U.S. Silica (SLCA) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 04, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
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	'	53,400,850

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current Assets:	'	'
Cash and cash equivalents	$128,687,000	$61,022,000
Short-term investments	24,986,000	'
Accounts receivable, net	74,661,000	59,564,000
Inventories, net	59,127,000	39,835,000
Prepaid expenses and other current assets	10,826,000	6,738,000
Deferred income tax, net	9,979,000	10,108,000
Income tax deposits	2,629,000	'
Total current assets	310,895,000	177,267,000
Property, plant and mine development, net	437,748,000	414,218,000
Debt issuance costs, net	5,475,000	2,111,000
Goodwill	68,403,000	68,403,000
Trade names	10,436,000	10,436,000
Customer relationships, net	6,223,000	6,531,000
Other assets	9,325,000	7,844,000
Total assets	848,505,000	686,810,000
Current Liabilities:	'	'
Book overdraft	3,651,000	5,390,000
Accounts payable	40,600,000	37,333,000
Dividends payable	6,681,000	'
Accrued liabilities	10,755,000	9,481,000
Accrued interest	45,000	2,000
Current portion of capital lease	266,000	'
Current portion of long-term debt	3,487,000	2,433,000
Income tax payable	'	20,596,000
Current portion of deferred revenue	'	4,855,000
Total current liabilities	65,485,000	80,090,000
Long-term debt	368,835,000	252,992,000
Liability for pension and other post-retirement benefits	50,672,000	52,747,000
Deferred income tax, net	63,433,000	59,111,000
Other long-term obligations	12,434,000	10,176,000
Total liabilities	560,859,000	455,116,000
Commitments and contingencies	'	'
Stockholders' Equity:	'	'
Common stock	533,000	529,000
Preferred stock	'	'
Additional paid-in capital	172,024,000	163,579,000
Retained earnings	128,219,000	82,731,000
Treasury stock, at cost	'	-970,000
Accumulated other comprehensive loss	-13,130,000	-14,175,000
Total stockholders' equity	287,646,000	231,694,000
Total liabilities and stockholders' equity	$848,505,000	$686,810,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Sales	$144,372	$115,885	$396,511	$323,075
Cost of goods sold (excluding depreciation, depletion and amortization)	90,983	69,706	245,692	185,547
Operating expenses	'	'	'	'
Selling, general and administrative	12,800	10,135	35,303	29,757
Depreciation, depletion and amortization	9,152	5,968	26,320	17,920
Total operating expenses	21,952	16,103	61,623	47,677
Operating income	31,437	30,076	89,196	89,851
Other (expense) income	'	'	'	'
Interest expense	-4,144	-3,326	-11,255	-10,551
Early extinguishment of debt	-480	'	-480	'
Other income, net, including interest income	260	348	445	681
Total other (expenses) income	-4,364	-2,978	-11,290	-9,870
Income before income taxes	27,073	27,098	77,906	79,981
Income tax expense	-5,739	-8,302	-19,103	-22,621
Net income	$21,334	$18,796	$58,803	$57,360
Earnings per share:	'	'	'	'
Basic	$0.40	$0.36	$1.11	$1.09
Diluted	$0.40	$0.36	$1.10	$1.09

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$21,334	$18,796	$58,803	$57,360
Other comprehensive income:	'	'	'	'
Unrealized gain (loss) on derivatives (net of tax of $(71) and $83 for the three months ended September 30, 2013 and 2012, respectively, and $81 and $108 for the nine months ended September 30, 2013 and 2012, respectively)	-111	2	127	163
Unrealized gain (loss) on investments (net of tax of $(4) and $0 for the three and nine months ended September 30, 2013 and 2012, respectively)	-10	'	-10	'
Pension and other post-retirement benefits liability adjustment (net of tax of $157 and $88 for the three months ended September 30, 2013 and 2012, respectively, and $591 and $381 for the nine months ended September 30, 2013 and 2012, respectively)	246	137	928	598
Other comprehensive income, net of tax	125	139	1,045	761
Comprehensive income	$21,459	$18,935	$59,848	$58,121

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Tax expense on unrealized gain (loss) on derivatives	($71)	$83	$81	$108
Tax expense on unrealized gain (loss) on investments	-4	0	-4	0
Tax expenses on pension and other post-retirement benefits liability adjustment	$157	$88	$591	$381

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'
Net income	$58,803	$57,360
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	26,320	17,920
Debt issuance amortization	461	381
Original issue discount amortization	144	126
Early extinguishment of debt	480	'
Deferred income taxes	4,452	5,734
(Gain)/loss on disposal of property, plant and equipment	-2	-469
Deferred revenue	-4,855	-5,457
Equity-based compensation	2,236	1,662
Excess tax benefit from equity-based compensation	-823	'
Other	-319	437
Changes in assets and liabilities:	'	'
Accounts receivable	-15,097	-13,102
Inventories	-19,292	-6,921
Prepaid expenses and other current assets	-4,088	-38
Income taxes	-22,402	14,092
Accounts payable and accrued liabilities	4,541	10,559
Advisory services termination fee to holding company	'	-8,000
Accrued interest	43	153
Liability for pension and other post-retirement benefits	-2,075	-4,448
Net cash provided by operating activities	28,527	69,989
Investing activities:	'	'
Capital expenditures	-46,835	-74,868
Purchase of short term investments	-25,000	'
Proceeds from sale of property, plant and equipment	167	1,255
Net cash used in investing activities	-71,668	-73,613
Financing activities:	'	'
Proceeds from issuance of common stock in initial public offering	'	50,000
Dividends paid	-6,634	'
Repurchase of common stock	'	-1,072
Issuance of treasury stock	'	22
Proceeds from options exercised	6,505	'
Excess tax benefit from equity-based compensation	823	'
Vesting of restricted stock	-145	'
Increase in long-term debt	373,791	'
Repayment of long-term debt	-257,016	-1,950
Change in book overdraft	-1,739	910
Prepayment penalties	-250	'
Principal payments on capital lease obligations	-478	'
Financing fees	-4,051	-1,304
Common stock issuance costs	'	-9,171
Net cash provided by financing activities	110,806	37,435
Net increase/(decrease) in cash and cash equivalents	67,665	33,811
Cash and cash equivalents, beginning of period	61,022	59,199
Cash and cash equivalents, end of period	128,687	93,010
Non-cash investing and 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	10,774	9,339
Taxes	$37,719	$3,253

Organization

Organization	9 Months Ended
	Sep. 30, 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 November 25, 2008, we issued 1,000 shares of our common stock to our then sole stockholder, GGC Holdings, for an aggregate purchase price of $10.00. The shares were issued in reliance on Section 4(2) of the Securities Act because 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.
	On January 31, 2012, the Certificate of Incorporation was amended and restated to increase the authorized shares of common stock to 500 million shares, and to authorize 10 million shares of preferred stock.
	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 (“GGC Holdings”), 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 Holdings which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC Holdings, simultaneously with the IPO. Coated Sand Solutions, LLC owns facilities to produce resin-coated sand.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 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 and nine months ended September 30, 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 September 30, 2013, and December 31, 2012, the results of our operations for the three and nine months ended September 30, 2013 and 2012, and our cash flows for the nine months ended September 30, 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 September 30, 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 Condensed Consolidated Balance Sheets as our “Balance Sheets,” (ii) our Condensed Consolidated Statements of Operations as our “Income Statements,” and (iii) our Condensed Consolidated Statements of Cash Flows as our “Cash Flows.”
	Unaudited Interim Financial Statements
	The accompanying Balance Sheet as of September 30, 2013, the Income Statements for the three and nine months ended September 30, 2013 and 2012; the Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2013 and 2012; the Consolidated Statements of Cash Flows for the nine months ended September 30, 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.
	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.
	Recently Adopted Accounting Pronouncements
	In May 2011, the 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.
	In July 2013, the FASB amended Accounting Standards Codification (“ASC Topic 740”), “Income Taxes.” The amendment provides guidance on the financial statement presentation of an unrecognized tax benefit, as either a reduction of a deferred tax asset or as a liability, when a net operating loss carry-forward, a similar tax loss or a tax credit carry-forward exists. The amendment will be effective for interim and annual periods beginning after December 15, 2013 and may be applied on a retrospective basis. Early adoption is permitted. We do not expect the adoption of this amendment to have a significant effect on our consolidated financial position or results of operations.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	NOTE C—EARNINGS PER SHARE
	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. The weighted average outstanding stock options excluded were (in thousands) 193 and 169 for the three and nine months ended September 30, 2013, respectively, and 1,384 and 998 for the three and nine months ended September 30, 2012.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013			2012
	Net income	$	21,334		$	18,796	$	58,803		$	57,360
	Less: net income allocated to outstanding restricted stockholders		(74	)		—		(116	)		—
	Net income allocated to common stockholders	$	21,260		$	18,796	$	58,687		$	57,360
	Weighted-average common stock
	Outstanding		53,103			52,873		52,963			52,585
	Outstanding assuming dilution		53,429			52,887		53,263			52,628

