Carbo Ceramics (CRRTQ) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		28,092,216
Entity Public Float			$ 129,537,208

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 72,752	$ 68,169
Restricted cash	1,725	6,935
Trade accounts and other receivables, net	35,693	37,705
Inventories:
Finished goods	41,422	59,519
Raw materials and supplies	22,592	19,480
Total inventories	64,014	78,999
Prepaid expenses and other current assets	4,754	3,989
Income tax receivable	2,319
Total current assets	181,257	195,797
Restricted cash	8,840	3,281
Income tax receivable		2,389
Property, plant and equipment:
Land and land improvements	39,584	41,590
Land-use and mineral rights	19,696	19,696
Buildings	75,815	72,427
Machinery and equipment	432,906	455,863
Construction in progress	29,129	36,138
Total property, plant and equipment	597,130	625,714
Less accumulated depreciation and amortization	323,511	301,528
Net property, plant and equipment	273,619	324,186
Goodwill	3,500	3,500
Intangible and other assets, net	7,150	11,445
Total assets	474,366	540,598
Current liabilities:
Accounts payable	12,174	19,417
Accrued payroll and benefits	6,950	6,056
Accrued freight	2,434	2,292
Accrued utilities	1,012	1,552
Other accrued expenses	14,020	10,577
Derivative instruments		2,537
Notes payable, related parties	27,040
Long-term debt, current portion	15,733
Other current liabilities	1,192
Total current liabilities	80,555	42,431
Deferred income taxes	1,114	230
Long-term debt, net	45,650	60,698
Notes payable, related parties		27,040
Other long-term liabilities	10,764	4,434
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; 27,710,861 and 27,133,614 shares issued and outstanding at December 31, 2018 and 2017, respectively	277	271
Additional paid-in capital	132,080	125,715
Retained earnings	203,926	279,779
Total shareholders’ equity	336,283	405,765
Total liabilities and shareholders’ equity	$ 474,366	$ 540,598

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
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	27,710,861	27,133,614
Common stock, share outstanding	27,710,861	27,133,614

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 210,745	$ 188,756
Cost of sales (exclusive of depreciation and amortization shown below)	201,165	200,351
Depreciation and amortization	32,269	41,730
Gross loss	(22,689)	(53,325)
Selling, general and administrative expenses (exclusive of depreciation and amortization shown below)	39,227	39,981
Depreciation and amortization	2,336	2,552
Other operating (income) expense	(332)	125,778
Operating loss	(66,575)	(248,383)
Other expense:
Interest expense, net	(8,503)	(7,700)
Other income, net	537	940
Nonoperating income (expense), total	(7,966)	(6,760)
Loss before income taxes	(74,541)	(255,143)
Income tax expense (benefit)	892	(2,027)
Net loss	$ (75,433)	$ (253,116)
Loss per share:
Basic	$ (2.79)	$ (9.49)
Diluted	$ (2.79)	$ (9.49)
Millen, Georgia Facility
Loss on sale of business	$ 2,305	$ 0
Russian Proppant
Loss on sale of business	$ 350	$ 26,747

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (75,433)	$ (253,116)
Other comprehensive income:
Foreign currency translation adjustment	0	979
Reclassification of Russia cumulative translation loss to Net Loss upon sale		33,347
Other comprehensive income	0	34,326
Comprehensive loss	(75,433)	(218,790)
Russia
Other comprehensive income:
Reclassification of Russia cumulative translation loss to Net Loss upon sale	$ 0	$ 33,347

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, 2016	$ 616,570	$ 269	$ 117,192	$ 533,435	$ (34,326)
Net loss	(253,116)			(253,116)
Foreign currency translation adjustment	979				979
Reclassification of Russia cumulative translation loss to Net Loss upon sale	33,347				$ 33,347
Comprehensive loss	(218,790)
Issuance of warrant	3,870		3,870
Stock granted under restricted stock plan, net	400	2	398
Stock based compensation	4,255		4,255
Shares surrendered by employees to pay taxes	(540)			(540)
Balances at Dec. 31, 2017	405,765	271	125,715	279,779
Net loss	(75,433)			(75,433)
Comprehensive loss	(75,433)
Stock sold under ATM program	2,849	3	2,846
Stock granted under restricted stock plan, net	320	4	316
Stock based compensation	3,203		3,203
Shares surrendered by employees to pay taxes	(421)	(1)		(420)
Balances at Dec. 31, 2018	$ 336,283	$ 277	$ 132,080	$ 203,926

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net loss	$ (75,433)	$ (253,116)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	34,605	44,282
Amortization of debt issuance costs and original issue discount	685	1,055
Provision for doubtful accounts	561	589
Deferred income taxes	884	(2,134)
(Gain) on disposal or impairment of assets	(1,089)	125,778
Foreign currency transaction gain, net		(35)
Stock compensation expense	3,565	4,892
PIK accrual on notes payable, related parties		2,040
Change in fair value of derivative instruments	(2,537)	(930)
Changes in operating assets and liabilities:
Trade accounts and other receivables	1,451	(20,533)
Inventories	14,156	10,524
Prepaid expenses and other current assets	717	724
Accounts payable	(8,759)	11,666
Accrued expenses	3,710	8,687
Income tax receivable, net	69	(357)
Other, net	3,162	2,949
Net cash used in operating activities	(21,598)	(38,818)
Investing activities
Capital expenditures	(2,039)	(2,598)
Net proceeds from asset sales	27,526	21,600
Net cash provided by investing activities	25,487	19,002
Financing activities
Proceeds from long-term debt		12,349
Repayments on long-term debt		(3,250)
Repayments on insurance financing agreement	(1,385)	(1,296)
Payment of debt issuance costs		(989)
Purchase of common stock	(421)	(539)
Net cash provided by financing activities	1,043	6,275
Effect of exchange rate changes on cash		246
Net increase (decrease) in cash and cash equivalents and restricted cash	4,932	(13,295)
Cash and cash equivalents and restricted cash at beginning of year	78,385	91,680
Cash and cash equivalents and restricted cash at end of year	83,317	78,385
Supplemental cash flow information
Interest paid	7,700	2,319
Income taxes paid		457
Russian Proppant
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Loss on sale of business	2,305
Millen, Georgia Facility
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Loss on sale of business	350	$ 25,101
ATM Program
Financing activities
Proceeds from issuance of common stock under ATM program	$ 2,849

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	1. Significant Accounting Policies Description of Business CARBO Ceramics Inc. (the “Company”) was formed in 1987 and is a global technology company that provides products and services to the oil and gas, industrial, and environmental markets to enhance value for its clients. The Company has production plants in: New Iberia, Louisiana; Eufaula, Alabama; McIntyre, Georgia; and Toomsboro, Georgia; and a sand processing facility in Marshfield, Wisconsin. The Company sold its Millen, Georgia production plant in December 2018. The Company sells its proppant products through pumping service companies that perform hydraulic fracturing for oil and gas companies. In addition, the Company sells ceramic media to industrial markets. Finished goods inventories are stored at the plant sites and various domestic and international remote distribution facilities. The Company also provides one of the industry’s most widely used hydraulic fracture simulation software FracPro, as well as hydraulic fracture design and consulting services. In addition, the Company provides a broad range of technologies for spill prevention, containment and countermeasures to oil and gas and industrial markets. Beginning in late 2014, 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 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. The Company incurred severance costs of $924 and $287 during 2018 and 2017, respectively, as a result of these actions. As of December 31, 2018, we are producing technology ceramic proppants from our Eufaula, Alabama manufacturing facility, base ceramic proppants from our Toomsboro, Georgia manufacturing facility, and processing sand at our Marshfield, Wisconsin facility. We are also producing ceramic media at our McIntyre, Georgia and Eufaula, Alabama facilities. We are also using our Toomsboro, Georgia facility for contract manufacturing. In addition, we produce resin-coated ceramic proppants at our New Iberia, Louisiana facility. The Company continues to assess liquidity needs and manage cash flows. As a result of the steps the Company has taken to enhance its liquidity, the Company currently believes that cash on hand and cash flows from operations will enable the Company to meet its working capital, capital expenditure, debt service and other funding requirements for at least one year from the date this Form 10-K is issued. The Company’s view regarding sufficiency of cash and liquidity is primarily based on our financial forecast for 2019 and the first quarter of 2020, which is impacted by various assumptions regarding demand and sales prices for our products. Generally, we expect demand for our products and the sales prices to remain consistent in 2019 and the first quarter of 2020 compared to 2018, and this expectation is included within our financial forecast for 2019 and the first quarter of 2020. We also expect to decrease our operating costs in 2019 and the first quarter of 2020 compared to 2018 while improving our cash position through continued balance sheet management. Our financial forecasts in recent periods have proven less reliable given customer demand, which is highly volatile in the current operating environment and no committed sales backlog exists with our customers. As a result, there is no guarantee that our financial forecast, which projects sufficient cash will be available to meet planned operating expenses and other cash needs, will be accurate. In the event that the Company experiences lower customer demand, lower prices for its products and services, or higher expenses than it forecasted or if the Company underperforms relative to its forecast, the Company could experience negative cash flows from operations, as has been the case in prior years, which would reduce its cash balances and liquidity. The second phase of the retrofit of our Eufaula, Alabama 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, as well as industrial and environmental industries. 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, 2018 and 2017 was $1,279 and $1,602, respectively. Other receivables were $442 and $546 as of December 31, 2018 and 2017, 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. Restricted Cash A portion of the Company’s cash balance is restricted to its use in order to provide collateral primarily for letters of credit and funds held in escrow relating to the sale of its Millen plant. As of December 31, 2018 and 2017, total restricted cash was $10,565 and 10,216, respectively. Inventories Inventories are stated at the lower of net realizable value or cost. 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 evaluated the carrying values of its inventories and concluded that no adjustments were required in 2018 or 2017. 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 2,957 acres of land and leasehold interests containing kaolin reserves near its plants in Georgia and Alabama. The Company also holds approximately 469 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 5 – Other Operating (Income) Expense. 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 years ended December 31, 2018 and 2017, the Company expensed $32,509 and $40,664, respectively, in production costs. 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 5 – Other Operating (Income) Expense. Revenue Recognition Revenue from proppant sales is recognized when title passes to the customer, generally upon delivery. Revenue from consulting and contract manufacturing 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. There were no start-up costs for 2018 and 2017. 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 2018 and 2017 were $3,823 and $4,417, respectively. New Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which amends current lease guidance. This guidance requires, among other things, that lessees recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessees and lessors must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. In July 2018, the FASB issued ASU No. 2018-11, “Leases (Topic 842): Targeted Improvements”, which simplifies the implementation by allowing entities the option to instead apply the provisions of the new guidance at the effective date, without adjusting the comparative periods presented. The new lease guidance will be effective for the interim and annual periods beginning after December 15, 2018 with early adoption permitted. The Company adopted this guidance effective January 1, 2019 without adjusting the comparative periods. During the first quarter of 2019, the Company expects its ROU asset will be within a range of $54,000 to $60,000 and its total lease liability will be within a range of $62,000 to $68,000. In addition, upon implementation, the Company’s deferred rent balances, recorded primarily within other long-term liabilities and accrued expenses as of December 31, 2018, of approximately $8,300 will be offset with the lease liability. The Company has implemented a lease accounting system for accounting for leases under the new standard. There were no significant impacts to the consolidated statement of operations and consolidated statement of cash flows. In August 2015, the FASB issued ASU No. 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 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’s analysis of sales contracts under ASC 606 supports the recognition of revenue at a point in time, typically when title passes to the customer upon delivery, for the majority of contracts, which is consistent with the current revenue recognition model. The Company utilized the modified retrospective approach, which requires a cumulative adjustment to retained earnings and no adjustments to prior periods. The Company adopted this guidance as of January 1, 2018. There was no material impact on the Company’s consolidated financial statements or disclosures.

