Carbo Ceramics (CRRTQ) 10-K 29 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 17, 2016	Jun. 30, 2015
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	CRR
Entity Registrant Name	CARBO CERAMICS INC
Entity Central Index Key	1,009,672
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		23,487,902
Entity Public Float			$ 704,247,341

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 78,866	$ 24,298
Trade accounts and other receivables, net	48,596	132,573
Inventories:
Finished goods	77,537	106,941
Raw materials and supplies	27,021	37,502
Total inventories	104,558	144,443
Prepaid expenses and other current assets	3,762	5,241
Prepaid income taxes		19,708
Deferred income taxes	49,495	11,348
Total current assets	285,277	337,611
Property, plant and equipment:
Land and land improvements	45,774	40,921
Land-use and mineral rights	19,877	19,877
Buildings	83,500	74,911
Machinery and equipment	642,396	627,517
Construction in progress	96,084	109,378
Total	887,631	872,604
Less accumulated depreciation and amortization	349,900	303,888
Net property, plant and equipment	537,731	568,716
Goodwill	3,500	12,164
Intangible and other assets, net	9,861	15,735
Total assets	836,369	934,226
Current liabilities:
Bank borrowings	33,000	25,000
Accounts payable	10,709	22,922
Accrued payroll and benefits	6,003	12,466
Accrued freight	3,068	5,925
Accrued utilities	2,414	3,714
Accrued income taxes	139
Derivative instruments	6,240
Other accrued expenses	8,717	7,388
Total current liabilities	70,290	77,415
Deferred income taxes	63,858	$ 80,754
Long-term portion of bank borrowings	55,000
Derivative instruments	$ 4,915
Shareholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none outstanding
Common stock, par value $0.01 per share, 80,000,000 shares authorized; 23,280,696 and 23,092,674 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 233	$ 231
Additional paid-in capital	65,067	59,297
Retained earnings	614,708	739,498
Accumulated other comprehensive loss	(37,702)	(22,969)
Total shareholders' equity	642,306	776,057
Total liabilities and shareholders' equity	$ 836,369	$ 934,226

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, share authorized	5,000	5,000
Preferred stock, share outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, share authorized	80,000,000	80,000,000
Common stock, share issued	23,280,696	23,092,674
Common stock, share outstanding	23,280,696	23,092,674

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 279,574	$ 648,325	$ 667,398
Cost of sales	335,699	467,045	474,403
Gross (loss) profit	(56,125)	181,280	192,995
Selling, general and administrative expenses	62,199	72,535	68,447
Start-up costs	797	811	0
Loss (gain) on disposal or impairment of assets, net	44,111	15,079	(43)
Operating (loss) profit	(163,232)	92,855	124,591
Other (expense) income:
Interest (expense) income, net	(470)	597	777
Foreign currency exchange gain (loss), net	94	(303)	(17)
Other, net	(141)	(278)	(150)
Nonoperating income (expense), total	(517)	16	610
(Loss) income before income taxes	(163,749)	92,871	125,201
Income tax (benefit) expense	(54,205)	37,283	40,315
Net (loss) income	$ (109,544)	$ 55,588	$ 84,886
(Loss) earnings per share:
Basic	$ (4.76)	$ 2.41	$ 3.67
Diluted	$ (4.76)	$ 2.41	$ 3.67

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net (loss) income	$ (109,544)	$ 55,588	$ 84,886
Other comprehensive loss:
Foreign currency translation adjustment	(5,880)	(17,952)	(2,031)
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation	(8,853)
Deferred income taxes		(1,756)	710
Other comprehensive loss, net of tax	(14,733)	(19,708)	(1,321)
Comprehensive (loss) income	$ (124,277)	$ 35,880	$ 83,565

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2012	$ 713,078	$ 231	$ 57,364	$ 657,423	$ (1,940)
Net income (loss)	84,886			84,886
Foreign currency translation adjustment, net of tax expense (benefit) of ($710) 2013, $1,756 2014	(1,321)				(1,321)
Comprehensive (loss) income	83,565
Tax (expense) benefit from stock based compensation	(205)		(205)
Stock granted under restricted stock plan, net	210	1	209
Stock based compensation	5,247		5,247
Shares repurchased and retired	(5,834)	(1)	(5,833)
Shares surrendered by employees to pay taxes	(1,124)			(1,124)
Cash dividends ($1.14 per share) 2013, ($1.26 per share) 2014, ($0.63 per share) 2015	(26,350)			(26,350)
Balances at Dec. 31, 2013	768,587	231	56,782	714,835	(3,261)
Net income (loss)	55,588			55,588
Foreign currency translation adjustment, net of tax expense (benefit) of ($710) 2013, $1,756 2014	(19,708)				(19,708)
Comprehensive (loss) income	35,880
Tax (expense) benefit from stock based compensation	303		303
Stock granted under restricted stock plan, net	700	1	699
Stock based compensation	6,688		6,688
Shares repurchased and retired	(5,176)	(1)	(5,175)
Shares surrendered by employees to pay taxes	(1,804)			(1,804)
Cash dividends ($1.14 per share) 2013, ($1.26 per share) 2014, ($0.63 per share) 2015	(29,121)			(29,121)
Balances at Dec. 31, 2014	776,057	231	59,297	739,498	(22,969)
Net income (loss)	(109,544)			(109,544)
Foreign currency translation adjustment, net of tax expense (benefit) of ($710) 2013, $1,756 2014	(14,733)
Foreign currency translation adjustment	(5,880)				(5,880)
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation	(8,853)				(8,853)
Comprehensive (loss) income	(124,277)
Tax (expense) benefit from stock based compensation	(1,768)		(1,768)
Stock granted under restricted stock plan, net	700	2	698
Stock based compensation	6,840		6,840
Shares surrendered by employees to pay taxes	(580)			(580)
Cash dividends ($1.14 per share) 2013, ($1.26 per share) 2014, ($0.63 per share) 2015	(14,666)			(14,666)
Balances at Dec. 31, 2015	$ 642,306	$ 233	$ 65,067	$ 614,708	$ (37,702)

CONSOLIDATED STATEMENTS OF SHA7

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Foreign currency translation adjustment, tax expense (benefit)		$ 1,756	$ (710)
Cash dividends, per share	$ 0.63	$ 1.26	$ 1.14

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net (loss) income	$ (109,544)	$ 55,588	$ 84,886
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	54,457	50,860	47,472
Provision for doubtful accounts	1,857	546	354
Deferred income taxes	(56,800)	24,389	10,121
Excess tax benefits from stock based compensation		(372)	(134)
Lower of cost or market adjustment	4,546	5,363
Loss (gain) on disposal or impairment of assets	44,111	15,079	(43)
Foreign currency transaction (gain) loss, net	(94)	303	17
Stock compensation expense	7,547	7,529	5,837
Loss on derivative instruments	11,155
Changes in operating assets and liabilities:
Trade accounts and other receivables	81,371	(9,511)	(22,024)
Inventories	27,022	(25,624)	6,068
Prepaid expenses and other current assets	1,437	(112)	(1,136)
Long-term other assets	697	(122)	2,969
Accounts payable	(7,861)	2,079	4,330
Accrued expenses	(9,104)	(2,487)	1,677
Accrued income taxes, net	19,780	(17,726)	(2,823)
Net cash provided by operating activities	70,577	105,782	137,571
Investing activities
Capital expenditures	(62,747)	(161,469)	(99,936)
Net cash used in investing activities	(62,747)	(161,469)	(99,936)
Financing activities
Proceeds from bank borrowings	70,000	25,000
Repayments on bank borrowings	(7,000)
Dividends paid	(14,666)	(29,121)	(26,350)
Purchase of common stock	(580)	(6,979)	(6,958)
Excess tax benefits from stock based compensation		372	134
Net cash provided by (used in) financing activities	47,754	(10,728)	(33,174)
Effect of exchange rate changes on cash	(1,016)	(3,537)	(846)
Net increase (decrease) in cash and cash equivalents	54,568	(69,952)	3,615
Cash and cash equivalents at beginning of year	24,298	94,250	90,635
Cash and cash equivalents at end of year	78,866	24,298	94,250
Supplemental cash flow information
Interest paid	$ 2,613	135	10
Income taxes paid		$ 30,619	$ 33,015