Capital_Structure_and_Accumula

Capital Structure and Accumulated Comprehensive Income	9 Months Ended
	Sep. 30, 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 53,384,264 shares of common stock issued and outstanding at September 30, 2013. As of September 30, 2012, there were 52,843,176 shares issued and outstanding. On July 29, 2013, our Board of Directors declared a quarterly cash dividend of $0.125 per share to common stockholders of record at the close of business on September 19, 2013, payable on October 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 September 30, 2013 and 2012. At present, we have no plans to issue any preferred stock.
	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 part of the program, as of September 30, 2013, we have repurchased 100,000 shares of our common stock at an average price of $10.72 and are authorized to repurchase up to an additional $23.9 million of our common stock. As of September 30, 2013, all of the 100,000 shares repurchased to date have been re-issued to satisfy employee option exercises.
	Stockholders’ Equity
	The following table presents the activity included in stockholders’ equity during the nine months ended September 30, 2013.
			Common			Treasury			Additional			Retained			Accumulated			Total
			Stock			Stock			Paid-In Capital			Earnings			Other			Stockholders’
												(Deficit)			Comprehensive			Equity
															Income (Loss)
	Balance at December 31, 2012		$	529		$	(970	)	$	163,579		$	82,731		$	(14,175	)	$	231,694
	Net Income			—			—			—			58,803			—			58,803
	Other comprehensive income, net of tax			—			—			—			—			1,045			1,045
	Proceeds from options exercised			4			1,115			5,386			—			—			6,505
	Shares withheld to pay taxes due upon vesting of restricted stock			—			(145	)		—			—			—			(145	)
	Cash dividends declared ($0.250 per share of common stock)			—			—			—			(13,315	)		—			(13,315	)
	Equity-based compensation			—			—			2,236			—			—			2,236
	Excess tax benefit from equity-based compensation			—			—			823			—			—			823
	Balance at September 30, 2013		$	533		$	—		$	172,024		$	128,219		$	(13,130	)	$	287,646
	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 nine months ended September 30, 2013:
			For the Nine Months Ended September 30,  2013
			Unrealized			Unrealized			Pension and			Total
			gain/(loss) on			gain/(loss) on			other
			cash flow hedges			short-term			postretirement
						investments			benefits liability
	Beginning Balance		$	(183	)	$	—		$	(13,992	)	$	(14,175	)
	Other comprehensive income (loss) before reclassifications			(57	)		(10	)		—			(67	)
	Amounts reclassed from accumulated other comprehensive income			184			—			928			1,112
	Ending Balance		$	(56	)	$	(10	)	$	(13,064	)	$	(13,130	)
	The following table presents the reclassifications out of accumulated other comprehensive income (loss) during the nine months ended September 30, 2013:
	Details about accumulated other comprehensive income		Amount reclassified from			Affected line item in the
			accumulated other			statement of operations
			comprehensive income
	Gains and losses on cash flow hedges
	Interest rate contracts		$	301		Interest expense
				(117	)	Tax expense
			$	184		Net of tax
	Amortization of postretirement benefits liability
	Actuarial gains/(losses)		$	1,450		-1
	Prior service cost			69		-1
			$	1,519		Total before tax
				(591	)	Tax expense
				928		Net of tax
	Total reclassifications for the period		$	1,112		Net of tax
	(1)	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see note R).

Accounts_Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Accounts Receivable	'
	NOTE E—ACCOUNTS RECEIVABLE
	At September 30, 2013 and December 31, 2012, accounts receivable consisted of the following:
		September 30,			December 31,
		2013			2012
	Trade receivables	$	75,588		$	56,519
	Less: Allowance for doubtful accounts		(1,056	)		(1,053	)
	Net trade receivables		74,532			55,466
	Other receivables		129			4,098
	Total accounts receivable	$	74,661		$	59,564
	Our five largest customers accounted for approximately 32% and 29% of sales in the nine months ended September 30, 2013 and 2012, respectively. No single individual customer accounted for more than 10% of sales in the nine months ended September 30, 2013 and 2012.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	NOTE F—INVENTORIES
	At September 30, 2013 and December 31, 2012, inventories consisted of the following:
		September 30,		December 31,
		2013		2012
	Supplies	$	15,275	$	13,472
	Raw materials and work in process		11,865		10,720
	Finished goods		31,987		15,643
	Total inventories	$	59,127	$	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. Finished goods increased $16.4 million to $32.0 million as of September 30, 2013 compared to $15.6 million as of December 31, 2012, primarily due to an increase of inventory held at transloads.

Property_Plant_and_Mine_Develo

Property, Plant and Mine Development	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant and Mine Development	'
	NOTE G—PROPERTY, PLANT AND MINE DEVELOPMENT
	At September 30, 2013 property, plant and mine development consisted of the following:
		As of September 30, 2013
		Cost		Accumulated			Net Book Value
				Depreciation/
				Amortization
	Mining property and mine development	$	163,537	$	(19,280	)	$	144,257
	Asset retirement cost		6,799		(787	)		6,012
	Land		25,738		—			25,738
	Land improvements		29,550		(6,233	)		23,317
	Buildings		35,332		(6,032	)		29,300
	Machinery and equipment		245,234		(71,064	)		174,170
	Furniture and fixtures		965		(231	)		734
			507,155		(103,627	)		403,528
	Construction-in-progress		34,220		—			34,220
		$	541,375	$	(103,627	)	$	437,748
	At December 31, 2012 property, plant and mine development consisted of the following:
		As of December 31, 2012
		Cost		Accumulated			Net Book Value
				Depreciation/
				Amortization
	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 expense, including depletion and amortization, recognized during the three months ended September 30, 2013 and 2012 was $9.2 million and $6.0 million, respectively, and $26.3 million and $17.9 million for the nine months ended September 30, 2013 and 2012, respectively. The amount of interest costs capitalized in property, plant and equipment was $106 and $308 for the three months ended September 30, 2013 and 2012, respectively, and $365 and $541 for the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013, we hold $266 of assets under a capital lease obligation.

Accrued_Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 30, 2013
Payables And Accruals [Abstract]	'
Accrued Liabilities	'
	NOTE H—ACCRUED LIABILITIES
	At September 30, 2013 and December 31, 2012, accrued liabilities consisted of the following:
		September 30,		December 31,
		2013		2012
	Accrued salaries and wages	$	2,159	$	2,939
	Accrued vacation liability		2,263		2,397
	Current portion of liability for pension and post-retirement benefits		1,946		1,413
	Accrued healthcare liability		1,453		1,278
	Other accrued liabilities		2,934		1,454
	Total accrued liabilities	$	10,755	$	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

Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Debt	'
	NOTE I—DEBT
	As discussed below, on July 23, 2013, we refinanced our existing senior secured debt by amending our Term Loan and replacing our existing Revolver. At September 30, 2013 and December 31, 2012, debt consisted of the following:
		September 30,			December 31,
		2013			2012
	Revolving line-of-credit:	$	—	(1)	$	—	-2
	(1) Revolver expiring July 23, 2018 (4.75% at September 30, 2013)
	(2) Revolver expiring October 31, 2016 (5.0% at December 31, 2012); replaced by (1) on July 23, 2013
	Senior secured credit facility:		372,322			255,425
	Term loan facility—final maturity July 23, 2020 (4% at September 30, 2013 and 4.75% at December 31, 2012), net of unamortized original issue discount of $1,740 and $675, respectively
	Total debt		372,322			255,425
	Less: current portion		(3,487	)		(2,433	)
	Total long-term portion of debt	$	368,835		$	252,992
	Revolving Line-of-Credit
	As of September 30, 2013, the available borrowing base under our revolving line-of-credit (the “Revolver”) was $50 million, with zero drawn as of that date and $9.3 million allocated for letters of credit, leaving $40.7 million available for general corporate use under this revolving credit agreement.
	Debt Maturities
	As of September 30, 2013, contractual maturities of our debt are as follows:
	2013	$	872
	2014		3,488
	2015		3,490
	2016		3,493
	2017		3,495
	2018		3,498
	Thereafter		353,986
		$	372,322
	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.
	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 July 23, 2013, we refinanced our existing senior secured debt by amending our Term Loan and replacing our existing Revolver. The Term Loan amendment refinanced our existing senior debt by entering into a new $425 million senior secured credit facility, consisting of a $375 million Term Loan and a $50 million new Revolver that may also be used for swingline loans (up to $5 million) or letters of credit (up to $20 million). The Term Loan amendment also, among other things, removed and amended certain financial and other covenants to provide additional operating flexibility, and lowered interest rates on borrowed amounts. The existing Revolver was terminated. The Term Loan will expire on July 23, 2020 and the new Revolver will expire on July 23, 2018. As a result of refinancing our Term Loan and replacing our Revolver, we expensed $1.6 million of costs consisting of $1.1 million related to third party fees in selling, general, and administrative expenses and $0.5 million related to early extinguishment of debt.
	Our senior secured credit facility is secured by substantially all of our assets and a pledge of the equity interests in certain of our subsidiaries. The facility contains covenants that, among other things, govern our ability to create, incur or assume indebtedness and liens, to make acquisitions or investments, to pay dividends and to sell assets. The facility also requires us to maintain a consolidated leverage ratio of no more than 3.75:1.00 as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 25% of the Revolver commitment. As of September 30, 2013, we are in compliance with all covenants in accordance with our senior secured credit facility.

Asset_Retirement_Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 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 September 30, 2013 and December 31, 2012, we had recorded a liability of $8.7 million and $6.7 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation during the nine month period ended September 30, 2013 and the year ended December 31, 2012, respectively, are as follows:
			September 30,		December  31,
			2013		2012(1)
	Beginning balance		$	6,659	$	9,504
	Liabilities settled/payments			—		—
	Accretion expense			343		658
	Additions, revisions of prior estimates and other			1,675		(3,503	)
	Ending balance		$	8,677	$	6,659
	(1)	Represents change in the asset retirement obligation during the 12-month period ended December 31, 2012.

Fair_Value_Accounting

Fair Value Accounting	9 Months Ended
	Sep. 30, 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 September 30, 2013 and December 31, 2012 approximate their reported carrying values.
	Short-Term Investments
	In general, the fair value of our short-term investments is based on quoted prices for similar assets in active markets, or for identical assets or similar assets in markets in which there were fewer transactions. Money market mutual funds are based on calculated net asset value. Variable rate demand obligations underwritten and remarketed by a financial institution are priced at par value.
	Long-Term Debt, including current maturities
	We believe that the fair values of our long-term debt, including current maturities, approximate 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 September 30, 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 of those assets that we measure at fair value on a recurring basis:
		September 30, 2013						December 31, 2012
		Level 1		Level 2		Total		Level 1		Level 2		Total
	Short-term investments	$	19,119	$	5,867	$	24,986	$	—	$	—	$	—
	Interest rate derivatives		—		150		150		—		11		11
	Net asset	$	19,119	$	6,017	$	25,136	$	—	$	11	$	11

ShortTerm_Investments

Short-Term Investments	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Short-Term Investments	'
	NOTE L—SHORT-TERM INVESTMENTS
	We have segregated funds into designated accounts with an investment broker who manages our short-term investment portfolio. Those funds are held on an available-for-sale basis and are therefore reported at fair value on the balance sheet.
	The following table summarizes our available-for-sale short-term investments as of September 30, 2013:
		Aggregate		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
	Money market mutual funds	$	11,538	$	—	$	—		$	11,538
	Fixed income securities:
	Certificates of deposit		7,595		—		(14	)		7,581
	Variable Rate Demand Obligations		5,867		—		—			5,867
	Total available-for-sale investments	$	25,000	$	—	$	(14	)	$	24,986

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	NOTE M—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 entered into two interest rate cap agreements that effectively place an upper limit for one-month LIBOR at 4.0% 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. On June 30, 2013 the second agreement matured. No additional expense was reclassified from accumulated other comprehensive income or recognized directly in earnings as a result of the maturity or adjustment. We entered into two interest rate cap agreements on April 8, 2013 and September 6, 2013 with a notional amount of $128 million and $60 million, respectively, which effectively place an upper limit for three-month LIBOR at 4.0%.
	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 nine months ended September 30, 2013 and the year ended December 31, 2012, we had no ineffectiveness for such contracts.
	The following table summarizes the fair value of our derivative instruments. See Note K on fair value accounting for additional disclosures regarding the estimated fair values of our derivative instruments at September 30, 2013 and December 31, 2012.
						September 30, 2013									December 31, 2012
			Maturity			Contract/Notional			Carrying			Fair			Contract/Notional		Carrying		Fair
			Date			Amount			Amount			Value			Amount		Amount		Value
	Interest rate cap agreement(1)			2013		$	—		$	—		$	—		$	130 million	$	—	$	—
				2016		$	188 million		$	150		$	150		$	—	$	—	$	—
	-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 and nine months ended September 30, 2013 and 2012.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013			2012
	Deferred gain (loss) from derivatives in OCI, beginning of period		$	55		$	(248	)	$	(183	)	$	(409	)
	Gain (loss) recognized in OCI from derivative instruments			(112	)		—			(57	)		(11	)
	Gain (loss) reclassified from Accumulated OCI into income			1			2			184			174
	Deferred gain (loss) from derivatives in OCI, end of period		$	(56	)	$	(246	)	$	(56	)	$	(246	)

EquityBased_Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Equity-Based Compensation	'
	NOTE N—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 September 30, 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 Holdings to three members of executive management; one of whom continues to be employed by us at September 30, 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 September 30, 2013 and 2012, respectively, and $82 and $164 during the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013, there was $119 of total unrecognized compensation expense related to equity incentive shares, which is expected to be recognized over a weighted-average period of approximately 1.08 years.
	For awards granted under the 2011 Plan, we recognized $827 and $459 of compensation expense during the three months ended September 30, 2013 and 2012, respectively and $2,154 and $1,498 during the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013, there was $7.0 million of total unrecognized compensation expense related to equity incentive awards, which is expected to be recognized over a weighted-average period of approximately 2.63 years.

Leases

Leases	9 Months Ended
	Sep. 30, 2013
Leases [Abstract]	'
Leases	'
	NOTE O—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 September 30, 2013 are as follows:
	2013		14,752
	2014		15,772
	2015		14,062
	2016		11,844
	2017		9,678
	Thereafter		23,092
	Total future lease commitments	$	89,200
	Expense related to operating leases and rental agreements was $4.5 million and $3.2 million for the three months ended September 30, 2013 and 2012, respectively, and $10.9 million and $8.7 million for the nine months ended September 30, 2013 and 2012, respectively.
	As of September 30, 2013, we have a capital lease obligation of $266 which is expected to be repaid in 2013. We had no obligation under a capital lease as of September 30, 2012.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	NOTE P—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 nine months ended September 30, 2013, three new claims were brought against U.S. Silica. As of September 30, 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 September 30, 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.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	NOTE Q—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 September 30, 2013 and December 31, 2012. Tax returns filed with the IRS for the years 2010 through 2012 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.
	We are evaluating the potential impact of the final regulations released on September 13, 2013 concerning amounts paid to acquire, produce or improve tangible property and recovery of basis upon disposition. Because the revenue procedures governing the tangible property regulations will not be issued until the fourth quarter or later, we are still determining whether or not any changes in accounting method will be required and if they will result in a material impact to our financial statements. At this time, we do not anticipate there being a material impact.