Disaggregated Revenue

Disaggregated Revenue	12 Months Ended
	Dec. 31, 2018
Disaggregation Of Revenue [Abstract]
Disaggregated Revenue	2. Disaggregated Revenue The following table disaggregates revenue by product line for the years ended December 31: 2018 2017 Technology products and services $ 50,917 $ 43,383 Industrial products and services 14,873 12,030 Base ceramic and sand proppants 112,819 110,144 Oilfield and Industrial Technologies and Services segment 178,609 165,557 Environmental Technologies and Services segment 32,136 23,199 $ 210,745 $ 188,756 Sales of oilfield technology products and services, consulting services, and FracPro software sales are included within Technology products and services. Sales of industrial ceramic products, industrial technology products and contract manufacturing are included within Industrial products and services. Sales of oilfield base ceramic and sand proppants, as well as railcar usage fees are included within Base ceramic and sand proppants.

Intangible and Other Assets

Intangible and Other Assets	12 Months Ended
	Dec. 31, 2018
Intangible And Other Assets [Abstract]
Intangible and Other Assets	3. Intangible and Other Assets Following is a summary of intangible assets as of December 31: 2018 2017 Weighted Average Life Gross Amount Accumulated Amortization Gross Amount Accumulated Amortization Intangibles: Patents and licenses, software and hardware designs 6 years $ 5,177 $ 3,430 $ 5,320 $ 3,540 Developed technology 10 years 2,782 2,573 2,782 2,295 Customer relationships and non-compete 9 years 2,838 2,838 2,838 2,621 $ 10,797 $ 8,841 $ 10,940 $ 8,456 Amortization expense for 2018 and 2017 was $889 and $921, respectively. Estimated amortization expense for each of the ensuing years through December 31, 2023 is $602, $341, $324, $40 and $0, respectively. Following is a summary of other assets as of December 31: 2018 2017 Other assets: Inventories - bauxite raw materials $ 4,160 $ 3,527 Other 1,034 5,434 $ 5,194 $ 8,961 Bauxite raw materials are used in the production of heavyweight ceramic products. As of December 31, 2018 and 2017, 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 5 – Other Operating (Income) Expense. Other assets as of December 31, 2017 includes a $4,000 receivable relating to additional money owed us relating to the sale of our Russian proppant business. This receivable was settled for $3,650 during 2018 and we recognized an additional loss on the sale of $350. For additional information, refer to Note 18 – Sale of Russian Proppant Business.

Long-Term Debt and Notes Payabl

Long-Term Debt and Notes Payable	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt and Notes Payable	4. Long-Term Debt and Notes Payable On March 2, 2017, the Company entered into an Amended and Restated Credit Agreement (the “New Credit Agreement”) with Wilks Brothers, LLC (“Wilks”) to replace its term loan with Wells Fargo Bank, National Association (“Wells Fargo”) and provide the Company with additional liquidity for a longer term. The New Credit Agreement is a $65,000 facility maturing on December 31, 2022, that consists of a $52,651 term loan that was made at closing to pay off Wells Fargo and an additional term loan of $12,349 that was made to the Company after the Company satisfied certain post-closing conditions. The $52,651 term loan was a non-cash transaction to the Company as Wilks directly paid Wells Fargo and assumed the New Credit Agreement. The Company’s obligations bear interest at 9.00% and are guaranteed by its two operating subsidiaries. No principal repayments are required until maturity (except in certain circumstances), and there are no financial covenants. The loan cannot be prepaid during the first three years without making the lenders whole for interest that would have been payable over the entire remaining term of the loan. The Company’s obligations under the New Credit Agreement are secured by: (i) a pledge of all accounts receivable and inventory, (ii) cash in certain accounts, (iii) domestic distribution assets residing on owned real property, (iv) the Company’s Marshfield, Wisconsin and Toomsboro, Georgia plant facilities and equipment, and (v) certain real property interests in mines and minerals. Other liens previously in favor of Wells Fargo were released. As of December 31, 2018, the Company’s outstanding debt under its New Credit Agreement was $65,000. Within 270 days of completion of all post-closing matters relating to the sale of our Millen, Georgia plant, the Company is required to use 100% of the Net Cash Proceeds (as defined in the New Credit Agreement) from the sale to either (1) prepay the outstanding principal amount of the Term Loans or (2) reinvest in fixed or capital assets of any Credit Party. The Company is currently evaluating these options, and the Company may engage in negotiations with its lenders with respect to other options. As of December 31, 2018, the Company has classified $15,733 of the outstanding debt as current liabilities, which represents an estimate of the Net Cash Proceeds that the Company would be required to prepay if it did not reinvest in fixed or capital assets. See Note 19 for details on the sale of our Millen, Georgia plant. As of December 31, 2018, the Company had $683 of unamortized debt issuance costs relating to the New Credit Agreement that are presented as a direct reduction from the carrying amount of the long-term debt obligation. The Company had $2,625 and $9,230 in standby letters of credit issued through its banks as of December 31, 2018 and 2017, respectively, primarily as collateral relating to railcar leases for December 31, 2018 and our natural gas commitments and railcar leases for December 31, 2017. On March 2, 2017, in connection with entry into the New Credit Agreement, the Company issued a Warrant (the “Warrant”) to Wilks. Subject to the terms of the Warrant, the Warrant entitles the holder thereof to purchase up to 523,022 shares of the Common Stock, at an exercise price of $14.91 per share, payable in cash. The Warrant expires on December 31, 2022. Based on a Form 4 filing with the SEC on December 29, 2017, as of December 31, 2018, Wilks owned approximately 11.2% of the Company’s outstanding common stock, and should Wilks fully exercise the Warrant to purchase an additional 523,022 shares, it would hold approximately 12.8% of the Company’s outstanding common stock. Upon issuance of the Warrant, the Company recorded an increase to additional paid-in capital of $3,871. As of December 31, 2018, the unamortized original issue discount was $2,934. In May 2016, the Company received proceeds of $25,000 from the issuance of separate unsecured Promissory Notes (the “Notes”) to two of the Company’s Directors. Each Note matures on April 1, 2019 and bears interest at 7.00%. On March 2, 2017, in connection with the New Credit Agreement, the Notes were amended to provide for payment-in-kind, or PIK, interest payments at 8.00% until the lenders under the New Credit Agreement receive two consecutive semi-annual cash interest payments. On April 1, 2017, the Company made a $997 interest payment as PIK, and capitalized the resulting amount to the outstanding principal balance. On October 1, 2017, the Company made a $1,043 interest payment as PIK, and capitalized the resulting amount to the outstanding principal balance. As of December 31, 2018, the outstanding principal balance of the Notes of $27,040 was recorded within current liabilities based on the April 1, 2019 maturity date. Interest cost for the years ended December 31, 2018 and 2017 was $8,612 and $8,058, respectively. Interest cost primarily includes interest expense relating to the Company’s debts as well as amortization and the write-off of debt issuance costs and amortization of the original issue discount associated with the New Credit Agreement and Warrant.