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Significant Accounting Policies	1. Significant Accounting Policies Description of Business CARBO Ceramics Inc. (the “Company”) was formed in 1987 and is a manufacturer of ceramic proppants and also produces resin-coated ceramic proppants. The Company has production plants in: New Iberia, Louisiana; Eufaula, Alabama; McIntyre, Georgia; Toomsboro, Georgia; Millen, Georgia; and Kopeysk, Russia; and a sand processing facility in Marshfield, Wisconsin. The Company predominantly sells its proppant products through pumping service companies that perform hydraulic fracturing for oil and gas companies. Finished goods inventories are stored at the plant sites and various domestic and international remote distribution facilities. The Company also provides the industry’s most widely used hydraulic fracture simulation software FracPro ® In late 2014 and early 2015, a severe decline in oil and natural gas prices led to a significant decline in oil and natural gas industry drilling activities and capital spending. Beginning in the three month period ended March 31, 2015, the Company implemented a number of initiatives to preserve cash and lower costs, including: reducing workforce across the organization, lowering production output levels in order to align with lower demand, limiting capital expenditures and reducing dividends. As a result of these measures, the Company temporarily idled production and furloughed employees at the Toomsboro and Millen, Georgia manufacturing plants for approximately 90 days and mothballed the manufacturing plant in McIntyre, Georgia. The manufacturing plant at Luoyang, China was shut down and is not expected to reopen. The Company incurred severance costs of $9,497 during 2015 as a result of these actions. Temporarily idled facilities are expected to remain closed for a short period of time, generally less than one year. Mothballed facilities are expected to remain closed for one year or longer. The accounting treatment is the same for both temporarily idled and mothballed facilities, except that mothballed assets are evaluated for possible impairment while temporarily idled assets are not necessarily assessed for impairment. The Company continues to depreciate both temporarily idled and mothballed assets. Production resumed at both of the temporarily idled facilities during the second quarter of 2015 at reduced levels. The facility in Toomsboro, Georgia is the Company’s largest manufacturing facility consisting of four production lines. During the course of 2015, the Toomsboro plant produced product on one to three of the four production lines. The Company again idled the Millen, Georgia facility during the fourth quarter of 2015. The plant in McIntyre, Georgia resumed production at low output levels in late 2015 but will again be mothballed during the first half of 2016. The Company continues to assess liquidity needs and manage cash flows and, if industry conditions do not improve and/or demand for its products does not otherwise increase, the Company would expect to temporarily idle all or a portion of our currently active facilities in the short term. Given continuing uncertainties with regards to the length of the industry downturn, the Company is evaluating alternative sources of capital, including modifications to its existing credit arrangement, although there can be no assurance that the Company will be able to obtain such financing or modifications on favorable terms, or at all. As a result of the steps the Company has taken to enhance its liquidity, the Company currently believes that cash on hand, cash flow from operations, borrowing capacity under its credit facility and cash flow from other liquidity-generating transactions will enable the Company to meet its working capital, capital expenditure, debt service and other funding requirements for the remainder of the year. Additionally, the Company suspended completion of two large construction projects until such time that market conditions improve enough to warrant completion. The two suspended projects include the second production line at Millen, Georgia and the second phase of the retrofit of an existing plant with the new KRYPTOSPHERE ® Principles of Consolidation The consolidated financial statements include the accounts of CARBO Ceramics Inc. and its operating subsidiaries. All significant intercompany transactions have been eliminated. Concentration of Credit Risk, Accounts Receivable and Other Receivables The Company performs periodic credit evaluations of its customers’ financial condition and generally does not require collateral. Receivables are generally due within 30 days. The majority of the Company’s receivables are from customers in the petroleum pressure pumping industry. The Company establishes an allowance for doubtful accounts based on its assessment of collectability risk and periodically evaluates the balance in the allowance based on a review of trade accounts receivable. Trade accounts receivable are periodically reviewed for collectability based on customers’ past credit history and current financial condition, and the allowance is adjusted if necessary. Credit losses historically have been insignificant. The allowance for doubtful accounts at December 31, 2015 and 2014 was $2,688 and $1,842, respectively. Other receivables were $300 and $1,084 as of December 31, 2015 and 2014, respectively, of which related mainly to miscellaneous receivables in the United States. Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The carrying amounts reported in the balance sheet for cash equivalents approximate fair value. Inventories Inventories are stated at the lower of cost (weighted average) or market. Finished goods inventories include costs of materials, plant labor and overhead incurred in the production of the Company’s products and costs to transfer finished goods to distribution centers. The Company evaluates the carrying value of its inventories relative to market value generally on a geographic by-country basis. As needed, more specific reviews within a particular country are made on a product group basis. Due to increasing competition in the China proppant market, the Company evaluated the carrying values of its inventories in China and concluded that market prices had fallen below carrying costs. Consequently, the Company recognized $4,546 and $5,363 lower of cost or market adjustments in cost of sales in 2015 and 2014, respectively, to adjust finished goods and raw materials carrying values to the lower market prices. Property, Plant and Equipment Property, plant and equipment are stated at cost. Repair and maintenance costs are expensed as incurred. Depreciation is computed on the straight-line method for financial reporting purposes using the following estimated useful lives: Buildings and improvements 15 to 30 years Machinery and equipment 3 to 30 years Land-use rights 30 years The Company holds approximately 4,618 acres of land and leasehold interests containing kaolin reserves near its plants in Georgia and Alabama. The Company also holds approximately 313 acres of land and leasehold interests containing sand reserves near its sand processing facility in Marshfield, Wisconsin. The capitalized costs of land and mineral rights as well as costs incurred to develop such property are amortized using the units-of-production method based on estimated total tons of these reserves. Impairment of Long-Lived Assets and Intangible Assets Long-lived assets to be held and used and intangible assets that are subject to amortization are reviewed for impairment whenever events or circumstances indicate their carrying amounts might not be recoverable. Recoverability is assessed by comparing the undiscounted expected future cash flows from the assets with their carrying amount. If the carrying amount exceeds the sum of the undiscounted future cash flows an impairment loss is recorded. The impairment loss is measured by comparing the fair value of the assets with their carrying amounts. Intangible assets that are not subject to amortization are tested for impairment at least annually by comparing their fair value with the carrying amount and recording an impairment loss for any excess of carrying amount over fair value. Fair values are generally determined based on discounted expected future cash flows or appraised values, as appropriate. For additional information on the Company’s long-lived assets and intangible assets impairment assessment, please refer to Note 4 – Impairment of Long-Lived Assets. Manufacturing Production Levels Below Normal Capacity As a result of the Company substantially reducing manufacturing production levels, including by idling and mothballing certain facilities, the component of the Company’s accounting policy for inventory relating to operating at production levels below normal capacity was triggered and resulted in certain production costs being expensed instead of being capitalized into inventory. The Company expenses fixed production overhead amounts in excess of amounts that would have been allocated to each unit of production at normal production levels. For the year ended December 31, 2015, the Company expensed $33,724 in production costs. There were no such costs in the prior year periods. Capitalized Software The Company capitalizes certain software costs, after technological feasibility has been established, which are amortized utilizing the straight-line method over the economic lives of the related products, generally not to exceed five years. Goodwill Goodwill represents the excess of the cost of companies acquired over the fair value of their net assets at the date of acquisition. Goodwill relating to each of the Company’s reporting units is tested for impairment annually, during the fourth quarter, as well as when an event, or change in circumstances, indicates an impairment is more likely than not to have occurred. For additional information on the Company’s goodwill impairment assessment, please refer to Note 4 – Impairment of Long-Lived Assets. Revenue Recognition Revenue from proppant sales is recognized when title passes to the customer, generally upon delivery. Revenue from consulting and geotechnical services is recognized at the time service is performed. Revenue from the sale of fracture simulation software is recognized when title passes to the customer at time of shipment. Revenue from the sale of spill prevention services is recognized at the time service is performed. Revenue from the sale of containment goods is recognized at the time goods are delivered. Shipping and Handling Costs Shipping and handling costs are classified as cost of sales. Shipping costs consist of transportation costs to deliver products to customers. Handling costs include labor and overhead to maintain finished goods inventory and operate distribution facilities. Cost of Start-Up Activities Start-up activities, including organization costs, are expensed as incurred. Start-up costs for 2015 related to the start-up of the first phase of a retrofit of an existing plant to produce KRYPTOSPHERE ® Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Research and Development Costs Research and development costs are charged to operations when incurred and are included in Selling, General and Administrative expenses. The amounts incurred in 2015, 2014 and 2013 were $7,047, $10,855 and $8,416, respectively. Foreign Subsidiaries Financial statements of the Company’s foreign subsidiaries are translated using current exchange rates for assets and liabilities; average exchange rates for the period for revenues, expenses, gains and losses; and historical exchange rates for equity accounts. Resulting translation adjustments are included in, and the only component of, Accumulated Other Comprehensive Loss as a separate component of shareholders’ equity. For additional information on the Company’s Cumulative Translation Adjustment, please refer to Note 18 – Foreign Currencies. New Accounting Pronouncements In November 2015, the FASB issued ASU 2015-17, “Income Taxes (Topic 740) – Balance Sheet Classification of Deferred Taxes,” (“ASU 2015-17”) which requires that deferred tax liabilities and assets be classified as noncurrent in the balance sheet. ASU 2015-17 will be effective for the interim and annual periods beginning after December 15, 2016 with early adoption permitted. The Company is currently evaluating the potential impact, if any, of adopting this new guidance on the consolidated financial statements and related disclosures. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606) – Deferral of the Effective Date,” which revises the effective date of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASU 2014-09”) to interim and annual periods beginning after December 15, 2017 with early adoption permitted no earlier than interim and annual periods beginning after December 15, 2016. In May 2014, the FASB issued ASU No. 2014-09, which amends current revenue guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is currently evaluating the potential impact, if any, of adopting this new guidance on the consolidated financial statements and related disclosures. In July 2015, the FASB issued ASU No. 2015-11, “Inventory (Topic 330),” In April 2015, the FASB issued ASU No. 2015-03, “Interest – Imputation of Interest (Subtopic 835-30),” “Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements – Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update)”, In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,”

Intangible and Other Assets

Intangible and Other Assets	12 Months Ended
	Dec. 31, 2015
Intangible and Other Assets	2. Intangible and Other Assets Following is a summary of intangible assets as of December 31: 2015 2014 Weighted Gross Accumulated Gross Accumulated Intangibles: Patents and licenses, software and hardware designs 6 years $ 4,754 $ 2,839 $ 4,222 $ 2,171 Developed technology 10 years 2,782 1,739 2,782 1,461 Customer relationships and non-compete 9 years 2,838 2,042 2,838 1,753 Trademark Indefinite — — 833 — $ 10,374 $ 6,620 $ 10,675 $ 5,385 Amortization expense for 2015, 2014 and 2013 was $1,235, $1,313 and $1,173, respectively. Estimated amortization expense for each of the ensuing years through December 31, 2020 is $915, $638, $565, $279 and $17, respectively. During 2015, the Company recognized an impairment of $833, the full value, relating to the Trademark. Following is a summary of other assets as of December 31: 2015 2014 Other assets: Bauxite raw materials: Inventories $ 4,145 $ 9,404 Other assets 1,962 1,041 $ 6,107 $ 10,445 Bauxite raw materials are used in the production of heavyweight ceramic products. As of December 31, 2015 and 2014, the Company has classified as long-term assets those bauxite raw materials inventories that are not expected to be consumed in production during the upcoming twelve month period. For additional information, refer to Note 4 – Impairment of Long-Lived Assets.

Bank Borrowings

Bank Borrowings	12 Months Ended
	Dec. 31, 2015
Bank Borrowings	3. Bank Borrowings The Company has a revolving credit agreement with a bank. On July 27, 2015, the Company entered into a fourth amendment to this credit facility that, among other items, (i) reduced the size of the revolving credit facility from $100,000 to $90,000; (ii) secures borrowings with a blanket lien on substantially all of the Company’s accounts receivable and inventories; (iii) prohibits the Company from granting security interests in the Company’s fixed assets and real property; (iv) sets interest at LIBOR plus 4.00%; (v) sets the maturity date as December 31, 2018; and (vi) waives compliance with the maximum leverage ratio and fixed charge ratio covenants through December 31, 2016. Additionally, the fourth amendment added covenants which (i) requires a minimum assets coverage ratio of 1.25 to 1.0 calculated on a monthly basis and (ii) limits capital expenditures to $65,000 annually through December 31, 2016, subject to maintaining pro forma liquidity of $15,000. Our credit facility also allows for the issuance of up to $9,500 in standby letters of credit, of which $8,875 was issued as of December 31, 2015, primarily as collateral relating to our natural gas commitments. The terms of the credit agreement provide for certain affirmative and negative covenants and require the Company to maintain certain financial ratios. Commitment fees are payable quarterly at an annual rate between 0.375% and 0.50% of the unused line of credit. Commitment fees for 2015, 2014 and 2013 were $75, $207 and $154, respectively. Interest cost for 2015, 2014 and 2013 was $2,973, $135, and $10, respectively, of which $2,038 was capitalized into the cost of property, plant and equipment in 2015. No interest cost was capitalized in 2014 and 2013. As of December 31, 2015, the Company’s outstanding debt under the credit agreement was $88,000 of which $33,000 was classified as current and $55,000 was classified as long-term. The weighted average interest rate was 4.664% based on LIBOR-based rate borrowings. As of December 31, 2014, the Company’s outstanding debt under the credit agreement was $25,000 and the weighted average interest rate was 2.625% based on LIBOR-based rate borrowings. As of December 31, 2015, the Company was in compliance with its debt covenants. As of January 31, 2016, we were in breach of the asset coverage ratio covenant (which requires a ratio of certain assets to total debt of at least 1.25). Our asset coverage ratio as of January 31, 2016 was 1.21. In order to cure this breach, the Company repaid $16,100 of borrowings under the credit facility in February 2016. As of February 26, 2016, the Company’s outstanding debt under the credit agreement was $71,900. Depending on the duration and severity of the industry downturn, there is a risk that the Company may again not be in compliance with certain of the financial covenants under its existing credit agreement. Such a breach would constitute an event of default under the Company’s credit agreement if it remained uncured or a modification or waiver is not agreed to with its lender. In the event of non-compliance and if the Company is unable to secure waivers or modifications to the existing credit agreement or alternative sources of capital, it is possible that the Company may not have the liquidity sufficient to meet operating expenses, capital expenditures and other cash needs. Given continuing uncertainties with regards to the length of the industry downturn, the Company is evaluating alternative sources of capital, including modifications to its existing credit agreement, although there can be no assurance that the Company will be able to obtain such financing or modifications on favorable terms, or at all.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets	12 Months Ended
	Dec. 31, 2015
Impairment of Long-Lived Assets	4. Impairment of Long-Lived Assets During 2015 and 2014, the Company recorded losses totaling $43,697 and $15,120, respectively, on impairment of certain long-lived assets as market conditions changed with regard to demand for certain products offered by the Company. A decline in oil and natural gas prices during the second half of 2014 resulted in a severe decline in market conditions beginning in early 2015. As a result, the Company temporarily idled production and furloughed employees at the Toomsboro and Millen, Georgia manufacturing plants for approximately 90 days and mothballed the manufacturing plant in McIntyre, Georgia. At the time the manufacturing facility in McIntyre, Georgia was mothballed, the Company conducted an interim impairment analysis of the related long-lived assets, with the primary assumption that the plant would resume production after two years and return to production levels at normal capacity within four years. Pursuant to that analysis, the Company determined that the projected gross cash flows attributable to the facility substantially exceed the carrying value of the assets; therefore, the Company concluded that there was no impairment. The Company did not assess the temporarily idled facilities for impairment because such short-term stoppages of production for less than one year would not significantly impact the long-term expected cash flows of the idled facilities. During the fourth quarter of 2015, industry conditions further deteriorated as oil prices fell below $30 per barrel. As a result of these worsening conditions, the Company evaluated substantially of all its long-lived assets for possible impairment as of December 31, 2015. Key assumptions used in the analysis varied by facility. However, the overriding assumptions included: 1) the industry downturn would last longer than originally anticipated, taking up to five years to fully recover; 2) production levels would rise over the recovery period eventually returning to production levels within normal capacity; 3) market pricing would be similar to lower 2015 levels, thus conservatively reducing expected gross profit and thus cash flows; 4) the Company’s wet process manufacturing plants (Toomsboro and Millen, Georgia and Eufaula Alabama) were evaluated as a group of assets because these facilities manufacture like products; and 5) other facilities were separately evaluated. Pursuant to that analysis, the Company determined that the projected gross cash flows attributable to certain assets did not exceed the carrying value of the assets; therefore, the Company concluded that there was indication of possible impairment. The Company engaged the services of a third party consulting firm to assist with the determination of the fair market value of the related assets and concluded that the assets were impaired. The key assumptions and inputs impacting the fair value analysis were the weighted average cost of capital and perpetuity growth rate as well as certain market data with respect to the property and equipment at each facility. As a result, the Company recorded a $36,177 impairment of long-lived assets, primarily relating to machinery and equipment at the McIntyre, Georgia manufacturing plant and Marshfield, Wisconsin sand processing facility. Related to the impairment evaluation and resulting impairment loss regarding the McIntyre, Georgia manufacturing plant, the Company also evaluated the carrying value of the long-term portion of bauxite raw materials. Much of the bauxite raw material was intended for use in production at the McIntyre facility. Based upon this evaluation, during 2015, the Company recognized an impairment charge of $6,488 on the long-term portion of the bauxite raw material inventories. Market conditions inside China deteriorated somewhat earlier relative to conditions in the United States. As a result of deteriorating market conditions in China during the fourth quarter of 2014, the Company recorded a $10,164 impairment of its long-lived assets in China during that period. As a result of the further deterioration of conditions in 2015, the Company ceased production activities at its Luoyang, China manufacturing plant. During the course of 2015, the Company released substantially all of its employees inside China, sold off inventories and proceeded to wind-down the operation. The Company does not intend to resume operations in China. During the fourth quarter of 2015, the Company incurred a loss of $1,033 related to the write-off of abandoned inventories and other assets, and substantially liquidated the China assets and liabilities, as defined by U.S generally accepted accounting principles. As a result, the foreign currency cumulative translation gain of $8,853 was released into the statement of operations and is netted with other impairment losses. The Company anticipates in the near term commencing the process to legally dissolve the entity, which is expected to be completed by the end of 2016. In addition, during late 2014, the Company made a decision that it will not move forward with construction of a resin coating plant in Marshfield, Wisconsin for which the Company had previously developed engineering plans and procured certain equipment that had long-lead delivery times. As such, the Company recorded a $4,956 impairment of those assets during the year ended December 31, 2014. There were no such impairments during 2013. The Company assesses goodwill for possible impairment annually or sooner if circumstances indicate possible impairment may have occurred. The Company evaluated goodwill during the fourth quarter, and as a result of the further decline in the oil and natural gas industry during the fourth quarter of 2015, concluded that Falcon projected future cash flows were negatively impacted and thus indicated possible impairment of the Falcon goodwill. The Company engaged a third party to assist in the evaluation and concluded that impairment had occurred. Fair value, which was determined using a discounted cash flows method, fell below the carrying value. Consequently, the Company recorded an $8,664 impairment of Falcon goodwill and an $833 impairment of the indefinite-lived Falcon Trademark intangible asset, both the full value of each of those assets. Evaluation of the StrataGen goodwill resulted in no indication of possible impairment. There were no such impairments during 2014 or 2013. During the years ended December 31, 2015, 2014, and 2013, the Company recognized gains of $230, $41, and $43 on disposal of various assets. Components of loss (gain) on disposal or impairment of assets are as follows: For the years ended December 31, 2015 2014 2013 Domestic long-lived assets impairment $ 42,664 $ 4,956 $ — China assets impairment 1,033 10,164 — Goodwill and intangible assets impairment 9,497 — — China CTA gain realization (8,853 ) — — Gain on disposal of assets (230 ) (41 ) (43 ) Total $ 44,111 $ 15,079 $ (43 )

