100
Third-party products claims liability under insurance in other assets	$ 247	247
Third-party products claims liability under insurance in other long-term obligations	$ 1,200	$ 1,300

Pension and Post-Retirement Benefits - Summarizes Information about Pension and Post-Retirement Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 320	$ 275
Interest cost	1,049	1,160
Expected return on plan assets	(1,265)	(1,301)
Amortization of prior service cost	21	2
Amortization of net (gain) loss	455	353
Net periodic benefit cost	580	489
Post-retirement benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	58	58
Interest cost	253	296
Expected return on plan assets	(1)	(1)
Amortization of net (gain) loss	74	95
Net periodic benefit cost	$ 384	$ 448

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Pension and Post-Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to qualified pension plan	$ 0.0	$ 2.2
Employer contributions for the post-retirement medical and life plan	2.3
Post-retirement benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions for the post-retirement medical and life plan	$ 1.3

Obligations Under Guarantees - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($) Vehicle
Kanawha Rail Corporation's [Member]
Loss Contingencies [Line Items]
Number of railroad cars \| Vehicle	199
Payment of monthly rent	$ 66
Surety bonds [Member]
Loss Contingencies [Line Items]
Surety bonds outstanding	4,700
Surety bonds [Member] \| Safeco Insurance Company of America [Member]
Loss Contingencies [Line Items]
Surety bonds outstanding	513
Reclamation bonds [Member]
Loss Contingencies [Line Items]
Bonds related to reclamation requirements	$ 4,600

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 06, 2012	Mar. 31, 2013	Dec. 31, 2012	Jan. 31, 2012	Dec. 31, 2011	Dec. 22, 2010
Related Party Transaction [Line Items]
Termination fee					$ 8,000
Additional expense		$ 0	$ 0
Golden Gate Capital Acquisition [Member]
Related Party Transaction [Line Items]
Advisory fee to parent		$ 1,300
Transaction fee percent		1.25%
Termination of advisory agreement	$ 8,000
Promissory note [Member]
Related Party Transaction [Line Items]
Promissory note with GGC USS Holdings, LLC.						$ 15,000
Promissory note, maturity date		Dec. 22, 2015
Interest rate of promissory note						10.00%
Promissory note, payment terms		Outstanding principal and interest under the note was payable upon demand, but no later than the maturity date. Upon sole election by the parent, any unpaid interest could be paid in cash on December 22 of each year until the maturity date.
Accrued interest				$ 1,700
Conversion of promissory note to equity		$ 15,000

Segment Reporting - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($) Segment Product	Dec. 31, 2012 USD ($)
Operating Statistics [Line Items]
Number of reportable segments \| Segment	2
Number of products in Industrial & Specialty segment \| Product	250
Industrial & Specialty Products segment, description	Over 250 products and materials used in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.
Goodwill	$ 68,403	$ 68,403
Goodwill related segment [Member]
Operating Statistics [Line Items]
Goodwill	68,400	68,400
Oil and Gas Proppants [Member]
Operating Statistics [Line Items]
Goodwill	47,700	47,700
Industrial and Specialty Products [Member]
Operating Statistics [Line Items]
Goodwill	$ 20,700	$ 20,700

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Reporting - Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Total sales	$ 122,311	$ 102,591
Operating activities excluded from segment cost of goods sold	27,217	29,788
Selling, general and administrative	(12,404)	(9,904)
Depreciation, depletion and amortization	(8,278)	(5,978)
Interest expense	(3,576)	(3,797)
Income before income taxes	23,763	26,145
Reporting segments [Member]
Segment Reporting Information [Line Items]
Total sales	122,311	102,591
Total segment contribution margin	49,408	47,422
Operating activities excluded from segment cost of goods sold	(1,509)	(1,752)
Selling, general and administrative	(12,404)	(9,904)
Depreciation, depletion and amortization	(8,278)	(5,978)
Interest expense	(3,576)	(3,797)
Other income, net, including interest income	122	154
Income before income taxes	23,763	26,145
Reporting segments [Member] \| Oil and Gas Proppants [Member]
Segment Reporting Information [Line Items]
Total sales	73,582	53,810
Total segment contribution margin	36,162	35,065
Reporting segments [Member] \| Industrial and Specialty Products [Member]
Segment Reporting Information [Line Items]
Total sales	48,729	48,781
Total segment contribution margin	$ 13,246	$ 12,357

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]	1 Months Ended
	Apr. 29, 2013 $ / shares
Subsequent Event [Line Items]
Quarterly cash dividend declared	$ 0.125
Dividend declared date	Apr. 29, 2013
Dividend declared, record date	Jun. 19, 2013
Dividend declared, payable date	Jul. 03, 2013