Other Operating (Income) Expens

Other Operating (Income) Expense	12 Months Ended
	Dec. 31, 2018
Other Income And Expenses [Abstract]
Other Operating (Income) Expense	5. Other Operating (Income) Expense Other operating income for the year ended December 31, 2018 primarily consisted of gains on asset sales, including one of the Company’s distribution centers, and was partially offset by other operating expenses. Other operating expense for the year ended December 31, 2017 was primarily related to an impairment related to the Company’s Millen, Georgia plant. As of September 30, 2017, the Company had concluded that the Company’s Toomsboro and Millen, Georgia facilities should no longer be evaluated together as a group of assets because the facilities are no longer interchangeable and will not manufacture like products. Given the change in the asset groupings of the two facilities and lack of estimated future cash flows associated with the base ceramic production at the Millen facility, the Company identified indicators of impairment at the Millen, Georgia facility as of September 30, 2017. The Company determined that the projected cash flows attributable to the Millen, Georgia facility did not exceed the carrying value of the assets; therefore the Company concluded there was an impairment at that facility. The Company engaged the services of a third party consulting firm to assist with the determination of the fair value of the related assets, which concluded that the assets were impaired. The key assumptions and inputs impacting the fair value include third party data and commentary with respect to the property and equipment at our Millen facility. For machinery and equipment and construction in progress, we used a cost approach to estimate the valuation. We applied a 65 percent downward adjustment to calculated replacement cost based on an analysis of construction documents and historical expenditures to remove non-saleable soft costs such as engineering and installation that would have no value to a market participant. Based on discussions with market participants, a salvage value multiplier ranging from 12 percent to 50 percent of the remaining replacement cost basis was applied to arrive at the estimated fair value for the machinery and equipment and construction in progress subject to impairment. For real property, we used a market and cost approach and reconciled the two approaches. In using the market approach, we determined that the value of comparable property ranged from approximately $30 to $40 per square foot, and the concluded value of the property at the Millen facility was approximately $35 per square foot. In using the cost approach, we applied a 94% downward adjustment to the calculated value for the buildings and site improvements as a representation of economic obsolescence. As a result of these valuation procedures, which included the use of Level 3 inputs as defined in Note 10, the Company recognized a $125,759 impairment of long-lived assets, primarily relating to buildings, machinery and equipment, and construction in progress. As of September 30, 2017, the fair value of the Millen facility was estimated to be $18,756 using Level 3 inputs as defined in Note 10. The Millen facility was sold in December 2018 for $23,000. At the time of the sale, the Millen facility was classified as held for sale with a recorded value of $17,842. See Note 19 for additional information. As a result of the sale of the Company’s Millen facility for less than the carrying value of each of its Toomsboro Georgia and Eufaula, Alabama facilities combined with the continued lowered demand for our base ceramic proppants, the Company evaluated those long-lived assets for possible impairment as of December 31, 2018. We prepared an undiscounted cash flow analysis for these two asset groups. The Eufaula, Alabama facility is part of our technology asset group which also includes our New Iberia, Louisiana facility, and as such, we evaluated the entire technology asset grouping for impairment. Key assumptions underlying our undiscounted cash flow analysis included, but were not limited to, facility utilization, production costs, major maintenance and long-term sales prices for products produced. Based on these analyses, we noted that, for each of these asset groups, the carrying value was below the sum of the undiscounted cash flows, and thus no If there are changes to our material assumptions, it is possible that we may have to recognize impairments in the future. However, we believe that the material assumptions used in our impairment analysis were reasonable and were based on available information and forecasts at the time. We continue to monitor whether or not events or circumstances would indicate that the carrying value of any of our long-lived assets might not be recoverable. The Company assesses goodwill for possible impairment annually or sooner if circumstances indicate possible impairment may have occurred. There were no such impairments during 2018 or 2017.

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	6. 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, 2018 are as follows: 2019 $ 15,331 2020 16,893 2021 16,484 2022 12,562 2023 9,216 Thereafter 16,458 Total $ 86,944 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. However, we expect to reduce our fleet of railcars as our current railcar leases expire. Rent expense for all operating leases was $16,936 in 2018 and $20,310 in 2017. For the years ended December 31, 2018 and 2017, rent expense was stated net of sublease income of $4,142 and $3,040, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	7. 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: 2018 2017 Deferred tax assets: Employee benefits $ 829 $ 836 Inventories 3,902 2,309 Natural gas derivatives — 610 Goodwill & other intangibles 2,350 3,179 Net operating loss 88,341 59,536 Foreign tax credits 667 667 Interest 2,200 552 Accrued expenses 3,496 — Other 352 1,477 Total deferred tax assets 102,137 69,166 Deferred tax liabilities: Depreciation 30,054 14,332 Indefinite-lived intangibles 817 209 Foreign — 26 Total deferred tax liabilities 30,871 14,567 Valuation Allowance 72,380 54,829 Net deferred tax liabilities $ (1,114 ) $ (230 ) Significant components of the provision for income taxes for the years ended December 31 are as follows: 2018 2017 Current: Federal $ — $ (375 ) State (34 ) (99 ) Foreign 42 581 Total current 8 107 Deferred 884 (2,134 ) $ 892 $ (2,027 ) 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: 2018 2017 Amount Percent Amount Percent U.S. statutory rate $ (15,658 ) (21.0 )% $ (89,300 ) (35.0 )% State income taxes, net of federal tax benefit (2,152 ) (2.9 ) (5,684 ) (2.2 ) Mining depletion (163 ) (0.2 ) (619 ) (0.2 ) Change in election for foreign tax credits 32 — (667 ) (0.3 ) Foreign investments 271 0.4 8,569 3.4 Stock compensation excess tax deficiency 348 0.5 876 0.3 Other permanent differences 663 0.9 1,806 0.7 Tax reform deferred rate change — — 28,163 11.0 Valuation allowance 17,551 23.5 54,829 21.5 $ 892 1.2 % $ (2,027 ) (0.8 )% As a result of the significant decline in oil and gas activities and net losses incurred over the past few years, the Company determined during the year ended December 31, 2017 that it was more likely than not that a portion of its deferred tax assets will not be realized in the future. Accordingly, the Company established a $72,380 valuation allowance against its deferred tax assets as of December 31, 2018. The Company’s assessment of the realizability of its deferred tax assets is based on the weight of all available evidence, both positive and negative, including future reversals of deferred tax liabilities. In December 2017, the Tax Cuts and Jobs Act (“Tax Legislation”) was enacted. The Tax Legislation significantly revises the U.S. corporate income tax by, among other things, lowering corporate income tax rates, implementing the territorial tax system and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries. In accordance with the Tax Legislation, the Company recorded $28,163 as additional income tax expense in the fourth quarter of 2017 related to the re-measurement of deferred tax assets and liabilities. Additionally, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, the Company has completed the analysis based on legislative updates relating to the Tax Legislation. No material changes to the provisional amounts recorded as of December 31, 2017 were identified. While the Tax Legislation provides for a territorial tax system, beginning in 2018, it includes the global intangible low-taxed income (“GILTI”) provision. The GILTI provisions require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. FASB guidance indicates that accounting for GILTI either as part of deferred taxes or as a period cost are both acceptable methods. As of December 31, 2018, the Company has not recognized foreign earnings subject to GILTI. An accounting policy will be elected in the first period in which the GILTI provision becomes applicable to the Company. During the years ended December 31, 2018 and 2017, the Company did not recognize benefits on foreign investments due to the uncertainty of the Company being able to realize the foreign tax assets in light of current market conditions in China and Russia. This treatment decreased income tax benefit by $271 and $8,569 for the years ended December 31, 2018 and 2017, respectively. During 2015 through 2018, the Company incurred net operating losses in the United States. Net operating losses associated with the 2015 tax return have been carried back in full, while certain of the net operating losses incurred in 2016, 2017, and 2018 are carried forward to offset future taxable income. The cumulative recorded tax benefit of these net operating loss carryforwards totals $88,341 and $59,536 as of December 31, 2018 and 2017, respectively, and is included in the deferred income tax asset on those respective dates. Theses recorded tax benefits include the impact of the change in corporate income tax rate following the enactment of the Tax Legislation. After finalization of the 2015 Federal return and a change in the attribute of the NOL carryback, additional refunds for 2012 through 2014 tax years are being claimed in the amount of $2,107. These amounts are included within income tax receivable as of December 31, 2018 and 2017. The federal NOLs generated in 2017 and 2016 will be carried forward until they are utilized or their expiration in 2037 and 2036, respectively. The federal NOLs generated in 2018 will be carried forward until they are utilized as they do not expire per the Tax Cuts and Jobs Act. The Company has not recognized any uncertain tax positions as of December 31, 2018. 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. In 2016, the Company received an audit notice from the Internal Revenue Service for periods 2013-2015. The Company does not anticipate any material findings. The 2016 federal tax year is also subject to examination. Various U.S. state jurisdiction tax years remain open to examination as well, although the Company believes assessments, if any, would be immaterial to its consolidated financial statements.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Stockholders Equity Note [Abstract]
Shareholders' Equity	8. 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. The Company does not expect to pay dividends in the foreseeable future. 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. 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. Equity Offering Program On July 28, 2016, the Company filed a prospectus supplement and associated sales agreement related to an at-the-market (“ATM”) equity offering program pursuant to which the Company may sell, from time to time, common stock with an aggregate offering price of up to $75,000 through Cowen and Company LLC, as sales agent, for general corporate purposes. During the year ended December 31, 2018, the Company sold a total of 300,227 shares of its common stock under the ATM program for $2,914, or an average of $9.71 per share, and received proceeds of $2,849, net of commissions of $65.