Pension_and_PostRetirement_Ben

Pension and Post-Retirement Benefits	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Pension and Post-Retirement Benefits	'
	NOTE R—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 and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	(320	)	$	(280	)	$	(960	)	$	(839	)
	Interest cost		(1,049	)		(1,183	)		(3,148	)		(3,550	)
	Expected return on plan assets		1,265			1,345			3,796			4,036
	Amortization of prior service cost		(21	)		(6	)		(63	)		(20	)
	Amortization of net (gain) loss		(455	)		(270	)		(1,366	)		(809	)
	Net periodic benefit cost	$	(580	)	$	(394	)	$	(1,741	)	$	(1,182	)
	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 and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	(24	)	$	(33	)	$	(139	)	$	(149	)
	Interest cost		(116	)		(192	)		(622	)		(785	)
	Expected return on plan assets		1			1			3			3
	Amortization of net (gain) loss		(11	)		(29	)		(159	)		(219	)
	Net periodic benefit cost	$	(150	)	$	(253	)	$	(917	)	$	(1,150	)
	We contributed $1.5 and $1.7 million to the qualified pension plan during the three months ended September 30, 2013 and 2012, respectively, and $2.3 and $4.8 during the nine months ended September 30, 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 $1.2 million for the post-retirement medical and life plan.

Obligations_Under_Guarantees

Obligations Under Guarantees	9 Months Ended
	Sep. 30, 2013
Guarantees [Abstract]	'
Obligations Under Guarantees	'
	NOTE S—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 September 30, 2013, Travelers had $7.4 million in bonds outstanding for us. The majority of these bonds ($7.2 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 September 30, 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, 2015, 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

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	NOTE T—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 GGC Holdings 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 and nine months ended September 30, 2013.
	Promissory Note
	On December 22, 2010, GGC RCS Holdings, Inc., entered into a $15.0 million promissory note with GGC Holdings, our sole stockholder prior to the IPO and now largest stockholder. The note provided working capital for a new subsidiary and was scheduled to mature 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 Holdings 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.

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Reporting	'
	NOTE U—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 and nine months ended September 30, 2013 and 2012:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Sales:
	Oil & Gas Proppants	$	94,174		$	64,538		$	245,428		$	172,845
	Industrial & Specialty Products		50,198			51,347			151,083			150,230
	Total sales		144,372			115,885			396,511			323,075
	Segment contribution margin:
	Oil & Gas Proppants		40,129			34,236			111,766			102,563
	Industrial & Specialty Products		14,546			14,184			43,150			40,568
	Total segment contribution margin		54,675			48,420			154,916			143,131
	Operating activities excluded from segment cost of goods sold		(1,286	)		(2,241	)		(4,097	)		(5,603	)
	Selling, general and administrative		(12,800	)		(10,135	)		(35,303	)		(29,757	)
	Depreciation, depletion and amortization		(9,152	)		(5,968	)		(26,320	)		(17,920	)
	Interest expense		(4,144	)		(3,326	)		(11,255	)		(10,551	)
	Early extinguishment of debt		(480	)		—			(480	)		—
	Other income, net, including interest income		260			348			445			681
	Income before income taxes	$	27,073		$	27,098		$	77,906		$	79,981
	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 September 30, 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.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	NOTE V—SUBSEQUENT EVENTS
	On October 3, 2013 we paid a cash dividend of $0.125 per share to common stockholders of record on September 19, 2013, as had been declared by our Board of Directors on July 29, 2013.
	On October 24, 2013, our Board of Directors declared a quarterly cash dividend of $0.125 per share to common stockholders of record at the close of business on December 16, 2013, payable on January 3, 2014.
	On November 4, 2013, our Board of Directors extended our $25.0 million stock repurchase program through December 11, 2014. This program had been scheduled to expire on December 11, 2013.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The consolidated financial statements as of and for the three and nine months ended September 30, 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 and nine months ended September 30, 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 September 30, 2013, and December 31, 2012, the results of our operations for the three and nine months ended September 30, 2013 and 2012, and our cash flows for the nine months ended September 30, 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 September 30, 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 Condensed Consolidated Balance Sheets as our “Balance Sheets,” (ii) our Condensed Consolidated Statements of Operations as our “Income Statements,” and (iii) our Condensed Consolidated Statements of Cash Flows as our “Cash Flows.”
Unaudited Interim Financial Statements	'
	Unaudited Interim Financial Statements
	The accompanying Balance Sheet as of September 30, 2013, the Income Statements for the three and nine months ended September 30, 2013 and 2012; the Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2013 and 2012; the Consolidated Statements of Cash Flows for the nine months ended September 30, 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.
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.
Recently Adopted Accounting Pronouncements	'
	Recently Adopted Accounting Pronouncements
	In May 2011, the 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.
	In July 2013, the FASB amended Accounting Standards Codification (“ASC Topic 740”), “Income Taxes.” The amendment provides guidance on the financial statement presentation of an unrecognized tax benefit, as either a reduction of a deferred tax asset or as a liability, when a net operating loss carry-forward, a similar tax loss or a tax credit carry-forward exists. The amendment will be effective for interim and annual periods beginning after December 15, 2013 and may be applied on a retrospective basis. Early adoption is permitted. We do not expect the adoption of this amendment to have a significant effect on our consolidated financial position or results of operations.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Basic and Diluted Earnings Per Share	'
	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. The weighted average outstanding stock options excluded were (in thousands) 193 and 169 for the three and nine months ended September 30, 2013, respectively, and 1,384 and 998 for the three and nine months ended September 30, 2012.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013			2012
	Net income	$	21,334		$	18,796	$	58,803		$	57,360
	Less: net income allocated to outstanding restricted stockholders		(74	)		—		(116	)		—
	Net income allocated to common stockholders	$	21,260		$	18,796	$	58,687		$	57,360
	Weighted-average common stock
	Outstanding		53,103			52,873		52,963			52,585
	Outstanding assuming dilution		53,429			52,887		53,263			52,628

Capital_Structure_and_Accumula1

Capital Structure and Accumulated Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Schedule of Stockholders' Equity	'
	The following table presents the activity included in stockholders’ equity during the nine months ended September 30, 2013.
			Common			Treasury			Additional			Retained			Accumulated			Total
			Stock			Stock			Paid-In Capital			Earnings			Other			Stockholders’
												(Deficit)			Comprehensive			Equity
															Income (Loss)
	Balance at December 31, 2012		$	529		$	(970	)	$	163,579		$	82,731		$	(14,175	)	$	231,694
	Net Income			—			—			—			58,803			—			58,803
	Other comprehensive income, net of tax			—			—			—			—			1,045			1,045
	Proceeds from options exercised			4			1,115			5,386			—			—			6,505
	Shares withheld to pay taxes due upon vesting of restricted stock			—			(145	)		—			—			—			(145	)
	Cash dividends declared ($0.250 per share of common stock)			—			—			—			(13,315	)		—			(13,315	)
	Equity-based compensation			—			—			2,236			—			—			2,236
	Excess tax benefit from equity-based compensation			—			—			823			—			—			823
	Balance at September 30, 2013		$	533		$	—		$	172,024		$	128,219		$	(13,130	)	$	287,646
Changes in Accumulated Other Comprehensive Income	'
	The following table presents the changes in accumulated other comprehensive income by component during the nine months ended September 30, 2013:
			For the Nine Months Ended September 30,  2013
			Unrealized			Unrealized			Pension and			Total
			gain/(loss) on			gain/(loss) on			other
			cash flow hedges			short-term			postretirement
						investments			benefits liability
	Beginning Balance		$	(183	)	$	—		$	(13,992	)	$	(14,175	)
	Other comprehensive income (loss) before reclassifications			(57	)		(10	)		—			(67	)
	Amounts reclassed from accumulated other comprehensive income			184			—			928			1,112
	Ending Balance		$	(56	)	$	(10	)	$	(13,064	)	$	(13,130	)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	'
	The following table presents the reclassifications out of accumulated other comprehensive income (loss) during the nine months ended September 30, 2013:
	Details about accumulated other comprehensive income		Amount reclassified from			Affected line item in the
			accumulated other			statement of operations
			comprehensive income
	Gains and losses on cash flow hedges
	Interest rate contracts		$	301		Interest expense
				(117	)	Tax expense
			$	184		Net of tax
	Amortization of postretirement benefits liability
	Actuarial gains/(losses)		$	1,450		-1
	Prior service cost			69		-1
			$	1,519		Total before tax
				(591	)	Tax expense
				928		Net of tax
	Total reclassifications for the period		$	1,112		Net of tax
	(1)	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see note R).