Leases

Leases	12 Months Ended
	Dec. 31, 2015
Leases	5. Leases The Company leases certain property, plant and equipment under operating leases, primarily consisting of railroad equipment leases. Net minimum future rental payments due under non-cancelable operating leases with remaining terms in excess of one year as of December 31, 2015 are as follows: 2016 $ 17,197 2017 19,445 2018 17,396 2019 14,519 2020 14,102 Thereafter 49,555 Total $ 132,214 Leases of railroad equipment generally provide for renewal options at their fair rental value at the time of renewal. In the normal course of business, operating leases for railroad equipment are generally renewed or replaced by other leases. For the years ended December 31, 2016, 2017 and 2018, minimum future rental payments in the table above are presented net of sublease income related to subleases of railroad equipment of $4,872, $301 and $71, respectively. Rent expense for all operating leases was $23,757 in 2015, $24,116 in 2014 and $22,542 in 2013. For the years ended December 31, 2015, 2014 and 2013, rent expense is stated net of sublease income of $5,031, $1,816 and $208, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Taxes	6. Income Taxes Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities as of December 31 are as follows: 2015 2014 Deferred tax assets: Employee benefits $ 1,296 $ 1,440 Inventories 7,071 6,966 Natural gas derivatives 4,183 — Goodwill 3,980 874 Net Operating Loss 39,360 — Other 1,723 2,942 Foreign losses 1,230 4,300 Foreign tax assets valuation allowance (1,230 ) (4,300 ) Total deferred tax assets 57,613 12,222 Deferred tax liabilities: Depreciation 71,976 81,628 Total deferred tax liabilities 71,976 81,628 Net deferred tax liabilities $ 14,363 $ 69,406 Significant components of the provision for income taxes for the years ended December 31 are as follows: 2015 2014 2013 Current: Federal $ 1,509 $ 11,310 $ 27,188 State 120 500 2,164 Foreign 966 1,084 842 Total current 2,595 12,894 30,194 Deferred (56,800 ) 24,389 10,121 $(54,205) $ 37,283 $ 40,315 The reconciliation of income taxes computed at the U.S. statutory tax rate to the Company’s income tax expense for the years ended December 31 is as follows: 2015 2014 2013 Amount Percent Amount Percent Amount Percent U.S. statutory rate $ (57,312 ) (35.0 )% $ 32,505 35.0 % $ 43,820 35.0 % State income taxes, net of federal tax benefit (3,474 ) (2.1 ) 1,882 2.0 2,097 1.7 Mining depletion (1,557 ) (0.9 ) (3,035 ) (3.3 ) (2,751 ) (2.2 ) Change in election to deduct foreign taxes paid 1,442 0.9 — — — — Foreign tax assets valuation allowance 1,230 0.7 4,300 4.6 — — Non-recognized benefit on foreign investments 847 0.5 2,980 3.2 — — Section 199 Manufacturing Benefit and other 4,619 2.8 (1,349 ) (1.4 ) (2,851 ) (2.3 ) $ (54,205 ) (33.1 )% $ 37,283 40.1 % $ 40,315 32.2 % Provision has been made for deferred U.S. income taxes on all foreign earnings based on the Company’s intent to repatriate foreign earnings. During the years ended December 31, 2015 and 2014, the Company did not recognize benefits on foreign investments of $847 and $2,980, respectively, and recorded valuation allowances of $1,230 and $4,300, respectively, due to the uncertainty of the Company being able to realize the foreign tax assets in light of current market conditions in China. During 2015, the Company incurred a net operating loss in the United States. The tax benefit of this net operating loss totals $39,360 and is included in the deferred income tax asset. The Company intends to file amended 2013 and 2014 Federal income tax returns to claim refunds and thus realize this income tax benefit. Upon filing the amended Federal tax returns, approximately $36,800 of the tax benefit will become a current income tax receivable and is expected to be refunded during the first half of 2016. Amended state income tax returns will be filed later during 2016 to claim refunds associated with carryback of net operating losses. The Company elected to claim bonus tax depreciation totaling $29,221 and $61,781 on assets placed in service in the United States during 2015 and 2014, respectively. This election increased the net operating loss in 2015 and reduced current taxable income in 2014. The Company did not claim bonus depreciation on assets placed in service during 2013. The Company had a recorded reserve of $153 associated with uncertain tax positions as of December 31, 2015 and there were no significant changes to the recorded reserve during 2015. If these uncertain tax positions are recognized, substantially all of this amount would impact the effective tax rate. Related accrued interest and penalties are recorded in income tax expense and are not material. The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates, the most significant of which are U.S. federal and certain state jurisdictions. The 2012 and subsequent tax years are still subject to examination. Various U.S. state jurisdiction tax years remain open to examination as well though the Company believes assessments, if any, would be immaterial to its consolidated financial statements.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2015
Shareholders' Equity	7. Shareholders’ Equity Common Stock Holders of Common Stock are entitled to one vote per share on all matters to be voted on by shareholders and do not have cumulative voting rights. Subject to preferences of any Preferred Stock, the holders of Common Stock are entitled to receive ratably such dividends, if any, as may be declared from time to time by the Board of Directors out of funds legally available for that purpose. In the event of liquidation, dissolution or winding up of the Company, holders of Common Stock are entitled to share ratably in all assets remaining after payment of liabilities, subject to prior distribution rights of any Preferred Stock then outstanding. The Common Stock has no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the Common Stock. All outstanding shares of Common Stock are fully paid and non-assessable. On January 19, 2016, the Board of Directors suspended the Company’s policy of paying quarterly cash dividends. Preferred Stock The Company’s charter authorizes 5,000 shares of Preferred Stock. The Board of Directors has the authority to issue Preferred Stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof, including dividend rights, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences and the number of shares constituting any series or the designation of such series, without further vote or action by the Company’s shareholders. Common Stock Repurchase Program On January 28, 2015, the Company’s Board of Directors authorized the repurchase of up to two million shares of the Company’s common stock. Shares are effectively retired at the time of purchase. As of December 31, 2015, the Company had not repurchased any shares under the plan.