Natural Gas Derivative Instrume

Natural Gas Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Natural Gas Derivative Instruments	9. Natural Gas Derivative Instruments Natural gas is used to fire the kilns at the Company’s manufacturing plants. In an effort to mitigate volatility in the cost of natural gas purchases and reduce exposure to short term spikes in the price of this commodity, we contracted in advance for portions of our future natural gas requirements. Due to the severe decline in industry activity beginning in early 2015, we significantly reduced production levels and consequently did not take delivery of all of the contracted natural gas quantities. As a result, we had accounted for the relevant contracts as derivative instruments. However, as of December 31, 2018, our last derivative contract expired and no future natural gas obligations existed. The Company used 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 were discounted using a discount rate of 8.0%, 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, 2017. During the year ended December 31, 2018 and 2017, the Company recognized a gain on derivative instruments of $1,195 and a loss on derivative instruments of $917, respectively, in cost of sales. The cumulative present value of the natural gas derivative contracts as of December 31, 2017 were classified as current liabilities in the Consolidated Balance Sheet. As a result of the expiration of the last natural gas contract on December 31, 2018, there is no remaining liability as of December 31, 2018.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. 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 9 – Natural Gas Derivative Instruments. 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, 2018 Level 1 Level 2 Level 3 Total Liabilities: Derivative instruments $ — $ — $ — $ — Total fair value $ — $ — $ — $ — Fair value as of December 31, 2017 Level 1 Level 2 Level 3 Total Liabilities: Derivative instruments $ — $ (2,537 ) $ — $ (2,537 ) Total fair value $ — $ (2,537 ) $ — $ (2,537 ) At December 31, 2018, the fair value of the Company’s long-term debt approximated the carrying value.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	11. 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. In May 2017, the shareholders approved the Amended and Restated 2014 CARBO Ceramics Inc. Omnibus Incentive Plan (the “Amended 2014 Omnibus Plan”). Under the Amended 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 Amended 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 1,450,000 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 100,000 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, 2018, 481,883 shares were available for issuance under the Amended 2014 Omnibus Incentive Plan. A summary of restricted stock activity and related information for the year ended December 31, 2018 is presented below: Weighted- Average Grant-Date Fair Value Shares Per Share Nonvested at January 1, 2018 441,119 $ 14.87 Granted 334,638 $ 12.16 Vested (200,394 ) $ 18.20 Forfeited (33,803 ) $ 11.99 Nonvested at December 31, 2018 541,560 $ 12.14 As of December 31, 2018, there was $3,644 of total unrecognized compensation cost related to restricted shares granted under Amended and Restated 2014 Omnibus Incentive Plan. That cost is expected to be recognized over a weighted-average period of 1.6 years. The weighted-average grant date fair value of restricted stock granted during the years ended December 31, 2018 and 2017 was $12.16 and $10.30, respectively. The total fair value of shares vested during the years ended December 31, 2018 and 2017 was $1,567 and $2,023, respectively. As of December 31, 2018, the Company’s outstanding market-based cash awards to certain executives of the Company had a total Target Award of $3,034. 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 of the year each grant was made. During the year ended December 31, 2018, a total of $526 was paid relating to the 2015 grant, which was approximately 76% of the target award. We expect to pay $708 in 2019 relating to the 2016 grant, which is approximately 61% of the target award. The Company also made phantom stock awards to key employees pursuant to the Amended 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, 2018, there were 214,616 units of phantom stock granted under the Amended 2014 Omnibus Incentive Plan, of which 54,020 have vested and 23,511 have been forfeited. As of December 31, 2018, nonvested units of phantom stock under the Amended 2014 Omnibus Incentive Plan have a total value of $477, a portion of which is accrued as a liability within Accrued Payroll and Benefits.

Loss Per Share

Loss Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Loss Per Share	12. Loss Per Share ASC Topic 260, “ Earnings Per Share The Warrant entitles the holder thereof to purchase up to 523,022 shares of the Common Stock, at an exercise price of $14.91 per share, payable in cash. The following table sets forth the computation of basic and diluted loss per share under the two-class method: 2018 2017 Numerator for basic and diluted loss per share: Net loss $ (75,433 ) $ (253,116 ) Effect of reallocating undistributed earnings of participating securities — — Net loss available under the two-class method $ (75,433 ) $ (253,116 ) Denominator: Denominator for basic loss per share—weighted-average shares 27,015,994 26,664,247 Effect of dilutive potential common shares — — Denominator for diluted loss per share—adjusted weighted-average shares 27,015,994 26,664,247 Basic loss per share $ (2.79 ) $ (9.49 ) Diluted loss per share $ (2.79 ) $ (9.49 )

Quarterly Operating Results__(U

Quarterly Operating Results––(Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Operating Results––(Unaudited)	13. Quarterly Operating Results––(Unaudited) Quarterly results for the years ended December 31, 2018 and 2017 were as follows: Three Months Ended March 31 June 30 September 30 December 31 2018 Revenues $ 49,367 $ 57,989 $ 53,819 $ 49,570 Gross loss (10,015 ) (1,152 ) (4,753 ) (6,769 ) Net loss (22,272 ) (14,812 ) (16,736 ) (21,613 ) Loss per share: Basic $ (0.83 ) $ (0.55 ) $ (0.62 ) $ (0.80 ) Diluted $ (0.83 ) $ (0.55 ) $ (0.62 ) $ (0.80 ) 2017 Revenues $ 34,670 $ 43,572 $ 50,173 $ 60,341 Gross loss (19,458 ) (13,433 ) (14,523 ) (5,911 ) Net loss (32,444 ) (24,822 ) (178,465 ) (17,384 ) Earnings per share: Basic $ (1.22 ) $ (0.93 ) $ (6.69 ) $ (0.65 ) Diluted $ (1.22 ) $ (0.93 ) $ (6.69 ) $ (0.65 ) Quarterly data may not sum to full year data reported in the Consolidated Financial Statements due to rounding.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Information	14. Segment Information The Company has two operating segments: 1) Oilfield and Industrial Technologies and Services and 2) Environmental Technologies and Services. Discrete financial information is available for each operating segment. Management of each operating segment reports to our Chief Executive Officer, the Company’s chief operating decision maker, who regularly evaluates income before income taxes as the measure to evaluate segment performance and to allocate resources. The accounting policies of each segment are the same as those described in the summary of significant accounting policies in Note 1. The Company’s Oilfield and Industrial Technologies and Services segment manufactures and sells technology ceramic products and services, base ceramic proppant and frac sand for both the oilfield and industrial sectors. These products have different technology features and product characteristics, which vary based on the application for which they are intended to be used. The various ceramic products’ manufacturing processes are similar. Oilfield ceramic technology products, base ceramic proppant and frac sand proppant are manufactured and sold to pressure pumping companies and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. This segment also promotes increased production and Estimated Ultimate Recovery (“EUR”) of oil and natural gas by providing industry-leading technology to Design, Build, and Optimize the Frac ® Our industrial ceramic technology products are manufactured at the same facilities and using the same machinery and equipment as the oilfield products, however they are sold to industrial companies. These products are designed for use in various industrial technology applications, including, but not limited to, casting and milling. Our chief operating decision maker reviews discreet financial information as a whole for all of our manufacturing, consulting and software businesses. Manufacturing includes the manufacture of technology products, base ceramics, industrial ceramics, sand and contract manufacturing, regardless of the industry the products are ultimately sold to. See Note 2 for disaggregated revenue information. Our Environmental Technologies and Services segment designs, manufactures and sells products and services intended to protect operators’ assets, minimize environmental risks, and lower lease operating expense (“LOE”). AGPI, a wholly-owned subsidiary of ours, provides spill prevention, containment and countermeasure systems for the oil and gas industry. AGPI uses proprietary technology designed to enable its clients to extend the life of their storage assets, reduce the potential for hydrocarbon spills and provide containment of stored materials. Summarized financial information for the Company’s operating segments for the two-year period ended December 31, 2018 is shown in the following tables. Intersegment sales are not material. Oilfield and Industrial Technologies and Services Environmental Technologies and Services Total ($ in thousands) 2018 Revenue from external customers $ 178,609 $ 32,136 $ 210,745 (Loss) income before income taxes (77,264 ) 2,723 (74,541 ) Total assets 456,416 17,950 474,366 Capital expenditures 1,093 946 2,039 Depreciation and amortization 33,452 1,153 34,605 2017 Revenue from external customers $ 165,557 $ 23,199 $ 188,756 Loss before income taxes (255,097 ) (46 ) (255,143 ) Total assets 524,952 15,646 540,598 Capital expenditures 2,371 227 2,598 Depreciation and amortization 43,005 1,277 44,282 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: 2018 2017 Long-lived assets: United States $ 272,903 $ 326,665 International 5,910 6,482 Total $ 278,813 $ 333,147 Revenues outside the United States accounted for 19% and 21% of the Company’s revenues for 2018 and 2017, respectively. Revenues for the years ended December 31 in the United States, Canada and other countries are as follows: 2018 2017 Revenues: United States $ 171,167 $ 149,041 Canada 6,086 7,439 Other international 33,492 32,276 Total $ 210,745 $ 188,756 Sales to Customers The following schedule presents customers, primarily from the Oilfield and Industrial Technologies and Services segment, from whom the Company derived 10% or more of total revenues for the years ended December 31: A B 2018 12.7 % 13.7 % 2017 16.1 % 10.2 %

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2018
Postemployment Benefits [Abstract]
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: 2018 2017 Contributions: Profit sharing $ — $ — Savings 1,142 953 $ 1,142 $ 953 All contributions to the plans are 100% participant directed. During 2018, participants were allowed to invest up to 10% of contributions in the Company’s Common Stock. As of January 1, 2019, participants may not make any new contributions in the Company’s Common Stock.