Accounts_Receivable_Tables

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Schedule of Accounts Receivable	'
	At September 30, 2013 and December 31, 2012, accounts receivable consisted of the following:
		September 30,			December 31,
		2013			2012
	Trade receivables	$	75,588		$	56,519
	Less: Allowance for doubtful accounts		(1,056	)		(1,053	)
	Net trade receivables		74,532			55,466
	Other receivables		129			4,098
	Total accounts receivable	$	74,661		$	59,564

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Schedule of Inventories	'
	At September 30, 2013 and December 31, 2012, inventories consisted of the following:
		September 30,		December 31,
		2013		2012
	Supplies	$	15,275	$	13,472
	Raw materials and work in process		11,865		10,720
	Finished goods		31,987		15,643
	Total inventories	$	59,127	$	39,835

Property_Plant_and_Mine_Develo1

Property, Plant and Mine Development (Tables)	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Schedule of Property, Plant and Mine Development	'
	At September 30, 2013 property, plant and mine development consisted of the following:
		As of September 30, 2013
		Cost		Accumulated			Net Book Value
				Depreciation/
				Amortization
	Mining property and mine development	$	163,537	$	(19,280	)	$	144,257
	Asset retirement cost		6,799		(787	)		6,012
	Land		25,738		—			25,738
	Land improvements		29,550		(6,233	)		23,317
	Buildings		35,332		(6,032	)		29,300
	Machinery and equipment		245,234		(71,064	)		174,170
	Furniture and fixtures		965		(231	)		734
			507,155		(103,627	)		403,528
	Construction-in-progress		34,220		—			34,220
		$	541,375	$	(103,627	)	$	437,748
	At December 31, 2012 property, plant and mine development consisted of the following:
		As of December 31, 2012
		Cost		Accumulated			Net Book Value
				Depreciation/
				Amortization
	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

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Payables And Accruals [Abstract]	'
Schedule of Accrued Liabilities	'
	At September 30, 2013 and December 31, 2012, accrued liabilities consisted of the following:
		September 30,		December 31,
		2013		2012
	Accrued salaries and wages	$	2,159	$	2,939
	Accrued vacation liability		2,263		2,397
	Current portion of liability for pension and post-retirement benefits		1,946		1,413
	Accrued healthcare liability		1,453		1,278
	Other accrued liabilities		2,934		1,454
	Total accrued liabilities	$	10,755	$	9,481

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Schedule of Debt	'
	At September 30, 2013 and December 31, 2012, debt consisted of the following:
		September 30,			December 31,
		2013			2012
	Revolving line-of-credit:	$	—	(1)	$	—	-2
	(1) Revolver expiring July 23, 2018 (4.75% at September 30, 2013)
	(2) Revolver expiring October 31, 2016 (5.0% at December 31, 2012); replaced by (1) on July 23, 2013
	Senior secured credit facility:		372,322			255,425
	Term loan facility—final maturity July 23, 2020 (4% at September 30, 2013 and 4.75% at December 31, 2012), net of unamortized original issue discount of $1,740 and $675, respectively
	Total debt		372,322			255,425
	Less: current portion		(3,487	)		(2,433	)
	Total long-term portion of debt	$	368,835		$	252,992
Schedule of Contractual Maturities of Debt	'
	As of September 30, 2013, contractual maturities of our debt are as follows:
	2013	$	872
	2014		3,488
	2015		3,490
	2016		3,493
	2017		3,495
	2018		3,498
	Thereafter		353,986
		$	372,322

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Schedule of Changes in Asset Retirement Obligation	'
	Changes in the asset retirement obligation during the nine month period ended September 30, 2013 and the year ended December 31, 2012, respectively, are as follows:
			September 30,		December  31,
			2013		2012(1)
	Beginning balance		$	6,659	$	9,504
	Liabilities settled/payments			—		—
	Accretion expense			343		658
	Additions, revisions of prior estimates and other			1,675		(3,503	)
	Ending balance		$	8,677	$	6,659
	(1)	Represents change in the asset retirement obligation during the 12-month period ended December 31, 2012.

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	9 Months Ended
	Sep. 30, 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 of those assets that we measure at fair value on a recurring basis:
		September 30, 2013						December 31, 2012
		Level 1		Level 2		Total		Level 1		Level 2		Total
	Short-term investments	$	19,119	$	5,867	$	24,986	$	—	$	—	$	—
	Interest rate derivatives		—		150		150		—		11		11
	Net asset	$	19,119	$	6,017	$	25,136	$	—	$	11	$	11

ShortTerm_Investments_Tables

Short-Term Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Summary of Available-for-sale Short-Term Investments	'
	The following table summarizes our available-for-sale short-term investments as of September 30, 2013:
		Aggregate		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
	Money market mutual funds	$	11,538	$	—	$	—		$	11,538
	Fixed income securities:
	Certificates of deposit		7,595		—		(14	)		7,581
	Variable Rate Demand Obligations		5,867		—		—			5,867
	Total available-for-sale investments	$	25,000	$	—	$	(14	)	$	24,986

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Estimated Fair Values of Derivative Instruments	'
	The following table summarizes the fair value of our derivative instruments. See Note K on fair value accounting for additional disclosures regarding the estimated fair values of our derivative instruments at September 30, 2013 and December 31, 2012.
						September 30, 2013									December 31, 2012
			Maturity			Contract/Notional			Carrying			Fair			Contract/Notional		Carrying		Fair
			Date			Amount			Amount			Value			Amount		Amount		Value
	Interest rate cap agreement(1)			2013		$	—		$	—		$	—		$	130 million	$	—	$	—
				2016		$	188 million		$	150		$	150		$	—	$	—	$	—
	(1)	Agreements limit the LIBOR floating interest rate base to 4%.
Effect of Derivatives Instruments on Combined Statements of Operations and Comprehensive Income	'
	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 and nine months ended September 30, 2013 and 2012.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013			2012
	Deferred gain (loss) from derivatives in OCI, beginning of period		$	55		$	(248	)	$	(183	)	$	(409	)
	Gain (loss) recognized in OCI from derivative instruments			(112	)		—			(57	)		(11	)
	Gain (loss) reclassified from Accumulated OCI into income			1			2			184			174
	Deferred gain (loss) from derivatives in OCI, end of period		$	(56	)	$	(246	)	$	(56	)	$	(246	)

Leases_Tables

Leases (Tables)	9 Months Ended
	Sep. 30, 2013
Leases [Abstract]	'
Future Minimum Annual Commitments under Operating Leases	'
	Future minimum annual commitments under such operating leases at September 30, 2013 are as follows:
	2013		14,752
	2014		15,772
	2015		14,062
	2016		11,844
	2017		9,678
	Thereafter		23,092
	Total future lease commitments	$	89,200

Pension_and_PostRetirement_Ben1

Pension and Post-Retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Summarizes Information about Pension and Post-Retirement Benefit Plans	'
	Net periodic pension benefit cost recognized for the three and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	(320	)	$	(280	)	$	(960	)	$	(839	)
	Interest cost		(1,049	)		(1,183	)		(3,148	)		(3,550	)
	Expected return on plan assets		1,265			1,345			3,796			4,036
	Amortization of prior service cost		(21	)		(6	)		(63	)		(20	)
	Amortization of net (gain) loss		(455	)		(270	)		(1,366	)		(809	)
	Net periodic benefit cost	$	(580	)	$	(394	)	$	(1,741	)	$	(1,182	)
	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 and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	(24	)	$	(33	)	$	(139	)	$	(149	)
	Interest cost		(116	)		(192	)		(622	)		(785	)
	Expected return on plan assets		1			1			3			3
	Amortization of net (gain) loss		(11	)		(29	)		(159	)		(219	)
	Net periodic benefit cost	$	(150	)	$	(253	)	$	(917	)	$	(1,150	)