Natural Gas Derivative Instrume

Natural Gas Derivative Instruments	12 Months Ended
	Dec. 31, 2015
Natural Gas Derivative Instruments	8. Natural Gas Derivative Instruments Natural gas is used to fire the kilns at the Company’s domestic manufacturing plants. In an effort to mitigate potential volatility in the cost of natural gas purchases and reduce exposure to short-term spikes in the price of this commodity, from time to time, the Company enters into contracts to purchase a portion of the anticipated monthly natural gas requirements at specified prices. Contracts are geographic by plant location. Historically, the Company has taken delivery of all natural gas quantities under contract, which exempted the Company from accounting for the contracts as derivative instruments. However, due to the severe decline in industry activity in early 2015, the Company significantly reduced production levels and consequently did not take delivery of all of the contracted natural gas quantities. As a result, the Company began to account for relevant contracts as derivative instruments. Derivative accounting requires the natural gas contracts to be recognized as either assets or liabilities at fair value with an offsetting entry in earnings. The Company uses the income approach in determining the fair value of these derivative instruments. The model used considers the difference, as of each balance sheet date, between the contracted prices and the New York Mercantile Exchange (“NYMEX”) forward strip price for each contracted period. The estimated cash flows from these contracts are discounted using a discount rate of 5.5%, which reflects the nature of the contracts as well as the timing and risk of estimated cash flows associated with the contracts. The discount rate had an immaterial impact on the fair value of the contracts for the year ended December 31, 2015. The last natural gas contract will expire in December 2018. As a result, during the year ended December 31, 2015, the Company recognized a loss on derivative instruments of $15,040 in cost of sales. The cumulative present value of the losses on these natural gas derivative contracts as of December 31, 2015 are presented as current and long-term liabilities, as applicable, in the Consolidated Balance Sheet. At December 31, 2015, the Company has contracted for delivery a total of 7,920,000 MMBtu of natural gas at an average price of $4.48 per MMBtu through December 31, 2018. Contracts covering 6,600,000 MMBtu are subject to accounting as derivative instruments. Future decreases in the NYMEX forward strip prices will result in additional derivative losses while future increases in the NYMEX forward strip prices will result in derivative gains. Future gains or losses will approximate the change in NYMEX natural gas prices relative to the total quantity of natural gas under contracts now subject to accounting as derivatives. The historical average NYMEX natural gas contract settlement prices for the years ended December 31, 2015 and 2014 were $2.66 per MMBtu and $4.41 per MMBtu, respectively.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Measurements	9. Fair Value Measurements The Company’s derivative instruments are measured at fair value on a recurring basis. U.S. GAAP establishes a fair value hierarchy that has three levels based on the reliability of the inputs used to determine the fair value. These levels include: Level 1, defined as inputs such as unadjusted quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for use when little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company’s natural gas derivative instruments are included within the Level 2 fair value hierarchy. For additional information on the derivative instruments, refer to Note 8 – Natural Gas Derivative Instruments. The Company’s impaired long-lived assets primarily relating machinery and equipment at its McIntyre, Georgia ceramic proppant manufacturing facility and its Marshfield, Wisconsin sand processing plant are included within the Level 3 fair value hierarchy. The fair value measurements used in those impairment evaluations were based on discounted cash flow estimates using unobservable inputs and certain other market data. For additional information, refer to Note 4 – Impairment of Long-Lived Assets. The following table sets forth by level within the fair value hierarchy the Company’s assets and liabilities that were accounted for at fair value: Fair value as of December 31, 2015 Level 1 Level 2 Level 3 Total Assets: Impaired long-lived assets $ — $ — $ 5,896 $ 5,896 Liabilities: Derivative instruments — (11,155 ) — (11,155 ) Total fair value $ — $ (11,155 ) $ 5,896 $ (5,259 ) Fair value as of December 31, 2014 Level 1 Level 2 Level 3 Total Assets: Impaired long-lived assets $ — $ — $ 2,138 $ 2,138 Liabilities: Derivative instruments — — — — Total fair value $ — $ — $ 2,138 $ 2,138 At December 31, 2015, the fair value of the Company’s bank borrowings approximated the carrying value.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2015
Stock Based Compensation	10. Stock Based Compensation On May 20, 2014, the shareholders approved the 2014 CARBO Ceramics Inc. Omnibus Incentive Plan (the “2014 Omnibus Incentive Plan”). The 2014 Omnibus Incentive Plan replaces the expired 2009 Omnibus Incentive Plan. Under the 2014 Omnibus Incentive Plan, the Company may grant cash-based awards, stock options (both non-qualified and incentive) and other equity-based awards (including stock appreciation rights, phantom stock, restricted stock, restricted stock units, performance shares, deferred share units or share-denominated performance units) to employees and non-employee directors. The amount paid under the 2014 Omnibus Incentive Plan to any single participant in any calendar year with respect to any cash-based award shall not exceed $5,000. Awards may be granted with respect to a number of shares of the Company’s Common Stock that in the aggregate does not exceed 750,000 shares prior to the fifth anniversary of its effective date, plus (i) the number of shares that are forfeited, cancelled or returned, and (ii) the number of shares that are withheld from the participants to satisfy an option exercise price or minimum statutory tax withholding obligations. No more than 50,000 shares may be granted to any single participant in any calendar year. Equity-based awards may be subject to performance-based and/or service-based conditions. With respect to stock options and stock appreciation rights granted, the exercise price shall not be less than the market value of the underlying Common Stock on the date of grant. The maximum term of an option is ten years. Restricted stock awards granted generally vest (i.e., transfer and forfeiture restrictions on these shares are lifted) proportionately on each of the first three anniversaries of the grant date, but subject to certain limitations, awards may specify other vesting periods. As of December 31, 2015, 526,563 shares were available for issuance under the 2014 Omnibus Incentive Plan. Although the Company’s 2009 Omnibus Incentive Plan has expired, certain unvested shares granted under that plan remain outstanding in accordance with its terms. Additionally, certain units of phantom stock remain outstanding under the 2009 Omnibus Incentive Plan, as described below. A summary of restricted stock activity and related information for the year ended December 31, 2015 is presented below: Shares Weighted- Grant-Date Nonvested at January 1, 2015 147,489 $ 99.51 Granted 225,487 $ 34.62 Vested (70,089 ) $ 98.59 Forfeited (36,735 ) $ 51.62 Nonvested at December 31, 2015 266,152 $ 51.39 As of December 31, 2015, there was $8,057 of total unrecognized compensation cost, net of estimated forfeitures, related to restricted shares granted under the Omnibus Incentive Plans. That cost is expected to be recognized over a weighted-average period of 1.8 years. The weighted-average grant date fair value of restricted stock granted during the years ended December 31, 2015, 2014 and 2013 was $34.62, $111.99 and $82.18, respectively. The total fair value of shares vested during the years ended December 31, 2015, 2014 and 2013 was $6,910, $5,638 and $4,995, respectively. As of December 31, 2015, the Company’s outstanding market-based cash awards to certain executives of the Company had a total Target Award of $753. The amount of awards that will ultimately vest can range from 0% to 200% based on the Company’s Relative Total Shareholder Return calculated over a three year period beginning January 1, 2015 through December 31, 2017. The Company also made phantom stock awards to key international employees pursuant to the expired 2009 Omnibus Incentive Plan prior to its expiration and pursuant to the 2014 Omnibus Incentive Plan. The units subject to an award vest and cease to be forfeitable in equal annual installments over a three-year period. Participants awarded units of phantom stock are entitled to a lump sum cash payment equal to the fair market value of a share of Common Stock on the vesting date. In no event will Common Stock of the Company be issued with regard to outstanding phantom stock awards. As of December 31, 2015, there were 18,180 units of phantom stock granted under the expired 2009 Omnibus Incentive Plan, of which 12,569 have vested and 3,904 have been forfeited. As of December 31, 2015, there were 5,020 units of phantom stock granted under the 2014 Omnibus Incentive Plan, of which none have vested and 1,110 have been forfeited. As of December 31, 2015, nonvested units of phantom stock under the 2009 Omnibus Incentive Plan and the 2014 Omnibus Incentive Plan have a total value of $97, a portion of which is accrued as a liability within Accrued Payroll and Benefits.

(Loss) Earnings Per Share

(Loss) Earnings Per Share	12 Months Ended
	Dec. 31, 2015
(Loss) Earnings Per Share	11. (Loss) Earnings Per Share ASC Topic 260, “ Earnings Per Share The following table sets forth the computation of basic and diluted (loss) earnings per share under the two-class method: 2015 2014 2013 Numerator for basic and diluted (loss) earnings per share: Net (loss) income $ (109,544 ) $ 55,588 $ 84,886 Effect of reallocating undistributed earnings of participating securities — (376 ) (530 ) Net (loss) income available under the two-class method $ (109,544 ) $ 55,212 $ 84,356 Denominator: Denominator for basic (loss) earnings per share—weighted-average shares 22,999,318 22,946,395 22,957,013 Effect of dilutive potential common shares — — — Denominator for diluted (loss) earnings per share—adjusted weighted-average shares 22,999,318 22,946,395 22,957,013 Basic (loss) earnings per share $ (4.76 ) $ 2.41 $ 3.67 Diluted (loss) earnings per share $ (4.76 ) $ 2.41 $ 3.67

Quarterly Operating Results--(U

Quarterly Operating Results--(Unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Operating Results--(Unaudited)	12. Quarterly Operating Results––(Unaudited) Quarterly results for the years ended December 31, 2015 and 2014 were as follows: Three Months Ended March 31 June 30 September 30 December 31 2015 Revenues $ 73,747 $ 73,752 $ 75,807 $ 56,768 Gross loss (25,998 ) (10,302 ) (4,597 ) (15,228 ) Net loss (28,602 ) (17,004 ) (13,898 ) (50,040 ) Loss per share: Basic $ (1.24 ) $ (0.74 ) $ (0.60 ) $ (2.17 ) Diluted $ (1.24 ) $ (0.74 ) $ (0.60 ) $ (2.17 ) 2014 Revenues $ 148,564 $ 176,561 $ 155,402 $ 167,798 Gross profit 44,364 53,648 42,150 41,118 Net income 18,427 23,017 13,744 399 Earnings per share: Basic $ 0.80 $ 1.00 $ 0.60 $ 0.02 Diluted $ 0.80 $ 1.00 $ 0.60 $ 0.02 Quarterly data may not sum to full year data reported in the Consolidated Financial Statements due to rounding.

Sales to Customers

Sales to Customers	12 Months Ended
	Dec. 31, 2015
Sales to Customers	13. Sales to Customers The following schedule presents customers from whom the Company derived 10% or more of total revenues for the years ended December 31: Major Customers A B 2015 10.7 % 26.9 % 2014 22.4 % 29.9 % 2013 13.1 % 34.7 %

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2015
Geographic Information	14. Geographic Information Long-lived assets, consisting of net property, plant and equipment and other long-term assets, as of December 31 in the United States and other countries are as follows: 2015 2014 2013 Long-lived assets: United States $ 531,518 $ 561,109 $ 454,031 International 12,320 18,052 35,372 Total $ 543,838 $ 579,161 $ 489,403 Long-lived international assets in 2013 are primarily associated with China and Russia. During 2014, the Company recorded an impairment of long-lived assets in China. Consequently, long-lived international assets in 2014 and 2015 are primarily associated with Russia and Canada. Revenues outside the United States accounted for 29%, 24% and 21% of the Company’s revenues for 2015, 2014 and 2013, respectively. Revenues for the years ended December 31 in the United States, Canada and other countries are as follows: 2015 2014 2013 Revenues: United States $ 199,187 $ 491,004 $ 529,603 Canada 33,614 73,092 43,329 Other international 46,773 84,229 94,466 Total $ 279,574 $ 648,325 $ 667,398

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2015
Benefit Plans	15. Benefit Plans The Company has defined contribution savings and profit sharing plans pursuant to Section 401(k) of the Internal Revenue Code. Benefit costs recognized as expense under these plans consisted of the following for the years ended December 31: 2015 2014 2013 Contributions: Profit sharing $ — $ 2,337 $ 2,126 Savings 1,547 1,849 1,609 $ 1,547 $ 4,186 $ 3,735 All contributions to the plans are 100% participant directed. Participants are allowed to invest up to 20% of contributions in the Company’s Common Stock.