Commitments

Commitments	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments	16. Commitments The Company has an agreement with a supplier to purchase at least 50 percent of the annual kaolin requirements for the Eufaula, Alabama plant at specified contract prices. In May 2017, the agreement was extended for an additional three years. For the years ended December 31, 2018 and 2017, the Company purchased from the supplier $1,141 and $2,207, respectively, of kaolin under the agreement. The Company has a mining agreement with a contractor to purchase 100% percent of the annual kaolin requirements for the Company’s McIntyre and Toomsboro, Georgia plants at specified contract prices, from lands owned or leased by either the Company or the contractor. The agreement remains in effect until such time as all Company-owned minerals have been depleted. For the years ended December 31, 2018 and 2017, the Company purchased $2,161 and $950, respectively, of kaolin under the agreement. The Company had an agreement with a supplier to provide frac sand for the Company’s Marshfield, Wisconsin plant at a specified contract price. The terms of the agreement required the Company to purchase minimum annual amounts and remained in effect until the specified sand was depleted. For the years ended December 31, 2018 and 2017, the Company purchased $2,452 and $3,837, respectively, of frac sand under this agreement. The mine was depleted in 2018 and there are no future commitments under this agreement. The Company has an agreement with a supplier to purchase wet sand at specified contract prices. The two-year agreement began January 1, 2018 and requires the Company to purchase 720,000 tons over the two-year contract. Any shortfall would be due from the Company at two dollars per ton. As of December 31, 2018, there was approximately 435,000 remaining to be purchased under the agreement. For the year ended December 31, 2018, the Company purchased $4,586 of wet sand under this agreement. In addition, the Company has an agreement with a sand processing company to process sand at specified prices. The two year agreement also began January 1, 2018 and requires the Company to process at least 10,000 tons per month on a rolling three-month average. Any shortfall would be due from the Company at seven dollars per ton. The Company provided an upfront capital infusion to the sand processing company to facilitate the processing of wet sand and will be repaid to the Company as an offset to future sand processing charges. As of December 31, 2018, the total amount due to the Company relating to the unrecovered capital infusion and other receivables was approximately $716, which is recorded within prepaid expenses and other current assets. For the year ended December 31, 2018, the Company spent $2,369 in net sand processing charges under this agreement. The Company had an agreement with a supplier to provide hydro sized sand for the Company’s Marshfield, Wisconsin plant at a specified contract price. The Company agreed to purchase a minimum of 40,000 tons with the option to purchase additional hydro sized sand at the Company’s discretion. As of December 31, 2018, the Company purchased $1,077 of hydro sized sand under this agreement. As of December 31, 2017, the Company had not yet purchased any hydro sized sand under this agreement. There are no further commitments under this agreement. The Company entered into a lease agreement dated November 1, 2008 (“2008 Agreement”) with the Development Authority of Wilkinson County (the “Wilkinson County Development Authority”). 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 administrative fee of $50 per year. The Company elected the renewal option on November 1, 2017, which extended the lease through November 1, 2021. At any time prior to the scheduled termination of the 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 Authority. The Company has also entered into a Memorandum of Understanding (the “MOU”) with the Development Authority 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 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 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 Development Authority of Wilkinson County has not challenged the Company’s declaring a force majeure. The properties subject to these lease agreements are included in Property, Plant and Equipment (net book value of $104,179 at December 31, 2018) in the accompanying consolidated financial statements.

Employment Agreements

Employment Agreements	12 Months Ended
	Dec. 31, 2018
Compensation Related Costs [Abstract]
Employment Agreements	17. Employment Agreements The Company has an employment agreement through December 31, 2019 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.

Sale of Russian Proppant Busine

Sale of Russian Proppant Business	12 Months Ended
	Dec. 31, 2018
Russian Proppant
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of Business	18. Sale of Russian Proppant Business On July 21, 2017, subsidiaries of the Company Carbo Ceramics (Mauritius) Inc. and Carbo LLC (together, the “Sellers”) entered into a Share Purchase Agreement with Petro Welt Technologies AG and PeWeTe Evolution Limited (together, the “Purchasers”) to sell the Company’s Russian proppant business. The adjusted purchase price was approximately $26,000 for all of the shares of CARBO Ceramics Cyprus Limited held by the Sellers. The transaction received local regulatory approval and closed on September 21, 2017. The net assets included in the calculation of the loss on the sale were $17,754, including cash and cash equivalents of $846, accounts receivable of $6,047, total inventory of $8,573, net PP&E of $2,763, other net assets of $670, and accrued expenses of $1,145. The Company incurred approximately $1,646 in expenses relating to the sale. Gain on the sale before consideration of the cumulative translation adjustment was approximately $6,599. However, as a result of the sale, the Company reclassified the foreign currency cumulative translation loss of $33,347 from accumulated other comprehensive loss within shareholders’ equity to net loss which offset the initial gain on the sale. As a result, the Company’s net loss on the sale was approximately $26,747, presented as a separate line item within operating loss on the consolidated statement of operations. As of December 31, 2017, the Company was owed $4,000 related to net debt and net working capital purchase price adjustments. In January 2018, the Company filed a Notice of Arbitration related to this purchase price adjustment against the Purchasers. During the second quarter of 2018, the Company settled the dispute with the Purchasers. Terms of the settlement required the Purchasers to pay $3,650, and as a result we recorded a loss of $350. In July 2018, we received the settlement proceeds of approximately $3,650, which is included within investing cash flows on the consolidated statement of cash flows for the year ended December 31, 2018. As of December 31, 2018, the Company does not have a material net investment that is subject to foreign currency fluctuations.

Sale of Millen Facility

Sale of Millen Facility	12 Months Ended
	Dec. 31, 2018
Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of Business	19. Sale of Millen Facility On December 31, 2018, the Company entered into a Purchase and Sale Agreement with a Buyer to sell the Company’s ceramic proppant manufacturing facility in Millen, Georgia for $23,000. The transaction closed on December 31, 2018. Selling expenses, including certain post-closing matters and retained liabilities, totaled approximately $7,267. As of December 31, 2018, the Company had paid approximately $899 of the total selling expenses. As such, net proceeds of $22,101 is included within investing cash flows on the consolidated statement of cash flows for the year ended December 31, 2018. The selling expenses that had not yet been paid as of December 31, 2018 primarily relate to the post-closing matters and retained liabilities, and are recorded as liabilities as of December 31, 2018 within other accrued expenses, other current liabilities and other long-term liabilities on the consolidated balance sheets. The payment of the post-closing matters will be an investing cash outflow when paid, and the repayment of the retained liabilities will be financing outflows when repaid over a multi-year period. Net Cash Proceeds, as defined in the New Credit Agreement, is expected to approximate $15,733, calculated as the gross proceeds of $23,000 less the selling expenses of $7,267. See Note 4. The retained liabilities, due to the City of Millen and the local electrical cooperative, are associated with their respective investments in the Millen facility’s electrical and natural gas infrastructure during the construction of the plant. The Company also retained an existing liability associated with a long-term fixed natural gas transportation agreement. These retained liabilities, totaling approximately $4,852, will be repaid over a multi-year period and are included in other current liabilities and other long-term liabilities. As of December 31, 2018, the fair value of these retained liabilities approximated the carrying value. Subsequent to the balance sheet date, the Company executed a note payable with the local electrical cooperative for its share of the retained liabilities with a principal balance equal to the liability recorded at December 31, 2018. The note bears interest at 5% annually and requires monthly principal and interest payments of $35 until maturity in February 2024. In order to backstop the amounts due under these retained liabilities, the Company agreed to an escrow holdback of $3,000 at closing and provided a letter of credit for an additional $2,000. The letter of credit will be reduced by $400 each year until maturity. The Company also agreed to a separate escrow holdback of $1,200 pending completion of the post-closing matters. The book value of the assets held for sale was $17,842, which after consideration of the selling price, the write-off of certain spare parts totaling $196 and costs to sell the facility, resulted in a loss on the sale of $2,305.