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results	'
	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 and nine months ended September 30, 2013 and 2012:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Sales:
	Oil & Gas Proppants	$	94,174		$	64,538		$	245,428		$	172,845
	Industrial & Specialty Products		50,198			51,347			151,083			150,230
	Total sales		144,372			115,885			396,511			323,075
	Segment contribution margin:
	Oil & Gas Proppants		40,129			34,236			111,766			102,563
	Industrial & Specialty Products		14,546			14,184			43,150			40,568
	Total segment contribution margin		54,675			48,420			154,916			143,131
	Operating activities excluded from segment cost of goods sold		(1,286	)		(2,241	)		(4,097	)		(5,603	)
	Selling, general and administrative		(12,800	)		(10,135	)		(35,303	)		(29,757	)
	Depreciation, depletion and amortization		(9,152	)		(5,968	)		(26,320	)		(17,920	)
	Interest expense		(4,144	)		(3,326	)		(11,255	)		(10,551	)
	Early extinguishment of debt		(480	)		—			(480	)		—
	Other income, net, including interest income		260			348			445			681
	Income before income taxes	$	27,073		$	27,098		$	77,906		$	79,981

Organization_Additional_Inform

Organization - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jan. 31, 2012	Jul. 08, 2011	Nov. 25, 2008	Jan. 31, 2012	Feb. 06, 2012	Sep. 30, 2013	Jan. 31, 2012	Jan. 31, 2012
							Convertible Note Payable [Member]	IPO [Member]	IPO [Member]	IPO [Member]	IPO [Member]
											Promissory Note [Member]
Organization And Nature Of Business [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Common stock issued	53,384,264	'	52,843,176	'	'	1,000	'	2,941,176	'	'	'
Aggregate purchase price	$533,000	$529,000	'	'	'	$10	'	'	'	'	'
Common stock authorized	500,000,000	'	'	500,000,000	100,000,000	'	'	'	'	2,941,176	'
Split ratio of common stock	'	'	'	'	'50,000-for-one split	'	'	'	'	'	'
Authorized preferred stock	10,000,000	'	'	10,000,000	'	'	'	'	'	'	'
Stockholders common stock issued	'	'	'	'	'	'	'	8,823,529	'	'	'
Common stock, offering price	'	'	'	'	'	'	'	$17	'	'	'
Aggregate offering price at common stock	'	'	'	'	'	'	'	50,000,000	'	'	'
Underwriting discounts and commissions	'	'	'	'	'	'	'	'	3,500,000	'	'
Offering expenses	'	'	'	'	'	'	'	'	5,700,000	'	'
Net proceeds	'	'	'	'	'	'	'	'	40,800,000	'	'
Aggregate offering price at stockholders common stock	'	'	'	'	'	'	'	150,000,000	'	'	'
GGC RCS Holdings, Inc.-note payable converted to equity contribution	'	'	'	'	'	'	15,000,000	'	'	'	'
Accrued interest	'	'	'	'	'	'	'	'	'	'	$1,700,000

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Percentage of fair value of reporting unit less than carrying amount	50.00%

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail) (Stock Option [Member])	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Option [Member]	'	'	'	'
Earnings Per Share [Line Items]	'	'	'	'
Weighted average outstanding stock options excluded	193	1,384	169	998

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income	$21,334	$18,796	$58,803	$57,360
Less: net income allocated to outstanding restricted stockholders	-74	'	-116	'
Net income allocated to common stockholders	$21,260	$18,796	$58,687	$57,360
Outstanding	53,103	52,873	52,963	52,585
Outstanding assuming dilution	53,429	52,887	53,263	52,628

Capital_Structure_and_Accumula2

Capital Structure and Accumulated Comprehensive Income - Additional Information (Detail) (USD $)	9 Months Ended						9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Jul. 29, 2013	Sep. 30, 2012	Jan. 31, 2012	Jul. 08, 2011	Nov. 25, 2008	Sep. 30, 2013	Jun. 11, 2012
							Common Stock [Member]	Common Stock [Member]
Comprehensive Income And Equity [Line Items]	'	'	'	'	'	'	'	'
Common stock authorized, shares	500,000,000	'	'	500,000,000	100,000,000	'	'	'
Common stock, par value	$0.01	'	'	'	'	'	'	'
Common stock issued	53,384,264	'	52,843,176	'	'	1,000	'	'
Common stock, shares outstanding	53,384,264	'	52,843,176	'	'	'	'	'
Quarterly cash dividend declared	'	$0.13	'	'	'	'	'	'
Dividend declared date	29-Jul-13	'	'	'	'	'	'	'
Dividend declared, record date	19-Sep-13	'	'	'	'	'	'	'
Dividend declared, payable date	3-Oct-13	'	'	'	'	'	'	'
Preferred stock, shares authorized	10,000,000	'	'	10,000,000	'	'	'	'
Preferred stock, par value	$0.01	'	'	'	'	'	'	'
Preferred stock issued	0	'	0	'	'	'	'	'
Preferred stock, shares outstanding	0	'	0	'	'	'	'	'
Authorization to repurchase common stock	'	'	'	'	'	'	$25	'
Common stock repurchase authorization period	'	'	'	'	'	'	'18 months	'
Common stock repurchase authorization period, conclusion date	'	'	'	'	'	'	'	11-Dec-13
Number of repurchased shares, common stock	'	'	'	'	'	'	100,000	'
Repurchased common stock, average price	'	'	'	'	'	'	$10.72	'
Remaining authorized repurchase of common stock amount	'	'	'	'	'	'	$23.90	'
Re-issued shares to satisfy employee option exercises	'	'	'	'	'	'	100,000	'

Capital_Structure_and_Accumula3

Capital Structure and Accumulated Comprehensive Income - Schedule of Stockholders' Equity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	$231,694	'
Net income	21,334	18,796	58,803	57,360
Other comprehensive income, net of tax	125	139	1,045	761
Proceeds from options exercised	'	'	6,505	'
Shares withheld to pay taxes due upon vesting of restricted stock	'	'	-145	'
Cash dividends declared ($0.250 per share of common stock)	'	'	-13,315	'
Equity-based compensation	'	'	2,236	'
Excess tax benefit from equity-based compensation	'	'	823	'
Ending balance	287,646	'	287,646	'
Common Stock [Member]	'	'	'	'
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	529	'
Proceeds from options exercised	'	'	4	'
Ending balance	533	'	533	'
Treasury Stock [Member]	'	'	'	'
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	-970	'
Proceeds from options exercised	'	'	1,115	'
Shares withheld to pay taxes due upon vesting of restricted stock	'	'	-145	'
Additional Paid-In Capital [Member]	'	'	'	'
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	163,579	'
Proceeds from options exercised	'	'	5,386	'
Equity-based compensation	'	'	2,236	'
Excess tax benefit from equity-based compensation	'	'	823	'
Ending balance	172,024	'	172,024	'
Retained Earnings (Deficit) [Member]	'	'	'	'
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	82,731	'
Net income	'	'	58,803	'
Cash dividends declared ($0.250 per share of common stock)	'	'	-13,315	'
Ending balance	128,219	'	128,219	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'
Shareholders Equity [Line Items]	'	'	'	'
Beginning balance	'	'	-14,175	'
Other comprehensive income, net of tax	'	'	1,045	'
Ending balance	($13,130)	'	($13,130)	'

Capital_Structure_and_Accumula4

Capital Structure and Accumulated Comprehensive Income - Schedule of Stockholders' Equity (Parenthetical) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Shareholders Equity [Line Items]	'
Quarterly cash dividend declared	$0.25
Retained Earnings (Deficit) [Member]	'
Shareholders Equity [Line Items]	'
Quarterly cash dividend declared	$0.25

Capital_Structure_and_Accumula5

Capital Structure and Accumulated Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Beginning Balance	($14,175)
Other comprehensive income (loss) before reclassifications	-67
Amounts reclassed from accumulated other comprehensive income	1,112
Ending Balance	-13,130
Unrealized Gain/(Loss) on Cash Flow Hedges [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Beginning Balance	-183
Other comprehensive income (loss) before reclassifications	-57
Amounts reclassed from accumulated other comprehensive income	184
Ending Balance	-56
Unrealized Gain/(Loss) on Short-Term Investments [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Beginning Balance	'
Other comprehensive income (loss) before reclassifications	-10
Amounts reclassed from accumulated other comprehensive income	'
Ending Balance	-10
Pension and Other Postretirement Benefits Liability [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Beginning Balance	-13,992
Other comprehensive income (loss) before reclassifications	'
Amounts reclassed from accumulated other comprehensive income	928
Ending Balance	($13,064)