Commitments

Commitments	12 Months Ended
	Dec. 31, 2015
Commitments	16. Commitments In January 2011, the Company entered into an agreement with one of the Company’s existing suppliers to purchase from the supplier at least 70 percent of the annual kaolin requirements for the Eufaula plant at specified contract prices. The term of the agreement was three years, with options to extend for an additional six years. In May 2012, the agreement was amended to require the Company to purchase from the supplier at least 50 percent of the annual kaolin requirements for the Eufaula, Alabama plant at specified contract prices for the remainder of 2012 and the ensuing five calendar years. The agreement has options to extend the term for an additional three years. For the years ended December 31, 2015, 2014 and 2013, the Company purchased from the supplier $2,380, $2,263 and $3,788, respectively, of kaolin under the agreement. In January 2003, the Company entered into a mining agreement with a contractor to provide kaolin for the Company’s McIntyre plant at specified contract prices, from lands owned or leased by either the Company or the contractor. The term of the agreement, which commenced on January 1, 2003, and remains in effect until such time as all Company-owned minerals have been depleted, previously required the Company to accept delivery from the contractor of at least 80 percent of the McIntyre plant’s annual kaolin requirements. In 2006, the Company’s plant in Toomsboro, Georgia commenced operations and became part of this agreement. In November 2015, the agreement was amended to require the Company to accept delivery from the contractor of 100 percent of the annual kaolin requirements for the plants in McIntyre and Toomsboro. For the years ended December 31, 2015, 2014 and 2013, the Company purchased $3,245, $14,823 and $13,091, respectively, of kaolin under the agreement. In July 2011, the Company entered into an agreement with a supplier to provide hydro sized sand for the Company’s Marshfield, Wisconsin plant at a specified contract price. The term of the agreement was five years commencing on July 30, 2011 and required the Company to purchase a minimum of 40,000 tons and 100,000 tons of hydro sized sand during 2011 and 2012, respectively. Effective January 30, 2012, the agreement was amended and requires the Company to purchase a minimum of 150,000 tons of hydro sized sand annually during 2012 and 2013 and a minimum of 350,000 tons of hydro sized sand in 2014, all at a stated contract price. There were no purchase commitments required during 2015 or through the end of the agreement. For the years ended December 31, 2015, 2014 and 2013, the Company purchased $3,997, $6,922, and $3,546, respectively, of sand under this agreement. In May 2012, the Company entered into a supply agreement to provide kaolin for the Company’s manufacturing plant in Millen, Georgia at specified contract prices, from lands owned or leased by either the Company or the contractor. The term of the agreement, which commenced in July 2014, has an initial term of five years with options to extend for an additional five years and requires the Company to accept delivery from the contractor of at least 50 percent of the Millen plant’s annual kaolin requirements. For the years ended December 31, 2015 and 2014, the Company purchased $561 and $1,465, respectively, of kaolin under this agreement. In October 2014, the Company entered into an agreement with a supplier to mine kaolin and process into a slurry for the Company’s manufacturing plant in Millen, Georgia at specified contract prices. The term of the agreement was five years with automatic two (2) year extensions and requires the Company to source at least 50 percent of the Millen plant’s annual slurry requirement from the supplier. For the years ended December 31, 2015 and 2014, the Company purchased $1,300 and $577, respectively, of slurry under this agreement. In November 2014, the Company entered into an agreement with a supplier to provide frac sand for the Company’s Marshfield, Wisconsin plant at a specified contract price. The term of the agreement, which commenced on November 13, 2014, remains in effect until the specified sand is depleted and required the Company to purchase a minimum of 300,000 tons of frac sand during 2015 and 400,000 tons of frac sand for each year thereafter. Effective October 12, 2015, the Company entered into a Letter Agreement with the supplier resulting in the adjustment of required annual minimum purchased tons of frac sand to 123,203 and 116,599 for years 2015 and 2016, respectively. The minimum frac sand purchase requirements of 400,000 tons for years 2017 and thereafter until the specified sand is depleted remains unchanged. For the year ended December 31, 2015, the Company purchased $1,751 of frac sand under this agreement. The Company has entered into a lease agreement dated November 1, 2008 with the Development Authority of Wilkinson County (the “Wilkinson County Development Authority”) and a lease agreement dated November 1, 2012 with the Development Authority of Jenkins County (the “Jenkins County Development Authority” and together with the Wilkinson County Development Authority, the “Development Authorities”) each in the State of Georgia. Pursuant to the 2008 agreement, the Wilkinson County Development Authority holds the title to the real and personal property of the Company’s McIntyre and Toomsboro manufacturing facilities and leases the facilities to the Company for an annual rental fee of $50 per year through November 1, 2017, and includes a Company renewal option to extend through November 1, 2021. Pursuant to the 2012 agreement, the Jenkins County Development Authority holds title to the real estate and personal property of the Company’s Millen, Georgia manufacturing facility, and leases the facility to the Company until the tenth anniversary of completion of the final phase of the facility. At any time prior to the scheduled termination of either lease, the Company has the option to terminate the lease and purchase the property for a nominal fee plus the payment of any rent payable through the balance of the lease term. Furthermore, the Company has security interests in the titles held by the Development Authorities. The Company has also entered into a Memorandum of Understanding (the “MOU”) with the Development Authorities and other local agencies, under which the Company receives tax incentives in exchange for its commitment to invest in the county and increase employment. The MOU with the Jenkins County Development Authority also requires the Company to pay an administrative payment of $50 per year during the term of the Millen lease. The Company is required to achieve certain employment levels in order to retain its tax incentives. In the event the Company does not meet the agreed-upon employment targets or the MOU is otherwise terminated, the Company would be subjected to additional property taxes annually. Based on adverse economic conditions beyond the Company’s control that negatively impacted employment levels, a notice dated December 1, 2015 sent by the Company to the Development Authority of Jenkins County declared a force majeure, which suspended employment levels defined in the original agreement and preserved tax incentives until further notification of the restart of plant operations. The suspension period defined in the amended agreement cannot extend beyond January 1, 2021. Based on adverse economic conditions beyond the Company’s control that negatively impacted employment levels, a notice dated February 1, 2016 sent by the Company to the Development Authority of Wilkinson County declared a force majeure, which suspended employment levels defined in the original agreement and preserved tax incentives until further notification of the restart of plant operations. The properties subject to these lease agreements are included in Property, Plant and Equipment (net book value of $316,458 at December 31, 2015) in the accompanying consolidated financial statements.

Employment Agreements

Employment Agreements	12 Months Ended
	Dec. 31, 2015
Employment Agreements	17. Employment Agreements The Company has an employment agreement through December 31, 2016 with its President and Chief Executive Officer. The agreement provides for an annual base salary and incentive bonus. If the President and Chief Executive Officer is terminated early without cause, the Company will be obligated to pay two years base salary and a prorated incentive bonus. Under the agreement, the timing of the payment of severance obligations to the President in the event of the termination of his employment under certain circumstances has been conformed so that a portion of such obligations will be payable in a lump sum, with the remainder of the obligations to be paid over an 18 month period. The agreement also contains a two-year non-competition covenant that would become effective upon termination for any reason. The employment agreement extends automatically for successive one-year periods without prior written notice.

Foreign Currencies

Foreign Currencies	12 Months Ended
	Dec. 31, 2015
Foreign Currencies	18. Foreign Currencies As of December 31, 2015, the Company’s net investment that is subject to foreign currency fluctuations totaled $16,559, and the Company has recorded a cumulative foreign currency translation loss of $37,702, all related to Russia. This cumulative translation loss is included in and is the only component of accumulated other comprehensive loss within shareholders’ equity. As a result of the substantial liquidation of China assets and liabilities in 2015, the Company reclassified an $8,853 cumulative translation adjustment gain, with no tax impact, from accumulated other comprehensive loss to loss (gain) on disposal or impairment of assets within the statement of operations during the year ended December 31, 2015. For additional information, refer to Note 4 – Impairment of Long-Lived Assets. During 2014 and continuing into 2015, the value of the Russian Ruble significantly declined relative to the U.S. dollar for which the financial impact on the Company’s net assets in Russia is included in other comprehensive income and the cumulative foreign currency translation loss noted above. No income tax benefits have been recorded on these losses as a result of the uncertainty about recoverability of the related deferred income tax benefits.

Legal Proceedings and Regulator

Legal Proceedings and Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Legal Proceedings and Regulatory Matters	19. Legal Proceedings and Regulatory Matters The Company is subject to legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, management does not expect that the ultimate costs to resolve these matters will have a material adverse effect on the Company’s consolidated financial position, results of operations, or cash flows.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events	20. Subsequent Events In January 2016, the Company awarded the following: 234,412 shares of restricted stock to certain employees. The fair value of the stock award on the date of grant totaled $4,048, which will be recognized as expense, net of estimated forfeitures, on a straight-line basis over the three-year vesting period. 6,095 units of phantom shares to certain key international employees. The fair value of the stock award on the date of grant totaled $105. Market-based cash awards to certain executives of the Company with a total target award of $1,324. The amount of awards that will ultimately vest can range from 0 to 200% based on the Company’s Relative Total Shareholder Return calculated over a three year period beginning January 1, 2016 through December 31, 2018. As of January 31, 2016, we were in breach of the asset coverage ratio covenant (which requires a ratio of certain assets to total debt of at least 1.25). Our asset coverage ratio as of January 31, 2016 was 1.21. In order to cure this breach, the Company repaid $16,100 of borrowings under the credit facility in February 2016. On February 26, 2016, the Company entered into a sixth amendment to the credit facility that, among other items, removed the minimum tangible net worth covenant effective July 1, 2016 through March 31, 2017, and replaced it with a minimum liquidity covenant calculated monthly beginning as of July 31, 2016 through as of March 31, 2017.

Significant Accounting Polici29

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of CARBO Ceramics Inc. and its operating subsidiaries. All significant intercompany transactions have been eliminated.
Concentration of Credit Risk, Accounts Receivable and Other Receivables	Concentration of Credit Risk, Accounts Receivable and Other Receivables The Company performs periodic credit evaluations of its customers’ financial condition and generally does not require collateral. Receivables are generally due within 30 days. The majority of the Company’s receivables are from customers in the petroleum pressure pumping industry. The Company establishes an allowance for doubtful accounts based on its assessment of collectability risk and periodically evaluates the balance in the allowance based on a review of trade accounts receivable. Trade accounts receivable are periodically reviewed for collectability based on customers’ past credit history and current financial condition, and the allowance is adjusted if necessary. Credit losses historically have been insignificant. The allowance for doubtful accounts at December 31, 2015 and 2014 was $2,688 and $1,842, respectively. Other receivables were $300 and $1,084 as of December 31, 2015 and 2014, respectively, of which related mainly to miscellaneous receivables in the United States.
Cash Equivalents	Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The carrying amounts reported in the balance sheet for cash equivalents approximate fair value.
Inventories	Inventories Inventories are stated at the lower of cost (weighted average) or market. Finished goods inventories include costs of materials, plant labor and overhead incurred in the production of the Company’s products and costs to transfer finished goods to distribution centers. The Company evaluates the carrying value of its inventories relative to market value generally on a geographic by-country basis. As needed, more specific reviews within a particular country are made on a product group basis. Due to increasing competition in the China proppant market, the Company evaluated the carrying values of its inventories in China and concluded that market prices had fallen below carrying costs. Consequently, the Company recognized $4,546 and $5,363 lower of cost or market adjustments in cost of sales in 2015 and 2014, respectively, to adjust finished goods and raw materials carrying values to the lower market prices.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost. Repair and maintenance costs are expensed as incurred. Depreciation is computed on the straight-line method for financial reporting purposes using the following estimated useful lives: Buildings and improvements 15 to 30 years Machinery and equipment 3 to 30 years Land-use rights 30 years The Company holds approximately 4,618 acres of land and leasehold interests containing kaolin reserves near its plants in Georgia and Alabama. The Company also holds approximately 313 acres of land and leasehold interests containing sand reserves near its sand processing facility in Marshfield, Wisconsin. The capitalized costs of land and mineral rights as well as costs incurred to develop such property are amortized using the units-of-production method based on estimated total tons of these reserves.
Impairment of Long-Lived Assets and Intangible Assets	Impairment of Long-Lived Assets and Intangible Assets Long-lived assets to be held and used and intangible assets that are subject to amortization are reviewed for impairment whenever events or circumstances indicate their carrying amounts might not be recoverable. Recoverability is assessed by comparing the undiscounted expected future cash flows from the assets with their carrying amount. If the carrying amount exceeds the sum of the undiscounted future cash flows an impairment loss is recorded. The impairment loss is measured by comparing the fair value of the assets with their carrying amounts. Intangible assets that are not subject to amortization are tested for impairment at least annually by comparing their fair value with the carrying amount and recording an impairment loss for any excess of carrying amount over fair value. Fair values are generally determined based on discounted expected future cash flows or appraised values, as appropriate. For additional information on the Company’s long-lived assets and intangible assets impairment assessment, please refer to Note 4 – Impairment of Long-Lived Assets.
Manufacturing Production Levels Below Normal Capacity	Manufacturing Production Levels Below Normal Capacity As a result of the Company substantially reducing manufacturing production levels, including by idling and mothballing certain facilities, the component of the Company’s accounting policy for inventory relating to operating at production levels below normal capacity was triggered and resulted in certain production costs being expensed instead of being capitalized into inventory. The Company expenses fixed production overhead amounts in excess of amounts that would have been allocated to each unit of production at normal production levels. For the year ended December 31, 2015, the Company expensed $33,724 in production costs. There were no such costs in the prior year periods.
Capitalized Software	Capitalized Software The Company capitalizes certain software costs, after technological feasibility has been established, which are amortized utilizing the straight-line method over the economic lives of the related products, generally not to exceed five years.
Goodwill	Goodwill Goodwill represents the excess of the cost of companies acquired over the fair value of their net assets at the date of acquisition. Goodwill relating to each of the Company’s reporting units is tested for impairment annually, during the fourth quarter, as well as when an event, or change in circumstances, indicates an impairment is more likely than not to have occurred. For additional information on the Company’s goodwill impairment assessment, please refer to Note 4 – Impairment of Long-Lived Assets.
Revenue Recognition	Revenue Recognition Revenue from proppant sales is recognized when title passes to the customer, generally upon delivery. Revenue from consulting and geotechnical services is recognized at the time service is performed. Revenue from the sale of fracture simulation software is recognized when title passes to the customer at time of shipment. Revenue from the sale of spill prevention services is recognized at the time service is performed. Revenue from the sale of containment goods is recognized at the time goods are delivered.
Shipping and Handling Costs	Shipping and Handling Costs Shipping and handling costs are classified as cost of sales. Shipping costs consist of transportation costs to deliver products to customers. Handling costs include labor and overhead to maintain finished goods inventory and operate distribution facilities.
Cost of Start-Up Activities	Cost of Start-Up Activities Start-up activities, including organization costs, are expensed as incurred. Start-up costs for 2015 related to the start-up of the first phase of a retrofit of an existing plant to produce KRYPTOSPHERE ®
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Research and Development Costs	Research and Development Costs Research and development costs are charged to operations when incurred and are included in Selling, General and Administrative expenses. The amounts incurred in 2015, 2014 and 2013 were $7,047, $10,855 and $8,416, respectively.
Foreign Subsidiaries	Foreign Subsidiaries Financial statements of the Company’s foreign subsidiaries are translated using current exchange rates for assets and liabilities; average exchange rates for the period for revenues, expenses, gains and losses; and historical exchange rates for equity accounts. Resulting translation adjustments are included in, and the only component of, Accumulated Other Comprehensive Loss as a separate component of shareholders’ equity. For additional information on the Company’s Cumulative Translation Adjustment, please refer to Note 18 – Foreign Currencies.
New Accounting Pronouncements	New Accounting Pronouncements In November 2015, the FASB issued ASU 2015-17, “Income Taxes (Topic 740) – Balance Sheet Classification of Deferred Taxes,” (“ASU 2015-17”) which requires that deferred tax liabilities and assets be classified as noncurrent in the balance sheet. ASU 2015-17 will be effective for the interim and annual periods beginning after December 15, 2016 with early adoption permitted. The Company is currently evaluating the potential impact, if any, of adopting this new guidance on the consolidated financial statements and related disclosures. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606) – Deferral of the Effective Date,” which revises the effective date of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASU 2014-09”) to interim and annual periods beginning after December 15, 2017 with early adoption permitted no earlier than interim and annual periods beginning after December 15, 2016. In May 2014, the FASB issued ASU No. 2014-09, which amends current revenue guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is currently evaluating the potential impact, if any, of adopting this new guidance on the consolidated financial statements and related disclosures. In July 2015, the FASB issued ASU No. 2015-11, “Inventory (Topic 330),” In April 2015, the FASB issued ASU No. 2015-03, “Interest – Imputation of Interest (Subtopic 835-30),” “Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements – Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update)”, In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,”