Legal Proceedings and Regulator

Legal Proceedings and Regulatory Matters	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Legal Proceedings and Regulatory Matters	20. 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, 2018
Subsequent Events [Abstract]
Subsequent Events	21. Subsequent Events In January 2019, the Company awarded the following: 468,984 shares of restricted stock to certain employees. The fair value of the stock award on the date of grant totaled $2,298, which will be recognized as expense, less actual forfeitures as they occur, on a straight-line basis over the three-year vesting period. 105,276 units of phantom shares to certain employees. The fair value of the phantom shares on the date of grant totaled $516. Compensation expense for these shares will be recognized over the three-year vesting period. The amount of compensation expense recognized each period will be based on the fair value of the Company’s common stock at the end of each period.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
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, as well as industrial and environmental industries. 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, 2018 and 2017 was $1,279 and $1,602, respectively. Other receivables were $442 and $546 as of December 31, 2018 and 2017, 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.
Restricted Cash	Restricted Cash A portion of the Company’s cash balance is restricted to its use in order to provide collateral primarily for letters of credit and funds held in escrow relating to the sale of its Millen plant. As of December 31, 2018 and 2017, total restricted cash was $10,565 and 10,216, respectively.
Inventories	Inventories Inventories are stated at the lower of net realizable value or cost. 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 evaluated the carrying values of its inventories and concluded that no adjustments were required in 2018 or 2017.
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 2,957 acres of land and leasehold interests containing kaolin reserves near its plants in Georgia and Alabama. The Company also holds approximately 469 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 5 – Other Operating (Income) Expense.
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 years ended December 31, 2018 and 2017, the Company expensed $32,509 and $40,664, respectively, in production costs.
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 5 – Other Operating (Income) Expense.
Revenue Recognition	Revenue Recognition Revenue from proppant sales is recognized when title passes to the customer, generally upon delivery. Revenue from consulting and contract manufacturing 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. There were no start-up costs for 2018 and 2017.
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 2018 and 2017 were $3,823 and $4,417, respectively.
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which amends current lease guidance. This guidance requires, among other things, that lessees recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessees and lessors must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. In July 2018, the FASB issued ASU No. 2018-11, “Leases (Topic 842): Targeted Improvements”, which simplifies the implementation by allowing entities the option to instead apply the provisions of the new guidance at the effective date, without adjusting the comparative periods presented. The new lease guidance will be effective for the interim and annual periods beginning after December 15, 2018 with early adoption permitted. The Company adopted this guidance effective January 1, 2019 without adjusting the comparative periods. During the first quarter of 2019, the Company expects its ROU asset will be within a range of $54,000 to $60,000 and its total lease liability will be within a range of $62,000 to $68,000. In addition, upon implementation, the Company’s deferred rent balances, recorded primarily within other long-term liabilities and accrued expenses as of December 31, 2018, of approximately $8,300 will be offset with the lease liability. The Company has implemented a lease accounting system for accounting for leases under the new standard. There were no significant impacts to the consolidated statement of operations and consolidated statement of cash flows. In August 2015, the FASB issued ASU No. 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 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’s analysis of sales contracts under ASC 606 supports the recognition of revenue at a point in time, typically when title passes to the customer upon delivery, for the majority of contracts, which is consistent with the current revenue recognition model. The Company utilized the modified retrospective approach, which requires a cumulative adjustment to retained earnings and no adjustments to prior periods. The Company adopted this guidance as of January 1, 2018. There was no material impact on the Company’s consolidated financial statements or disclosures.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
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

Disaggregated Revenue (Tables)

Disaggregated Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Disaggregation Of Revenue [Abstract]
Schedule of Disaggregates Revenue by Product Line	The following table disaggregates revenue by product line for the years ended December 31: 2018 2017 Technology products and services $ 50,917 $ 43,383 Industrial products and services 14,873 12,030 Base ceramic and sand proppants 112,819 110,144 Oilfield and Industrial Technologies and Services segment 178,609 165,557 Environmental Technologies and Services segment 32,136 23,199 $ 210,745 $ 188,756

Intangible and Other Assets (Ta

Intangible and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Intangible And Other Assets [Abstract]
Summary of Intangible Assets	Following is a summary of intangible assets as of December 31: 2018 2017 Weighted Average Life Gross Amount Accumulated Amortization Gross Amount Accumulated Amortization Intangibles: Patents and licenses, software and hardware designs 6 years $ 5,177 $ 3,430 $ 5,320 $ 3,540 Developed technology 10 years 2,782 2,573 2,782 2,295 Customer relationships and non-compete 9 years 2,838 2,838 2,838 2,621 $ 10,797 $ 8,841 $ 10,940 $ 8,456
Other Assets	Following is a summary of other assets as of December 31: 2018 2017 Other assets: Inventories - bauxite raw materials $ 4,160 $ 3,527 Other 1,034 5,434 $ 5,194 $ 8,961

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
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, 2018 are as follows: 2019 $ 15,331 2020 16,893 2021 16,484 2022 12,562 2023 9,216 Thereafter 16,458 Total $ 86,944

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
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: 2018 2017 Deferred tax assets: Employee benefits $ 829 $ 836 Inventories 3,902 2,309 Natural gas derivatives — 610 Goodwill & other intangibles 2,350 3,179 Net operating loss 88,341 59,536 Foreign tax credits 667 667 Interest 2,200 552 Accrued expenses 3,496 — Other 352 1,477 Total deferred tax assets 102,137 69,166 Deferred tax liabilities: Depreciation 30,054 14,332 Indefinite-lived intangibles 817 209 Foreign — 26 Total deferred tax liabilities 30,871 14,567 Valuation Allowance 72,380 54,829 Net deferred tax liabilities $ (1,114 ) $ (230 )
Significant Components of Provision for Income Taxes	Significant components of the provision for income taxes for the years ended December 31 are as follows: 2018 2017 Current: Federal $ — $ (375 ) State (34 ) (99 ) Foreign 42 581 Total current 8 107 Deferred 884 (2,134 ) $ 892 $ (2,027 )
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: 2018 2017 Amount Percent Amount Percent U.S. statutory rate $ (15,658 ) (21.0 )% $ (89,300 ) (35.0 )% State income taxes, net of federal tax benefit (2,152 ) (2.9 ) (5,684 ) (2.2 ) Mining depletion (163 ) (0.2 ) (619 ) (0.2 ) Change in election for foreign tax credits 32 — (667 ) (0.3 ) Foreign investments 271 0.4 8,569 3.4 Stock compensation excess tax deficiency 348 0.5 876 0.3 Other permanent differences 663 0.9 1,806 0.7 Tax reform deferred rate change — — 28,163 11.0 Valuation allowance 17,551 23.5 54,829 21.5 $ 892 1.2 % $ (2,027 ) (0.8 )%

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
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, 2018 Level 1 Level 2 Level 3 Total Liabilities: Derivative instruments $ — $ — $ — $ — Total fair value $ — $ — $ — $ — Fair value as of December 31, 2017 Level 1 Level 2 Level 3 Total Liabilities: Derivative instruments $ — $ (2,537 ) $ — $ (2,537 ) Total fair value $ — $ (2,537 ) $ — $ (2,537 )

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Restricted Stock Activity and Related Information	A summary of restricted stock activity and related information for the year ended December 31, 2018 is presented below: Weighted- Average Grant-Date Fair Value Shares Per Share Nonvested at January 1, 2018 441,119 $ 14.87 Granted 334,638 $ 12.16 Vested (200,394 ) $ 18.20 Forfeited (33,803 ) $ 11.99 Nonvested at December 31, 2018 541,560 $ 12.14

Loss Per Share (Tables)

Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Loss per Share under Two-Class Method	The following table sets forth the computation of basic and diluted loss per share under the two-class method: 2018 2017 Numerator for basic and diluted loss per share: Net loss $ (75,433 ) $ (253,116 ) Effect of reallocating undistributed earnings of participating securities — — Net loss available under the two-class method $ (75,433 ) $ (253,116 ) Denominator: Denominator for basic loss per share—weighted-average shares 27,015,994 26,664,247 Effect of dilutive potential common shares — — Denominator for diluted loss per share—adjusted weighted-average shares 27,015,994 26,664,247 Basic loss per share $ (2.79 ) $ (9.49 ) Diluted loss per share $ (2.79 ) $ (9.49 )

Quarterly Operating Results___2

Quarterly Operating Results––(Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Operating Results	Quarterly results for the years ended December 31, 2018 and 2017 were as follows: Three Months Ended March 31 June 30 September 30 December 31 2018 Revenues $ 49,367 $ 57,989 $ 53,819 $ 49,570 Gross loss (10,015 ) (1,152 ) (4,753 ) (6,769 ) Net loss (22,272 ) (14,812 ) (16,736 ) (21,613 ) Loss per share: Basic $ (0.83 ) $ (0.55 ) $ (0.62 ) $ (0.80 ) Diluted $ (0.83 ) $ (0.55 ) $ (0.62 ) $ (0.80 ) 2017 Revenues $ 34,670 $ 43,572 $ 50,173 $ 60,341 Gross loss (19,458 ) (13,433 ) (14,523 ) (5,911 ) Net loss (32,444 ) (24,822 ) (178,465 ) (17,384 ) Earnings per share: Basic $ (1.22 ) $ (0.93 ) $ (6.69 ) $ (0.65 ) Diluted $ (1.22 ) $ (0.93 ) $ (6.69 ) $ (0.65 )

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Financial Information for Operating Segments	Summarized financial information for the Company’s operating segments for the two-year period ended December 31, 2018 is shown in the following tables. Intersegment sales are not material. Oilfield and Industrial Technologies and Services Environmental Technologies and Services Total ($ in thousands) 2018 Revenue from external customers $ 178,609 $ 32,136 $ 210,745 (Loss) income before income taxes (77,264 ) 2,723 (74,541 ) Total assets 456,416 17,950 474,366 Capital expenditures 1,093 946 2,039 Depreciation and amortization 33,452 1,153 34,605 2017 Revenue from external customers $ 165,557 $ 23,199 $ 188,756 Loss before income taxes (255,097 ) (46 ) (255,143 ) Total assets 524,952 15,646 540,598 Capital expenditures 2,371 227 2,598 Depreciation and amortization 43,005 1,277 44,282
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: 2018 2017 Long-lived assets: United States $ 272,903 $ 326,665 International 5,910 6,482 Total $ 278,813 $ 333,147 2018 2017 Revenues: United States $ 171,167 $ 149,041 Canada 6,086 7,439 Other international 33,492 32,276 Total $ 210,745 $ 188,756
Schedule of Total Revenue from Major Customers	The following schedule presents customers, primarily from the Oilfield and Industrial Technologies and Services segment, from whom the Company derived 10% or more of total revenues for the years ended December 31: A B 2018 12.7 % 13.7 % 2017 16.1 % 10.2 %