Capital_Structure_and_Accumula6

Capital Structure and Accumulated Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Tax expense	($5,739)	($8,302)	($19,103)	($22,621)
Amount Reclassified from Accumulated Other Comprehensive Income [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Net of tax	'	'	1,112	'
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Tax expense	'	'	-117	'
Net of tax	'	'	184	'
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Pension and Other Postretirement Benefits Liability [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Actuarial gains/(losses)	'	'	1,450	'
Prior service cost	'	'	69	'
Total before tax	'	'	1,519	'
Tax expense	'	'	-591	'
Net of tax	'	'	928	'
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member] | Gains and Losses on Cash Flow Hedges [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Interest expense	'	'	$301	'

Accounts_Receivable_Schedule_o

Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Trade receivables	$75,588	$56,519
Less: Allowance for doubtful accounts	-1,056	-1,053
Net trade receivables	74,532	55,466
Other receivables	129	4,098
Total accounts receivable	$74,661	$59,564

Accounts_Receivable_Additional

Accounts Receivable - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
	Customer	Customer
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	32.00%	29.00%
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_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Supplies	$15,275	$13,472
Raw materials and work in process	11,865	10,720
Finished goods	31,987	15,643
Total inventories	$59,127	$39,835

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]	'	'
Increased in finished goods	$16,400,000	'
Finished goods	$31,987,000	$15,643,000

Property_Plant_and_Mine_Develo2

Property, Plant and Mine Development - Schedule of Property, Plant and Mine Development (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Cost	$541,375	$492,722
Accumulated Depreciation/Amortization	-103,627	-78,504
Net Book Value	437,748	414,218
Mining Property and Mine Development [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	163,537	163,538
Accumulated Depreciation/Amortization	-19,280	-15,778
Net Book Value	144,257	147,760
Asset Retirement Cost [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	6,799	5,124
Accumulated Depreciation/Amortization	-787	-597
Net Book Value	6,012	4,527
Land [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	25,738	24,795
Net Book Value	25,738	24,795
Land Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	29,550	27,604
Accumulated Depreciation/Amortization	-6,233	-4,034
Net Book Value	23,317	23,570
Buildings [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	35,332	31,558
Accumulated Depreciation/Amortization	-6,032	-4,354
Net Book Value	29,300	27,204
Machinery and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	245,234	221,139
Accumulated Depreciation/Amortization	-71,064	-53,599
Net Book Value	174,170	167,540
Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	965	915
Accumulated Depreciation/Amortization	-231	-142
Net Book Value	734	773
Property, Plant and Mine Development [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	507,155	474,673
Accumulated Depreciation/Amortization	-103,627	-78,504
Net Book Value	403,528	396,169
Construction-In-Progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Cost	34,220	18,049
Net Book Value	$34,220	$18,049

Property_Plant_and_Mine_Develo3

Property, Plant and Mine Development - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property Plant And Equipment [Abstract]	'	'	'	'
Depreciation expense, including depletion and amortization	$9,200,000	$6,000,000	$26,300,000	$17,900,000
Property, plant and equipment interest capitalization	106,000	308,000	365,000	541,000
Capital lease obligation	$266,000	'	$266,000	'

Accrued_Liabilities_Schedule_o

Accrued Liabilities - Schedule of Accrued Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Payables And Accruals [Abstract]	'	'
Accrued salaries and wages	$2,159	$2,939
Accrued vacation liability	2,263	2,397
Current portion of liability for pension and post-retirement benefits	1,946	1,413
Accrued healthcare liability	1,453	1,278
Other accrued liabilities	2,934	1,454
Total accrued liabilities	$10,755	$9,481

Debt_Schedule_of_Debt_Detail

Debt - Schedule of Debt (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Line of Credit Facility [Line Items]	'	'
Total debt	$372,322	$255,425
Less: current portion	-3,487	-2,433
Total long-term portion of debt	368,835	252,992
Revolving Line-of-Credit [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of credit available	'	'
Senior Secured Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of credit available	$372,322	$255,425

Debt_Schedule_of_Debt_Parenthe

Debt - Schedule of Debt (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Revolving Line-of-Credit [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Credit facility, maturity date	23-Jul-18	31-Oct-16
Credit facility, interest rate	4.75%	5.00%
Senior Secured Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Credit facility, maturity date	23-Jul-20	'
Credit facility, interest rate	4.00%	4.75%
Term loan facility unamortized original issue discount	1,740	675

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Short-term Debt [Line Items]	'	'
Available borrowing base	$425	'
Expense associated with refinancing our Term Loan and replacing Revolver	1.6	'
Third party fees in selling general, and administrative expenses	1.1	'
Expense associated with related to early extinguishment of debt	0.5	'
Facility consolidated leverage ratio	0.0375	'
Increase of commitment	25.00%	'
Revolving Line-of-Credit [Member]	'	'
Short-term Debt [Line Items]	'	'
Available borrowing base	50	'
Amount drawn from borrowing base	0	'
Amount allocated for letters of credit	9.3	'
Amount available for general corporate use under this revolving credit agreement	40.7	'
New Revolver expiration Date	23-Jul-18	31-Oct-16
Revolving Line-of-Credit [Member] | Minimum [Member]	'	'
Short-term Debt [Line Items]	'	'
Increase of commitment	'	35
Letter of credit sublimit	'	15
Revolving Line-of-Credit [Member] | Maximum [Member]	'	'
Short-term Debt [Line Items]	'	'
Increase of commitment	'	50
Letter of credit sublimit	'	20
Term Loan [Member]	'	'
Short-term Debt [Line Items]	'	'
Available borrowing base	375	'
New Revolver expiration Date	23-Jul-20	'
Swing Line Loans [Member]	'	'
Short-term Debt [Line Items]	'	'
Available borrowing base	5	'
Letter of Credit [Member]	'	'
Short-term Debt [Line Items]	'	'
Available borrowing base	$20	'

Debt_Schedule_of_Contractual_M

Debt - Schedule of Contractual Maturities of Debt (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
2013	$872
2014	3,488
2015	3,490
2016	3,493
2017	3,495
2018	3,498
Thereafter	353,986
Debt, Total	$372,322

Asset_Retirement_Obligations_A

Asset Retirement Obligations - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Asset Retirement Obligation Disclosure [Abstract]	'	'
Asset retirement obligation	$8.70	$6.70

Asset_Retirement_Obligations_S

Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligation (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]	'	'
Beginning balance	$6,659	$9,504
Liabilities settled/payments	'	'
Accretion expense	343	658
Additions, revisions of prior estimates and other	1,675	-3,503
Ending balance	$8,677	$6,659

Fair_Value_Accounting_Schedule

Fair Value Accounting - Schedule of Measure at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
Short term investments	$24,986	'
Interest rate derivatives	150	11
Net asset	25,136	11
Measured at Fair Value on Recurring Basis [Member] | Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Short term investments	19,119	'
Interest rate derivatives	'	'
Net asset	19,119	'
Measured at Fair Value on Recurring Basis [Member] | Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Short term investments	5,867	'
Interest rate derivatives	150	11
Net asset	$6,017	$11

ShortTerm_Investments_Schedule

Short-Term Investments - Schedule of Available-for-Sale Short-Term Investments (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Aggregate Cost	$25,000
Gross Unrealized Gains	'
Gross Unrealized Losses	-14
Fair Value	24,986
Money Market Mutual Funds [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Aggregate Cost	11,538
Gross Unrealized Gains	'
Fair Value	11,538
Certificates of Deposit [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Aggregate Cost	7,595
Gross Unrealized Gains	'
Gross Unrealized Losses	-14
Fair Value	7,581
Variable Rate Demand Obligation [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Aggregate Cost	5,867
Gross Unrealized Gains	'
Fair Value	$5,867

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Mar. 31, 2012	Sep. 30, 2013	Mar. 31, 2012	Mar. 31, 2012	Apr. 08, 2013	Sep. 06, 2013
			Interest Rate Cap Agreement [Member]	First Agreement [Member]	First Agreement [Member]	Second Agreement [Member]	Second Agreement [Member]	Second Agreement After Reset [Member]	Third Agreement [Member]	Fourth Agreement [Member]
			Agreement						Interest Rate Cap Agreement - New [Member]	Interest Rate Cap Agreement - New [Member]
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'	'	'	'	'	'	'
Derivative notional amount	'	$130,000,000	'	'	$100,000,000	'	$30,000,000	'	$128,000,000	$60,000,000
Derivative maturity date	'	'	'	31-Mar-12	'	30-Jun-13	'	'	'	'
Number of interest rate cap agreements	'	'	2	'	'	'	'	'	'	'
Upper limit of LIBOR for one-month	4.00%	4.00%	'	'	'	'	'	'	'	'
Notional amount after increase	'	'	'	'	'	'	'	130,000,000	'	'
Additional expenses reclassified from accumulated other comprehensive income or recognized directly in earnings	0	'	'	'	'	'	'	'	'	'
Upper limit of LIBOR for three-month	'	'	'	'	'	'	'	'	4.00%	4.00%
Derivative ineffective portion of the change in fair value	$0	$0	'	'	'	'	'	'	'	'