Significant Accounting Polici30

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Estimated Useful Lives of Property Plant and Equipment	Depreciation is computed on the straight-line method for financial reporting purposes using the following estimated useful lives: Buildings and improvements 15 to 30 years Machinery and equipment 3 to 30 years Land-use rights 30 years

Intangible and Other Assets (Ta

Intangible and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Intangible Assets	Following is a summary of intangible assets as of December 31: 2015 2014 Weighted Gross Accumulated Gross Accumulated Intangibles: Patents and licenses, software and hardware designs 6 years $ 4,754 $ 2,839 $ 4,222 $ 2,171 Developed technology 10 years 2,782 1,739 2,782 1,461 Customer relationships and non-compete 9 years 2,838 2,042 2,838 1,753 Trademark Indefinite — — 833 — $ 10,374 $ 6,620 $ 10,675 $ 5,385
Other Assets	Following is a summary of other assets as of December 31: 2015 2014 Other assets: Bauxite raw materials: Inventories $ 4,145 $ 9,404 Other assets 1,962 1,041 $ 6,107 $ 10,445

Impairment of Long-Lived Asse32

Impairment of Long-Lived Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Components Of Loss (Gain) On Disposal or Impairment Of Assets	Components of loss (gain) on disposal or impairment of assets are as follows: For the years ended December 31, 2015 2014 2013 Domestic long-lived assets impairment $ 42,664 $ 4,956 $ — China assets impairment 1,033 10,164 — Goodwill and intangible assets impairment 9,497 — — China CTA gain realization (8,853 ) — — Gain on disposal of assets (230 ) (41 ) (43 ) Total $ 44,111 $ 15,079 $ (43 )

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2015
Net Minimum Future Rental Payments Due Under Non-Cancelable Operating Leases	Net minimum future rental payments due under non-cancelable operating leases with remaining terms in excess of one year as of December 31, 2015 are as follows: 2016 $ 17,197 2017 19,445 2018 17,396 2019 14,519 2020 14,102 Thereafter 49,555 Total $ 132,214

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Significant Components of Deferred Tax Assets and Liabilities	Significant components of the Company’s deferred tax assets and liabilities as of December 31 are as follows: 2015 2014 Deferred tax assets: Employee benefits $ 1,296 $ 1,440 Inventories 7,071 6,966 Natural gas derivatives 4,183 — Goodwill 3,980 874 Net Operating Loss 39,360 — Other 1,723 2,942 Foreign losses 1,230 4,300 Foreign tax assets valuation allowance (1,230 ) (4,300 ) Total deferred tax assets 57,613 12,222 Deferred tax liabilities: Depreciation 71,976 81,628 Total deferred tax liabilities 71,976 81,628 Net deferred tax liabilities $ 14,363 $ 69,406
Significant Components of Provision for Income Taxes	Significant components of the provision for income taxes for the years ended December 31 are as follows: 2015 2014 2013 Current: Federal $ 1,509 $ 11,310 $ 27,188 State 120 500 2,164 Foreign 966 1,084 842 Total current 2,595 12,894 30,194 Deferred (56,800 ) 24,389 10,121 $(54,205) $ 37,283 $ 40,315
Reconciliation of Income Taxes Computed at U.S. Statutory Tax Rate to Income Tax Expense	The reconciliation of income taxes computed at the U.S. statutory tax rate to the Company’s income tax expense for the years ended December 31 is as follows: 2015 2014 2013 Amount Percent Amount Percent Amount Percent U.S. statutory rate $ (57,312 ) (35.0 )% $ 32,505 35.0 % $ 43,820 35.0 % State income taxes, net of federal tax benefit (3,474 ) (2.1 ) 1,882 2.0 2,097 1.7 Mining depletion (1,557 ) (0.9 ) (3,035 ) (3.3 ) (2,751 ) (2.2 ) Change in election to deduct foreign taxes paid 1,442 0.9 — — — — Foreign tax assets valuation allowance 1,230 0.7 4,300 4.6 — — Non-recognized benefit on foreign investments 847 0.5 2,980 3.2 — — Section 199 Manufacturing Benefit and other 4,619 2.8 (1,349 ) (1.4 ) (2,851 ) (2.3 ) $ (54,205 ) (33.1 )% $ 37,283 40.1 % $ 40,315 32.2 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Measurements of Financial Assets and Liabilities on Recurring and Non Recurring Basis	The following table sets forth by level within the fair value hierarchy the Company’s assets and liabilities that were accounted for at fair value: Fair value as of December 31, 2015 Level 1 Level 2 Level 3 Total Assets: Impaired long-lived assets $ — $ — $ 5,896 $ 5,896 Liabilities: Derivative instruments — (11,155 ) — (11,155 ) Total fair value $ — $ (11,155 ) $ 5,896 $ (5,259 ) Fair value as of December 31, 2014 Level 1 Level 2 Level 3 Total Assets: Impaired long-lived assets $ — $ — $ 2,138 $ 2,138 Liabilities: Derivative instruments — — — — Total fair value $ — $ — $ 2,138 $ 2,138

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Restricted Stock Activity and Related Information	A summary of restricted stock activity and related information for the year ended December 31, 2015 is presented below: Shares Weighted- Grant-Date Nonvested at January 1, 2015 147,489 $ 99.51 Granted 225,487 $ 34.62 Vested (70,089 ) $ 98.59 Forfeited (36,735 ) $ 51.62 Nonvested at December 31, 2015 266,152 $ 51.39

(Loss) Earnings Per Share (Tabl

(Loss) Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Computation of Basic and Diluted (Loss) Earnings per Share under Two-Class Method	The following table sets forth the computation of basic and diluted (loss) earnings per share under the two-class method: 2015 2014 2013 Numerator for basic and diluted (loss) earnings per share: Net (loss) income $ (109,544 ) $ 55,588 $ 84,886 Effect of reallocating undistributed earnings of participating securities — (376 ) (530 ) Net (loss) income available under the two-class method $ (109,544 ) $ 55,212 $ 84,356 Denominator: Denominator for basic (loss) earnings per share—weighted-average shares 22,999,318 22,946,395 22,957,013 Effect of dilutive potential common shares — — — Denominator for diluted (loss) earnings per share—adjusted weighted-average shares 22,999,318 22,946,395 22,957,013 Basic (loss) earnings per share $ (4.76 ) $ 2.41 $ 3.67 Diluted (loss) earnings per share $ (4.76 ) $ 2.41 $ 3.67

Quarterly Operating Results--38

Quarterly Operating Results--(Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Operating Results	Quarterly results for the years ended December 31, 2015 and 2014 were as follows: Three Months Ended March 31 June 30 September 30 December 31 2015 Revenues $ 73,747 $ 73,752 $ 75,807 $ 56,768 Gross loss (25,998 ) (10,302 ) (4,597 ) (15,228 ) Net loss (28,602 ) (17,004 ) (13,898 ) (50,040 ) Loss per share: Basic $ (1.24 ) $ (0.74 ) $ (0.60 ) $ (2.17 ) Diluted $ (1.24 ) $ (0.74 ) $ (0.60 ) $ (2.17 ) 2014 Revenues $ 148,564 $ 176,561 $ 155,402 $ 167,798 Gross profit 44,364 53,648 42,150 41,118 Net income 18,427 23,017 13,744 399 Earnings per share: Basic $ 0.80 $ 1.00 $ 0.60 $ 0.02 Diluted $ 0.80 $ 1.00 $ 0.60 $ 0.02

Sales to Customers (Tables)

Sales to Customers (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Total Revenue from Major Customers	The following schedule presents customers from whom the Company derived 10% or more of total revenues for the years ended December 31: Major Customers A B 2015 10.7 % 26.9 % 2014 22.4 % 29.9 % 2013 13.1 % 34.7 %

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2015
Long Lived Assets
Geographic Information for Long-Lived Assets and Revenues in United States and other Countries	Long-lived assets, consisting of net property, plant and equipment and other long-term assets, as of December 31 in the United States and other countries are as follows: 2015 2014 2013 Long-lived assets: United States $ 531,518 $ 561,109 $ 454,031 International 12,320 18,052 35,372 Total $ 543,838 $ 579,161 $ 489,403
Revenues From External Customers
Geographic Information for Long-Lived Assets and Revenues in United States and other Countries	Revenues for the years ended December 31 in the United States, Canada and other countries are as follows: 2015 2014 2013 Revenues: United States $ 199,187 $ 491,004 $ 529,603 Canada 33,614 73,092 43,329 Other international 46,773 84,229 94,466 Total $ 279,574 $ 648,325 $ 667,398

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Benefit Costs Recognized as Expense under Plans	Benefit costs recognized as expense under these plans consisted of the following for the years ended December 31: 2015 2014 2013 Contributions: Profit sharing $ — $ 2,337 $ 2,126 Savings 1,547 1,849 1,609 $ 1,547 $ 4,186 $ 3,735

Significant Accounting Polici42

Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)aProject	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Significant Accounting Policies [Line Items]
Number of projects suspended | Project	2
Percentage of suspended assets relating to two projects	85.00%
Projects completed percentage	90.00%
Allowance for doubtful accounts	$ 2,688	$ 1,842
Other receivables	300	1,084
Lower of Cost or Market Inventory Adjustments	4,546	5,363
Production cost	33,724
Start-up costs	797	811	$ 0
Research and development expenses	7,047	$ 10,855	$ 8,416
Georgia
Significant Accounting Policies [Line Items]
Severance costs	$ 9,497
Georgia | Millen
Significant Accounting Policies [Line Items]
Production idling period	90 days
Georgia | Toomsboro
Significant Accounting Policies [Line Items]
Production idling period	90 days
Georgia and Alabama
Significant Accounting Policies [Line Items]
Area of land and leasehold interests | a	4,618
Marshfield, Wisconsin
Significant Accounting Policies [Line Items]
Area of land and leasehold interests | a	313
Maximum
Significant Accounting Policies [Line Items]
Receivables collection period	30 days
Maturity period for all highly liquid investments when purchased to be cash equivalents	3 months
Capitalized software estimated useful life	5 years

Estimated Useful Lives of Prope

Estimated Useful Lives of Property Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2015
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	15 years
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	30 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	30 years
Land Use Rights | Average
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	30 years