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Postemployment Benefits [Abstract]
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: 2018 2017 Contributions: Profit sharing $ — $ — Savings 1,142 953 $ 1,142 $ 953

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)a	Dec. 31, 2017USD ($)	Mar. 31, 2019USD ($)
Significant Accounting Policies [Line Items]
Severance costs	$ 924,000	$ 287,000
Allowance for doubtful accounts	1,279,000	1,602,000
Other receivables	442,000	546,000
Restricted cash	10,565,000	10,216,000
Lower of cost or market inventory adjustment	0	0
Production cost	32,509,000	40,664,000
Start-up costs	0	0
Research and development expenses	$ 3,823,000	$ 4,417,000
Accounting Standards Update 2018-11 | Other Long Term Liabilities and Accrued Expenses | Subsequent Event
Significant Accounting Policies [Line Items]
Deferred rent			$ 8,300,000
Georgia and Alabama
Significant Accounting Policies [Line Items]
Area of land and leasehold interests | a	2,957
Marshfield, Wisconsin
Significant Accounting Policies [Line Items]
Area of land and leasehold interests | a	469
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
Maximum | Accounting Standards Update 2018-11 | Subsequent Event
Significant Accounting Policies [Line Items]
Company's ROU asset			60,000,000
Total lease liability			68,000,000
Minimum | Accounting Standards Update 2018-11 | Subsequent Event
Significant Accounting Policies [Line Items]
Company's ROU asset			54,000,000
Total lease liability			$ 62,000,000
Eufaula and Alabama
Significant Accounting Policies [Line Items]
Percentage of value of assets of project on construction in progress	82.00%
Projects completed percentage	75.00%

Estimated Useful Lives of Prope

Estimated Useful Lives of Property Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
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
Property, Plant and Equipment [Line Items]
Estimated useful lives of property plant and equipment	30 years

Disaggregated Revenue - Schedul

Disaggregated Revenue - Schedule of Disaggregates Revenue by Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue by product line	$ 49,570	$ 53,819	$ 57,989	$ 49,367	$ 60,341	$ 50,173	$ 43,572	$ 34,670	$ 210,745	$ 188,756
Environmental Technologies and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line									32,136	23,199
Oilfield and Industrial Technologies and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line									178,609	165,557
Oilfield and Industrial Technologies and Services | Technology Products and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line									50,917	43,383
Oilfield and Industrial Technologies and Services | Industrial Products and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line									14,873	12,030
Oilfield and Industrial Technologies and Services | Base Ceramic and Sand Proppants
Disaggregation Of Revenue [Line Items]
Revenue by product line									$ 112,819	$ 110,144

Summary of Intangible Assets (D

Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Intangible Asset by Major Class [Line Items]
Intangible Assets, Gross Amount (Excluding Goodwill), Total	$ 10,797	$ 10,940
Finite-Lived Intangible Assets, Accumulated Amortization	$ 8,841	8,456
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 Amount	$ 5,177	5,320
Finite-Lived Intangible Assets, Accumulated Amortization	$ 3,430	3,540
Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Weighted Average Life	10 years
Finite-Lived Intangible Assets, Gross Amount	$ 2,782	2,782
Finite-Lived Intangible Assets, Accumulated Amortization	$ 2,573	2,295
Customer relationships and non-compete
Schedule of Intangible Asset by Major Class [Line Items]
Weighted Average Life	9 years
Finite-Lived Intangible Assets, Gross Amount	$ 2,838	2,838
Finite-Lived Intangible Assets, Accumulated Amortization	$ 2,838	$ 2,621

Intangible and Other Assets - A

Intangible and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible And Other Assets [Line Items]
Amortization expense for intangible assets	$ 889	$ 921
Estimated amortization expense for intangible assets for year one	602
Estimated amortization expense for intangible assets for year two	341
Estimated amortization expense for intangible assets for year three	324
Estimated amortization expense for intangible assets for year four	40
Estimated amortization expense for intangible assets for year five	0
Other assets	1,034	5,434
Russian Proppant
Intangible And Other Assets [Line Items]
Loss on sale of business	350	26,747
Russian Proppant | Receivable Related to Money Owed from Sale of Business
Intangible And Other Assets [Line Items]
Other assets		$ 4,000
Proceeds from settlement of receivable	3,650
Loss on sale of business	$ 350

Other Assets (Detail)

Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Line Items]
Other	$ 1,034	$ 5,434
Other Assets, Total	5,194	8,961
Bauxite raw materials
Other Assets [Line Items]
Inventories - bauxite raw materials	$ 4,160	$ 3,527

Long-Term Debt and Notes Paya_2

Long-Term Debt and Notes Payable - Additional Information (Detail)	Oct. 01, 2017USD ($)	Apr. 01, 2017USD ($)	Mar. 02, 2017USD ($)Subsidiary$ / sharesshares	May 31, 2016USD ($)BoardofDirector	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Long-term debt					$ 45,650,000	$ 60,698,000
Repayments of long-term debt						3,250,000
Long-term debt, current portion					15,733,000
Increase in additional paid-in capital due to issuance of warrant						3,870,000
PIK interest payment						2,040,000
Interest cost					8,612,000	8,058,000
Unsecured Promissory Notes
Line of Credit Facility [Line Items]
Debt instrument, maturity date				Apr. 1, 2019
Debt instrument, interest rate				7.00%
Proceeds from issuance of notes				$ 25,000,000
Debt instrument, payable number | BoardofDirector				2
PIK interest payment	$ 1,043,000	$ 997,000
Notes outstanding principal balance					$ 27,040,000
Millen, Georgia Facility
Line of Credit Facility [Line Items]
Percentage of usage requirement in net cash proceed from sale of business					100.00%
New Credit Agreement
Line of Credit Facility [Line Items]
Long-term debt					$ 65,000,000
New Credit Agreement | Unsecured Promissory Notes
Line of Credit Facility [Line Items]
Debt instrument, payment terms					Interest payments at 8.00% until the lenders under the New Credit Agreement receive two consecutive semi-annual cash interest payments.
Debt instrument, frequency of periodic payment					Semi-annual
Debt instrument, payment-in-kind interest rate			8.00%
Wilks | New Credit Agreement
Line of Credit Facility [Line Items]
Long-term debt			$ 65,000,000
Debt instrument, maturity date					Dec. 31, 2022
Debt instrument, interest rate			9.00%
Number of operating subsidiaries | Subsidiary			2
Unamortized debt issuance costs					$ 683,000
Warrants exercise price per share | $ / shares			$ 14.91
Warrants expiration date			Dec. 31, 2022
Percentage of common stock outstanding owned					11.20%
Percentage of common stock outstanding would hold upon exercise of warrant to purchase additional shares					12.80%
Increase in additional paid-in capital due to issuance of warrant					$ 3,871,000
Wilks | New Credit Agreement | Maximum
Line of Credit Facility [Line Items]
Warrant entitles to purchase shares of the common stock | shares			523,022
Wilks | New Credit Agreement | Warrant
Line of Credit Facility [Line Items]
Unamortized original issue discount					2,934,000
Wells Fargo | New Credit Agreement
Line of Credit Facility [Line Items]
Repayments of long-term debt			$ 52,651,000
Term Loan Closing to Pay off Wells Fargo | Wilks | New Credit Agreement
Line of Credit Facility [Line Items]
Long-term debt			52,651,000
Additional Term Loan | Wilks | New Credit Agreement
Line of Credit Facility [Line Items]
Long-term debt			$ 12,349,000
Standby Letters of Credit | Wells Fargo | Amended Credit Agreement
Line of Credit Facility [Line Items]
Letters of credit outstanding					$ 2,625,000	$ 9,230,000

Other Operating (Income) Expe_2

Other Operating (Income) Expense - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2018USD ($)Distribution	Dec. 31, 2017USD ($)
Other Operating Income Expenses [Line Items]
Number of distribution centers | Distribution		1
Fair value estimated			$ (2,537,000)
Millen, Georgia Facility
Other Operating Income Expenses [Line Items]
Value of comparable building per square foot	35
Impairment of long-lived assets	$ 125,759,000	$ 0
Consideration receivable on sale of plant		23,000,000
Millen, Georgia Facility | Fair Value, Inputs, Level 3
Other Operating Income Expenses [Line Items]
Fair value estimated	$ 18,756,000
Millen, Georgia Facility | Discontinued Operations, Held-for-sale
Other Operating Income Expenses [Line Items]
Carrying value of assets held for sale		$ 17,842,000
Millen, Georgia Facility | Construction Documents and Historical Expenditures
Other Operating Income Expenses [Line Items]
Fair value downward adjustment percentage	65.00%
Millen, Georgia Facility | Building and Building Improvements
Other Operating Income Expenses [Line Items]
Fair value downward adjustment percentage	94.00%
Minimum | Millen, Georgia Facility
Other Operating Income Expenses [Line Items]
Percentage of salvage value	12.00%
Value of comparable building per square foot	30
Maximum | Millen, Georgia Facility
Other Operating Income Expenses [Line Items]
Percentage of salvage value	50.00%
Value of comparable building per square foot	40

Net Minimum Future Rental Payme

Net Minimum Future Rental Payments Due Under Non-Cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Property, plant and equipment, operating lease payments
2,019	$ 15,331
2,020	16,893
2,021	16,484
2,022	12,562
2,023	9,216
Thereafter	16,458
Total	$ 86,944

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Sublease income	$ 4,142	$ 3,040
Rent expense for all operating leases	$ 16,936	$ 20,310