Derivative_Instruments_Estimat

Derivative Instruments - Estimated Fair Values of Derivative Instruments (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Contract/Notional Amount	'	$130,000,000
Interest Rate Cap Agreement [Member] | 2013 [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Maturity Date	'2013	'
Contract/Notional Amount	'	130,000,000
Carrying Amount	'	'
Fair Value	'	'
Interest Rate Cap Agreement [Member] | 2016 [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Maturity Date	'2016	'
Contract/Notional Amount	188,000,000	'
Carrying Amount	150,000	'
Fair Value	$150,000	'

Derivative_Instruments_Estimat1

Derivative Instruments - Estimated Fair Values of Derivative Instruments (Parenthetical) (Detail)	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'
Upper limit of LIBOR for one-month	4.00%	4.00%

Derivative_Instruments_Effect_

Derivative Instruments - Effect of Derivatives Instruments on Combined Statements of Operations and Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'	'	'
Deferred gain (loss) from derivatives in OCI, beginning of period	$55	($248)	($183)	($409)
Gain (loss) recognized in OCI from derivative instruments	-112	'	-57	-11
Gain (loss) reclassified from Accumulated OCI into income	1	2	184	174
Deferred gain (loss) from derivatives in OCI, end of period	($56)	($246)	($56)	($246)

EquityBased_Compensation_Addit

Equity-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Option Indexed to Issuer's Equity [Line Items]	'	'	'	'
Number of Equity Incentive Plans	'	'	2	'
Equity Program [Member]	'	'	'	'
Option Indexed to Issuer's Equity [Line Items]	'	'	'	'
Recognized compensation expense	$27	$55	$82	$164
Total unrecognized compensation expense	119	'	119	'
Recognized weighted-average period	'1 year 29 days	'	'	'
2011 Plan [Member]	'	'	'	'
Option Indexed to Issuer's Equity [Line Items]	'	'	'	'
Recognized compensation expense	827	459	2,154	1,498
Total unrecognized compensation expense	$7,000	'	$7,000	'
Recognized weighted-average period	'2 years 7 months 17 days	'	'	'

Leases_Future_Minimum_Annual_C

Leases - Future Minimum Annual Commitments under Operating Leases (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2013	$14,752
2014	15,772
2015	14,062
2016	11,844
2017	9,678
Thereafter	23,092
Total future lease commitments	$89,200

Leases_Additional_Information_

Leases - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Leases [Abstract]	'	'	'	'
Expense related to operating leases and rental agreements	$4,500,000	$3,200,000	$10,900,000	$8,700,000
Capital lease obligation	$266,000	$0	$266,000	$0

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2012	Sep. 30, 2013
		Claim
Insurance [Abstract]	'	'
New claims filed	'	3
Products liability claims outstanding	'	93
Underlying insurance policies receivable	$5,100,000	'
Third-party products claims liability under insurance in other assets	247,000	247,000
Third-party products claims liability under insurance in other long-term obligations	$1,300,000	$1,200,000

Pension_and_PostRetirement_Ben2

Pension and Post-Retirement Benefits - Summarizes Information about Pension and Post-Retirement Benefit Plans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Service cost	($320)	($280)	($960)	($839)
Interest cost	-1,049	-1,183	-3,148	-3,550
Expected return on plan assets	1,265	1,345	3,796	4,036
Amortization of prior service cost	-21	-6	-63	-20
Amortization of net (gain) loss	-455	-270	-1,366	-809
Net periodic benefit cost	-580	-394	-1,741	-1,182
Post-retirement Benefits [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Service cost	-24	-33	-139	-149
Interest cost	-116	-192	-622	-785
Expected return on plan assets	1	1	3	3
Amortization of net (gain) loss	-11	-29	-159	-219
Net periodic benefit cost	($150)	($253)	($917)	($1,150)

Pension_and_PostRetirement_Ben3

Pension and Post-Retirement Benefits - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Contributions to qualified pension plan	$1.50	$1.70	$2.30	$4.80
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	'	'	$1.20	'

Obligations_Under_Guarantees_A

Obligations Under Guarantees - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
	Vehicle
Surety Bonds [Member]	'
Loss Contingencies [Line Items]	'
Surety bonds outstanding	$7,400,000
Surety Bonds [Member] | Safeco Insurance Company of America [Member]	'
Loss Contingencies [Line Items]	'
Surety bonds outstanding	513,000
Reclamation Bonds [Member]	'
Loss Contingencies [Line Items]	'
Bonds related to reclamation requirements	7,200,000
Kanawha Rail Corporation's [Member]	'
Loss Contingencies [Line Items]	'
Number of railroad cars	199
Payment of monthly rent	$66,000

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended		1 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 06, 2012	Sep. 30, 2013	Sep. 30, 2013	Dec. 22, 2010	Jan. 31, 2012
					Golden Gate Capital Acquisition [Member]	Golden Gate Capital Acquisition [Member]	Promissory Note [Member]	Promissory Note [Member]	Promissory Note [Member]
									IPO [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'
Advisory fee to parent	'	'	'	'	'	$1.30	'	'	'
Transaction fee percent	'	'	'	'	'	1.25%	'	'	'
Termination of advisory agreement	'	'	'	'	8	'	'	'	'
Termination fee	'	'	'	8	'	'	'	'	'
Additional expense	0	0	0	'	'	'	'	'	'
Promissory note with GGC USS Holdings, LLC.	'	'	'	'	'	'	'	15	'
Promissory note, maturity date	'	'	'	'	'	'	22-Dec-15	'	'
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	'	'	'	'	'	'	'	'	1.7
Conversion of promissory note to equity	'	'	'	'	'	'	$15	'	'

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
	Product
	Segment
Operating Statistics [Line Items]	'	'
Number of reportable segments	2	'
Number of products in Industrial & Specialty segment	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

Segment_Reporting_Presentation

Segment Reporting - Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]	'	'	'	'
Total sales	$144,372	$115,885	$396,511	$323,075
Total segment contribution margin	54,675	48,420	154,916	143,131
Operating activities excluded from segment cost of goods sold	-1,286	-2,241	-4,097	-5,603
Selling, general and administrative	-12,800	-10,135	-35,303	-29,757
Depreciation, depletion and amortization	-9,152	-5,968	-26,320	-17,920
Interest expense	-4,144	-3,326	-11,255	-10,551
Early extinguishment of debt	-480	'	-480	'
Other income, net, including interest income	260	348	445	681
Income before income taxes	27,073	27,098	77,906	79,981
Operating Segments [Member] | Oil and Gas Proppants [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total sales	94,174	64,538	245,428	172,845
Total segment contribution margin	40,129	34,236	111,766	102,563
Operating Segments [Member] | Industrial and Specialty Products [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total sales	50,198	51,347	151,083	150,230
Total segment contribution margin	$14,546	$14,184	$43,150	$40,568

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Oct. 24, 2013	Oct. 03, 2013	Nov. 04, 2013	Oct. 03, 2013
		Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]
				Common Stock [Member]	Common Stock [Member]
Subsequent Event [Line Items]	'	'	'	'	'
Cash dividend paid	'	'	$0.13	'	'
Quarterly cash dividend declared	$0.25	$0.13	'	'	'
Dividend declared date	29-Jul-13	3-Jan-14	'	'	29-Jul-13
Dividend declared, record date	19-Sep-13	16-Dec-13	'	'	19-Sep-13
Dividend declared, payable date	3-Oct-13	3-Jan-14	'	'	'
Stock repurchase program, value	'	'	'	$25	'
End date of repurchase program	'	'	'	11-Dec-14	'
Expiration date of repurchase program	'	'	'	11-Dec-13	'