Summary of Intangible Assets (D

Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Intangible Asset by Major Class [Line Items]
Intangible Assets, Gross (Excluding Goodwill), Total	$ 10,374	$ 10,675
Finite Lived Intangible Assets, Accumulated Amortization	$ 6,620	5,385
Trademark
Schedule of Intangible Asset by Major Class [Line Items]
Weighted average life	Indefinite
Indefinite-lived intangible assets		833
Patents and licenses, software and hardware designs
Schedule of Intangible Asset by Major Class [Line Items]
Weighted average life	6 years
Finite-lived intangible assets, gross	$ 4,754	4,222
Finite Lived Intangible Assets, Accumulated Amortization	$ 2,839	2,171
Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Weighted average life	10 years
Finite-lived intangible assets, gross	$ 2,782	2,782
Finite Lived Intangible Assets, Accumulated Amortization	$ 1,739	1,461
Customer relationships and non-compete
Schedule of Intangible Asset by Major Class [Line Items]
Weighted average life	9 years
Finite-lived intangible assets, gross	$ 2,838	2,838
Finite Lived Intangible Assets, Accumulated Amortization	$ 2,042	$ 1,753

Intangible and Other Assets - A

Intangible and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Intangible Assets Disclosure [Line Items]
Amortization expense for intangible assets	$ 1,235	$ 1,313	$ 1,173
Estimated amortization expense for intangible assets for year one	915
Estimated amortization expense for intangible assets for year two	638
Estimated amortization expense for intangible assets for year three	565
Estimated amortization expense for intangible assets for year four	279
Estimated amortization expense for intangible assets for year five	17
Trademark
Schedule of Intangible Assets Disclosure [Line Items]
Impairment of trademark	$ 833

Other Assets (Detail)

Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Line Items]
Other Assets	$ 1,962	$ 1,041
Other Assets, Total	6,107	10,445
Bauxite raw materials
Other Assets [Line Items]
Inventories	$ 4,145	$ 9,404

Bank Borrowings - Additional In

Bank Borrowings - Additional Information (Detail) - USD ($)	Feb. 26, 2016	Feb. 25, 2016	Jan. 31, 2016	Jul. 27, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Asset coverage ratio					125.00%
Frequency of payments for commitment fees					Quarterly
Commitment fees					$ 75,000	$ 207,000	$ 154,000
Interest cost					2,973,000	135,000	10,000
Line of credit facility, current					33,000,000	25,000,000
Line of credit facility, long term					55,000,000
Repayments on bank borrowings					7,000,000
Property, Plant and Equipment
Line of Credit Facility [Line Items]
Interest cost capitalized					$ 2,038,000	0	$ 0
Minimum
Line of Credit Facility [Line Items]
Commitment fees on unused line of credit, percentage					0.375%
Maximum
Line of Credit Facility [Line Items]
Commitment fees on unused line of credit, percentage					0.50%
Subsequent Event
Line of Credit Facility [Line Items]
Asset coverage ratio			121.00%
Line of credit facility, amount outstanding		$ 71,900,000
Repayments on bank borrowings	$ 16,100,000	$ 16,100,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit amendment date					Jul. 27, 2015
Line of credit, maximum borrowing capacity					$ 100,000,000
Line of credit facility, amount outstanding					88,000,000	$ 25,000,000
Line of credit facility, current					33,000,000
Line of credit facility, long term					$ 55,000,000
Line of credit, weighted average interest rate					4.664%	2.625%
Standby Letters of Credit
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity					$ 8,875,000
Fourth Amendment | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				$ 90,000,000
Revolving credit facility, maturity date				Dec. 31, 2018
Asset coverage ratio				125.00%
Capital expenditures				$ 65,000,000
Proforma liquidity				$ 15,000,000
Fourth Amendment | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Revolving Credit Facility, percentage points added to the reference rate				4.00%
Fourth Amendment | Standby Letters of Credit
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				$ 9,500,000

Impairment of Long-Lived Asse48

Impairment of Long-Lived Assets - Additional information (Detail)	3 Months Ended		12 Months Ended
	Dec. 31, 2015USD ($)$ / bbl	Dec. 31, 2014USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Impairment Of Long Lived Assets [Line Items]
Loss (gain) on disposal or impairment of assets			$ (44,111,000)	$ (15,079,000)	$ 43,000
Impairment of long-lived assets	$ 36,177,000		5,896,000	2,138,000
Deterioration of oil price | $ / bbl	30
Industry fully recovery period	5 years
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation			(8,853,000)
Gain on disposal of assets			230,000	41,000	43,000
Long Lived Asset Impairments
Impairment Of Long Lived Assets [Line Items]
Loss (gain) on disposal or impairment of assets			(43,697,000)	(15,120,000)
Bauxite raw materials
Impairment Of Long Lived Assets [Line Items]
Impairment of long-term portion of the bauxite raw material	$ 6,488,000		6,488,000
Falcon
Impairment Of Long Lived Assets [Line Items]
Impairment of goodwill			8,664,000
Impairment of trademark			$ 833,000
StrataGen
Impairment Of Long Lived Assets [Line Items]
Impairment of goodwill				0	0
Marshfield, Wisconsin
Impairment Of Long Lived Assets [Line Items]
Impairment of long-lived assets				4,956,000	$ 0
Georgia
Impairment Of Long Lived Assets [Line Items]
Period Required to Resume Production			2 years
Period Required to Return to Production Levels at Normal Capacity			4 years
Impairment of long-lived assets			$ 0
Georgia | Millen
Impairment Of Long Lived Assets [Line Items]
Production idling period			90 days
Georgia | Toomsboro
Impairment Of Long Lived Assets [Line Items]
Production idling period			90 days
CHINA
Impairment Of Long Lived Assets [Line Items]
Impairment of long-lived assets		$ 10,164,000
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation	8,853,000		$ 8,853,000
China assets impairment	$ 1,033,000		$ 1,033,000	$ 10,164,000

Components Of Loss (Gain) On Di

Components Of Loss (Gain) On Disposal or Impairment Of Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Impairment Of Assets [Line Items]
Impairment of long-lived assets	$ 36,177		$ 5,896	$ 2,138
Goodwill and intangible assets impairment			9,497
China CTA gain realization			8,853
Gain on disposal of assets			(230)	(41)	$ (43)
Total			44,111	15,079	$ (43)
UNITED STATES
Impairment Of Assets [Line Items]
Impairment of long-lived assets			42,664	4,956
CHINA
Impairment Of Assets [Line Items]
Impairment of long-lived assets		$ 10,164
China assets impairment	1,033		1,033	$ 10,164
China CTA gain realization	$ (8,853)		$ (8,853)

Net Minimum Future Rental Payme

Net Minimum Future Rental Payments Due Under Non-Cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Property, plant and equipment, operating lease payments
2,016	$ 17,197
2,017	19,445
2,018	17,396
2,019	14,519
2,020	14,102
Thereafter	49,555
Total	$ 132,214

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leased Assets [Line Items]
Sublease income				$ 5,031	$ 1,816	$ 208
Rent expense for all operating leases				$ 23,757	$ 24,116	$ 22,542
Scenario, Forecast | Railroad Equipment
Operating Leased Assets [Line Items]
Sublease income	$ 71	$ 301	$ 4,872

Significant Components of Defer

Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Employee benefits	$ 1,296	$ 1,440
Inventories	7,071	6,966
Natural gas derivatives	4,183
Goodwill	3,980	874
Net Operating Loss	39,360
Other	1,723	2,942
Foreign losses	1,230	4,300
Foreign tax assets valuation allowance	(1,230)	(4,300)
Total deferred tax assets	57,613	12,222
Deferred tax liabilities:
Depreciation	71,976	81,628
Total deferred tax liabilities	71,976	81,628
Net deferred tax liabilities	$ 14,363	$ 69,406

Significant Components of Provi

Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 1,509	$ 11,310	$ 27,188
State	120	500	2,164
Foreign	966	1,084	842
Total current	2,595	12,894	30,194
Deferred	(56,800)	24,389	10,121
Income taxes	$ (54,205)	$ 37,283	$ 40,315

Reconciliation of Income Taxes

Reconciliation of Income Taxes Computed at U.S. Statutory Tax Rate to Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of income taxes amount
U.S. statutory rate		$ (57,312)	$ 32,505	$ 43,820
State income taxes, net of federal tax benefit		(3,474)	1,882	2,097
Mining depletion		(1,557)	(3,035)	(2,751)
Change in election to deduct foreign taxes paid		1,442
Foreign tax assets valuation allowance	$ 4,300	1,230	4,300
Non-recognized benefit on foreign investments	$ 2,980	847	2,980
Section 199 Manufacturing Benefit and other		4,619	(1,349)	(2,851)
Income taxes		$ (54,205)	$ 37,283	$ 40,315
Reconciliation of income taxes rate
U.S. statutory rate		(35.00%)	35.00%	35.00%
State income taxes, net of federal tax benefit		(2.10%)	2.00%	1.70%
Mining depletion		(0.90%)	(3.30%)	(2.20%)
Change in election to deduct foreign taxes paid		0.90%
Foreign tax assets valuation allowance		0.70%	4.60%
Non-recognized benefit on foreign investments		0.50%	3.20%
Section 199 Manufacturing Benefit and other		2.80%	(1.40%)	(2.30%)
Effective Income Tax Rate, Continuing Operations, Total		(33.10%)	40.10%	32.20%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes Disclosure [Line Items]
Non-recognized benefit on foreign investments	$ 2,980,000	$ 847,000	$ 2,980,000
Foreign tax assets valuation allowance	$ 4,300,000	1,230,000	4,300,000
Net Operating Loss		39,360,000
Current income tax receivable		36,800,000
Claim of bonus tax depreciation		29,221,000	$ 61,781,000	$ 0
Uncertain tax positions		$ 153,000

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Voteshares	Jan. 28, 2015shares	Dec. 31, 2014shares
Stockholders Equity Note [Line Items]
Common stock votes per share | Vote	1
Preferred stock, shares authorized	5,000		5,000
Shares repurchased	0
Maximum
Stockholders Equity Note [Line Items]
Board of Directors authorized the repurchase of common stock		2,000,000

Natural Gas Derivative Instru57

Natural Gas Derivative Instruments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)MMBTU$ / MMBTU	Dec. 31, 2014$ / MMBTU
Derivative [Line Items]
Loss on derivative instruments | $	$ (11,155)
Natural gas derivative contract
Derivative [Line Items]
Estimated cash flows, discount rate	5.50%
Last derivative contract expiration month and year	2018-12
Contracts volume, derivative instruments | MMBTU	6,600,000
Average price | $ / MMBTU	2.66	4.41
Natural gas derivative contract | 2015 through December 31, 2018
Derivative [Line Items]
Contracts volume, derivative instruments | MMBTU	7,920,000
Average price | $ / MMBTU	4.48
Cost of Sales
Derivative [Line Items]
Loss on derivative instruments | $	$ 15,040

Fair Value Measurements of Fina

Fair Value Measurements of Financial Assets and Liabilities on Recurring and Non Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Assets:
Impaired long-lived assets	$ 36,177	$ 5,896	$ 2,138
Liabilities:
Derivative instruments	(11,155)	(11,155)
Total fair value	(5,259)	(5,259)	2,138
Fair Value, Inputs, Level 2
Liabilities:
Derivative instruments	(11,155)	(11,155)
Total fair value	(11,155)	(11,155)
Fair Value, Inputs, Level 3
Assets:
Impaired long-lived assets		5,896	2,138
Liabilities:
Total fair value	$ 5,896	$ 5,896	$ 2,138

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash awards	$ 753
Executive Officer | Beginning January 1, 2015 through December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
Executive Officer | Beginning January 1, 2015 through December 31, 2017 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to any single participant in any calendar year	50,000
Shares available for issuance under the plan	526,563
Omnibus Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-based award paid to a single participant in any calendar year	$ 5,000
Aggregate number of common stock for issuance under the plan	750,000
Period of years for which the 750,000 shares can be granted over	5 years
Omnibus Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Unrecognized compensation expense, net	$ 8,057
Unrecognized compensation expense, net, weighted average period	1 year 9 months 18 days
Weighted average grant date fair value	$ 34.62	$ 111.99	$ 82.18
Total fair value of restricted stock vested	$ 6,910	$ 5,638	$ 4,995
Omnibus Incentive Plan | Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total fair value of units outstanding	$ 97
Omnibus Incentive Plan | Employee Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term Period	10 years
2014 Omnibus Incentive Plan | Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	5,020
Units vested	0
Units forfeited	1,110
2009 Omnibus Incentive Plan | Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	18,180
Units vested	12,569
Units forfeited	3,904

Summary of Restricted Stock Act

Summary of Restricted Stock Activity and Related Information (Detail) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Shares
Beginning Balance | shares	147,489
Granted | shares	225,487
Vested | shares	(70,089)
Forfeited | shares	(36,735)
Ending Balance | shares	266,152
Weighted-Average Grant-Date Fair Value Per Share
Beginning Balance | $ / shares	$ 99.51
Granted | $ / shares	34.62
Vested | $ / shares	98.59
Forfeited | $ / shares	51.62
Ending Balance | $ / shares	$ 51.39

Computation of Basic and Dilute

Computation of Basic and Diluted (Loss) Earnings per Share under Two-Class Method (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (50,040)	$ (13,898)	$ (17,004)	$ (28,602)	$ 399	$ 13,744	$ 23,017	$ 18,427	$ (109,544)	$ 55,588	$ 84,886
Effect of reallocating undistributed earnings of participating securities										(376)	(530)
Net (loss) income available under the two-class method									$ (109,544)	$ 55,212	$ 84,356
Denominator:
Denominator for basic (loss) earnings per share-weighted-average shares									22,999,318	22,946,395	22,957,013
Effect of dilutive potential common shares									0	0	0
Denominator for diluted (loss) earnings per share-adjusted weighted-average shares									22,999,318	22,946,395	22,957,013
Basic (loss) earnings per share	$ (2.17)	$ (0.60)	$ (0.74)	$ (1.24)	$ 0.02	$ 0.60	$ 1	$ 0.80	$ (4.76)	$ 2.41	$ 3.67
Diluted (loss) earnings per share	$ (2.17)	$ (0.60)	$ (0.74)	$ (1.24)	$ 0.02	$ 0.60	$ 1	$ 0.80	$ (4.76)	$ 2.41	$ 3.67

Quarterly Operating Results (De

Quarterly Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information
Revenues	$ 56,768	$ 75,807	$ 73,752	$ 73,747	$ 167,798	$ 155,402	$ 176,561	$ 148,564	$ 279,574	$ 648,325	$ 667,398
Gross loss	(15,228)	(4,597)	(10,302)	(25,998)	41,118	42,150	53,648	44,364	(56,125)	181,280	192,995
Net income	$ (50,040)	$ (13,898)	$ (17,004)	$ (28,602)	$ 399	$ 13,744	$ 23,017	$ 18,427	$ (109,544)	$ 55,588	$ 84,886
Earnings (loss) per share:
Basic	$ (2.17)	$ (0.60)	$ (0.74)	$ (1.24)	$ 0.02	$ 0.60	$ 1	$ 0.80	$ (4.76)	$ 2.41	$ 3.67
Diluted	$ (2.17)	$ (0.60)	$ (0.74)	$ (1.24)	$ 0.02	$ 0.60	$ 1	$ 0.80	$ (4.76)	$ 2.41	$ 3.67

Schedule of Total Revenue from

Schedule of Total Revenue from Major Customers (Detail) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Major Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.70%	22.40%	13.10%
Major Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	26.90%	29.90%	34.70%

Geographic Information for Long

Geographic Information for Long-Lived Assets and Revenues in United States and other Countries (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-lived assets:
Long-lived assets	$ 543,838				$ 579,161				$ 543,838	$ 579,161	$ 489,403
Revenues:
Revenues	56,768	$ 75,807	$ 73,752	$ 73,747	167,798	$ 155,402	$ 176,561	$ 148,564	279,574	648,325	667,398
UNITED STATES
Long-lived assets:
Long-lived assets	531,518				561,109				531,518	561,109	454,031
Revenues:
Revenues									199,187	491,004	529,603
International
Long-lived assets:
Long-lived assets	$ 12,320				$ 18,052				12,320	18,052	35,372
CANADA
Revenues:
Revenues									33,614	73,092	43,329
Other International
Revenues:
Revenues									$ 46,773	$ 84,229	$ 94,466

Geographic Information - Additi

Geographic Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sales Revenue, Net | Customer Concentration Risk | Outside United States
Revenue, Major Customer [Line Items]
Concentration risk percentage	29.00%	24.00%	21.00%

Benefit Costs Recognized as Exp

Benefit Costs Recognized as Expense Under Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Benefit plan contributions
Benefit plan contributions	$ 1,547	$ 4,186	$ 3,735
Profit Sharing Plan
Benefit plan contributions
Benefit plan contributions		2,337	2,126
Savings Plan
Benefit plan contributions
Benefit plan contributions	$ 1,547	$ 1,849	$ 1,609

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Percentage of participant directed contributions to benefit plans	100.00%
Maximum
Defined Contribution Plan Disclosure [Line Items]
Participants contribution percentage allowed to invest in Company's common stock	20.00%

Commitments - Additional Inform

Commitments - Additional Information (Detail) $ in Thousands

Oct. 12, 2015T

Nov. 13, 2014T

Nov. 30, 2012USD ($)

Jan. 30, 2012T

Nov. 01, 2008USD ($)

Oct. 31, 2014

May. 31, 2012

Jul. 31, 2011T

Jan. 31, 2003

Dec. 31, 2015USD ($)

Dec. 31, 2014USD ($)

Dec. 31, 2013USD ($)

Dec. 31, 2011

Nov. 30, 2015

Long-term Purchase Commitment [Line Items]

Annual rental fee

$ 23,757

$ 24,116

$ 22,542

Net book value of property leased

537,731

568,716

Lease Agreements

Long-term Purchase Commitment [Line Items]

Net book value of property leased

316,458

Eufaula | kaolin | Supplier 2

Long-term Purchase Commitment [Line Items]

Commitment effective date

Jan. 1, 2011

Purchase commitment, period

3 years

Additional purchase commitment, period

6 years

Purchase commitment amount

$ 2,380

2,263

3,788

Eufaula | kaolin | Supplier 2 | After Amendment

Long-term Purchase Commitment [Line Items]

Additional purchase commitment, period

3 years

Eufaula | kaolin | Supplier 2 | Minimum

Long-term Purchase Commitment [Line Items]

Purchase obligation percentage of annual requirements

70.00%

Eufaula | kaolin | Supplier 2 | Minimum | After Amendment

Long-term Purchase Commitment [Line Items]

Purchase commitment, period

5 years

Purchase obligation percentage of annual requirements

50.00%

McIntyre | Wilkinson County Development Authority

Long-term Purchase Commitment [Line Items]

Agreement entry date

Nov. 1, 2008

Annual rental fee

$ 50

Lease agreement period

Through November 1, 2017

McIntyre | Lease Agreements

Long-term Purchase Commitment [Line Items]

Lease expiration period

Jan. 1, 2021

McIntyre | kaolin | Supplier 3

Long-term Purchase Commitment [Line Items]

Commitment effective date

Jan. 1, 2003

Purchase commitment amount

$ 3,245

14,823

13,091

Agreement entry date

Jan. 1, 2003

McIntyre | kaolin | Supplier 3 | Minimum

Long-term Purchase Commitment [Line Items]

Purchase obligation percentage of annual requirements

80.00%

McIntyre And Toomsboro [Member] | kaolin | Supplier 3

Long-term Purchase Commitment [Line Items]

Purchase obligation percentage of annual requirements

100.00%

Marshfield, Wisconsin | Hydro sized sand

Long-term Purchase Commitment [Line Items]

Purchase commitment amount

3,997

6,922

$ 3,546

Marshfield, Wisconsin | Hydro sized sand | After Amendment

Long-term Purchase Commitment [Line Items]

Purchase commitment, commencing date

Jan. 30, 2012

Marshfield, Wisconsin | Hydro sized sand | Prior Agreement

Long-term Purchase Commitment [Line Items]

Commitment effective date

Jul. 30, 2011

Purchase commitment, period

5 years

Marshfield, Wisconsin | Frac sand

Long-term Purchase Commitment [Line Items]

Purchase commitment amount

1,751

Marshfield, Wisconsin | During 2011 | Hydro sized sand | Prior Agreement

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

40,000

Marshfield, Wisconsin | During 2012 | Hydro sized sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

150,000

Marshfield, Wisconsin | During 2012 | Hydro sized sand | Prior Agreement

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

100,000

Marshfield, Wisconsin | During 2013 | Hydro sized sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

150,000

Marshfield, Wisconsin | During 2014 | Hydro sized sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

350,000

Marshfield, Wisconsin | During 2015 | Frac sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

123,203

Marshfield, Wisconsin | During 2015 | Frac sand | Prior Agreement

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

300,000

Marshfield, Wisconsin | Each year after 2015 | Frac sand | Prior Agreement

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

400,000

Marshfield, Wisconsin | During 2016 | Frac sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

116,599

Marshfield, Wisconsin | 2017 and thereafter | Frac sand | After Amendment

Long-term Purchase Commitment [Line Items]

Minimum quantity to be purchased annually | T

400,000

Millen Georgia | Jenkins County Development Authority

Long-term Purchase Commitment [Line Items]

Agreement entry date

Nov. 1, 2012

Lease agreement period

Until the tenth anniversary of completion of the final phase of the facility.

Lease administrative fees

$ 50

Millen Georgia | Kaolin And Bauxite | Supplier 7

Long-term Purchase Commitment [Line Items]

Purchase commitment, period

5 years

Additional purchase commitment, period

5 years

Purchase commitment amount

561

1,465

Agreement entry date

May 31, 2012

Millen Georgia | Kaolin And Bauxite | Supplier 7 | Minimum

Long-term Purchase Commitment [Line Items]

Purchase obligation percentage of annual requirements

50.00%

Millen Georgia | Kaolin And Bauxite | Supplier 8

Long-term Purchase Commitment [Line Items]

Purchase commitment, period

5 years

Additional purchase commitment, period

2 years

Purchase commitment amount

$ 1,300

$ 577

Agreement entry date

Oct. 31, 2014

Millen Georgia | Kaolin And Bauxite | Supplier 8 | Minimum

Long-term Purchase Commitment [Line Items]

Purchase obligation percentage of annual requirements

50.00%

Employment Agreements - Additio

Employment Agreements - Additional Information (Detail) - President and Chief Executive Officer	12 Months Ended
	Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Obligation payable	18 months
Employee benefit payments period	2 years
Non competition covenant period	2 years
Employment agreement extension period	1 year

Foreign Currencies - Additional

Foreign Currencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 16,559,000
Cumulative foreign currency translation loss, net of deferred income tax benefit	(37,702,000)	$ (22,969,000)
Amount reclassified to net income	8,853,000
Income tax (benefit) expense	(54,205,000)	$ 37,283,000	$ 40,315,000
Foreign Currency Exchange Gain (Loss), Net
Schedule of Foreign Currency Balance [Line Items]
Income tax (benefit) expense	$ 0

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Feb. 26, 2016	Feb. 25, 2016	Jan. 31, 2016	Jan. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Asset coverage ratio					125.00%
Repayments on bank borrowings					$ 7,000
Executive Officer
Subsequent Event [Line Items]
Vesting period					3 years
Cash awards					$ 753
Subsequent Event
Subsequent Event [Line Items]
Asset coverage ratio			121.00%
Repayments on bank borrowings	$ 16,100	$ 16,100
Subsequent Event | Restricted Stock
Subsequent Event [Line Items]
Shares or units awarded to certain employees				234,412
Fair value of the stock award on the date of grant			$ 4,048	$ 4,048
Vesting period				3 years
Subsequent Event | Phantom Share Units (PSUs)
Subsequent Event [Line Items]
Shares or units awarded to certain employees				6,095
Fair value of the stock award on the date of grant			105	$ 105
Subsequent Event | Market Based Awards | Executive Officer
Subsequent Event [Line Items]
Vesting period				3 years
Cash awards			$ 1,324	$ 1,324
Subsequent Event | Market Based Awards | Executive Officer | Beginning January 1, 2016 through December 31, 2018
Subsequent Event [Line Items]
Vesting percentage				200.00%
Subsequent Event | Market Based Awards | Executive Officer | Beginning January 1, 2016 through December 31, 2018 | Minimum
Subsequent Event [Line Items]
Vesting percentage				0.00%