Significant Components of Defer

Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Employee benefits	$ 829	$ 836
Inventories	3,902	2,309
Natural gas derivatives		610
Goodwill & other intangibles	2,350	3,179
Net operating loss	88,341	59,536
Foreign tax credits	667	667
Interest	2,200	552
Accrued expenses	3,496
Other	352	1,477
Total deferred tax assets	102,137	69,166
Deferred tax liabilities:
Depreciation	30,054	14,332
Indefinite-lived intangibles	817	209
Foreign		26
Total deferred tax liabilities	30,871	14,567
Valuation Allowance	72,380	54,829
Net deferred tax liabilities	$ (1,114)	$ (230)

Significant Components of Provi

Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal		$ (375)
State	$ (34)	(99)
Foreign	42	581
Total current	8	107
Deferred	884	(2,134)
Income taxes	$ 892	$ (2,027)

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, 2017	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of income taxes amount
U.S. statutory rate		$ (15,658)	$ (89,300)
State income taxes, net of federal tax benefit		(2,152)	(5,684)
Mining depletion		(163)	(619)
Change in election for foreign tax credits		32	(667)
Foreign investments		271	8,569
Stock compensation excess tax deficiency		348	876
Other permanent differences		663	1,806
Tax reform deferred rate change	$ 28,163		28,163
Valuation allowance		17,551	54,829
Income taxes		$ 892	$ (2,027)
Reconciliation of income taxes rate
U.S. statutory rate		(21.00%)	(35.00%)
State income taxes, net of federal tax benefit		(2.90%)	(2.20%)
Mining depletion		(0.20%)	(0.20%)
Change in election for foreign tax credits			(0.30%)
Foreign investments		0.40%	3.40%
Stock compensation excess tax deficiency		0.50%	0.30%
Other permanent differences		0.90%	0.70%
Tax reform deferred rate change			11.00%
Valuation allowance		23.50%	21.50%
Effective Income Tax Rate, Continuing Operations, Total		1.20%	(0.80%)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Disclosure [Line Items]
Deferred tax assets, valuation allowance	$ 54,829,000	$ 72,380,000	$ 54,829,000
Tax reform deferred rate change	28,163,000		28,163,000
Foreign investments benefit		0	0
Decreased income tax benefit		271,000	8,569,000
Net operating loss carryforwards	$ 59,536,000	88,341,000	$ 59,536,000
Net operating losses carry forwards, expiration year			2,037	2,036
Uncertain tax positions		0
Tax Years 2012 Through 2014
Income Taxes Disclosure [Line Items]
Income tax refund claimed		$ 2,107,000

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail)	12 Months Ended	29 Months Ended
	Dec. 31, 2018USD ($)Vote$ / sharesshares	Dec. 31, 2018USD ($)Vote$ / sharesshares	Dec. 31, 2017shares	Jul. 28, 2016USD ($)
Stockholders Equity Note [Line Items]
Common stock votes per share | Vote	1	1
Preferred stock, shares authorized | shares	5,000	5,000	5,000
ATM Program
Stockholders Equity Note [Line Items]
Proceeds from sale of common stock under ATM program	$ 2,849,000
ATM Program | Cowen and Company LLC
Stockholders Equity Note [Line Items]
Aggregate offering price authorized				$ 75,000,000
Proceeds from sale of common stock under ATM program gross	2,914,000	$ 49,527,000
Proceeds from sale of common stock under ATM program	2,849,000	48,412,000
Commissions paid	$ 65,000	$ 1,114,000
ATM Program | Common Stock | Cowen and Company LLC
Stockholders Equity Note [Line Items]
Shares sold under ATM program | shares	300,227	3,705,936
Average price per share | $ / shares	$ 9.71	$ 13.36

Natural Gas Derivative Instru_2

Natural Gas Derivative Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Derivative [Line Items]
Remaining derivative liability		$ 2,537,000
Cost of Sales
Derivative [Line Items]
Gain (loss) on derivative instruments	$ 1,195,000	$ (917,000)
Natural gas derivative contract
Derivative [Line Items]
Last derivative contract expired	Dec. 31, 2018
Future natural gas obligations	$ 0
Remaining derivative liability	$ 0
Natural gas derivative contract | Measurement Input, Discount Rate
Derivative [Line Items]
Estimated cash flows, discount rate	8

Fair Value Measurements of Fina

Fair Value Measurements of Financial Assets and Liabilities on Recurring and Non Recurring Basis (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Liabilities:
Derivative instruments	$ (2,537)
Total fair value	(2,537)
Fair Value, Inputs, Level 2
Liabilities:
Derivative instruments	(2,537)
Total fair value	$ (2,537)

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - Amended and Restated 2014 Omnibus Incentive Plan - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to any single participant in any calendar year		100,000
Shares available for issuance under the plan		481,883
Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Cash awards		$ 3,034,000
Deferred compensation payment		$ 526,000
Deferred compensation, percentage		76.00%
Executive Officer | Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation payment	$ 708,000
Deferred compensation, percentage	61.00%
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%
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		1,450,000
Period of years for which the 1,450,000 shares can be granted over		5 years
Minimum | Executive Officer | Beginning January 1, 2015 through December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		0.00%
Employee Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term Period		10 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Unrecognized compensation expense, net		$ 3,644,000
Unrecognized compensation expense, net, weighted average period		1 year 7 months 6 days
Weighted average grant date fair value		$ 12.16	$ 10.30
Total fair value of restricted stock vested		$ 1,567,000	$ 2,023,000
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Units granted		214,616
Units vested		54,020
Units forfeited		23,511
Total fair value of units outstanding		$ 477,000

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Restricted Stock Activity and Related Information (Detail) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Shares
Beginning Balance | shares	441,119
Granted | shares	334,638
Vested | shares	(200,394)
Forfeited | shares	(33,803)
Ending Balance | shares	541,560
Weighted-Average Grant-Date Fair Value Per Share
Beginning Balance | $ / shares	$ 14.87
Granted | $ / shares	12.16
Vested | $ / shares	18.20
Forfeited | $ / shares	11.99
Ending Balance | $ / shares	$ 12.14

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Detail) - New Credit Agreement - Wilks	Mar. 02, 2017$ / sharesshares
Earnings Per Share Basic [Line Items]
Warrants exercise price per share | $ / shares	$ 14.91
Maximum
Earnings Per Share Basic [Line Items]
Warrant entitles to purchase shares of the common stock | shares	523,022

Computation of Basic and Dilute

Computation of Basic and Diluted Loss per Share under Two-Class Method (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator for basic and diluted loss per share:
Net loss	$ (21,613)	$ (16,736)	$ (14,812)	$ (22,272)	$ (17,384)	$ (178,465)	$ (24,822)	$ (32,444)	$ (75,433)	$ (253,116)
Effect of reallocating undistributed earnings of participating securities									0	0
Net loss available under the two-class method									$ (75,433)	$ (253,116)
Denominator:
Denominator for basic loss per share—weighted-average shares									27,015,994	26,664,247
Effect of dilutive potential common shares									0	0
Denominator for diluted loss per share—adjusted weighted-average shares									27,015,994	26,664,247
Basic loss per share	$ (0.80)	$ (0.62)	$ (0.55)	$ (0.83)	$ (0.65)	$ (6.69)	$ (0.93)	$ (1.22)	$ (2.79)	$ (9.49)
Diluted loss per share	$ (0.80)	$ (0.62)	$ (0.55)	$ (0.83)	$ (0.65)	$ (6.69)	$ (0.93)	$ (1.22)	$ (2.79)	$ (9.49)

Quarterly Operating Results (De

Quarterly Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 49,570	$ 53,819	$ 57,989	$ 49,367	$ 60,341	$ 50,173	$ 43,572	$ 34,670	$ 210,745	$ 188,756
Gross loss	(6,769)	(4,753)	(1,152)	(10,015)	(5,911)	(14,523)	(13,433)	(19,458)	(22,689)	(53,325)
Net loss	$ (21,613)	$ (16,736)	$ (14,812)	$ (22,272)	$ (17,384)	$ (178,465)	$ (24,822)	$ (32,444)	$ (75,433)	$ (253,116)
Earnings (loss) per share:
Basic	$ (0.80)	$ (0.62)	$ (0.55)	$ (0.83)	$ (0.65)	$ (6.69)	$ (0.93)	$ (1.22)	$ (2.79)	$ (9.49)
Diluted	$ (0.80)	$ (0.62)	$ (0.55)	$ (0.83)	$ (0.65)	$ (6.69)	$ (0.93)	$ (1.22)	$ (2.79)	$ (9.49)

Segment Information - Additiona

Segment Information - Additional Information (Detail) - Segment	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Number of operating segments	2
Sales Revenue, Net | Customer Concentration Risk | Outside United States
Segment Reporting Information [Line Items]
Concentration risk percentage	19.00%	21.00%

Schedule of Financial Informati

Schedule of Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue from external customers	$ 49,570	$ 53,819	$ 57,989	$ 49,367	$ 60,341	$ 50,173	$ 43,572	$ 34,670	$ 210,745	$ 188,756
(Loss) income before income taxes									(74,541)	(255,143)
Total assets	474,366				540,598				474,366	540,598
Capital expenditures									2,039	2,598
Depreciation and amortization									34,605	44,282
Oilfield and Industrial Technologies and Services
Segment Reporting Information [Line Items]
Revenue from external customers									178,609	165,557
Operating Segment | Oilfield and Industrial Technologies and Services
Segment Reporting Information [Line Items]
Revenue from external customers									178,609	165,557
(Loss) income before income taxes									(77,264)	(255,097)
Total assets	456,416				524,952				456,416	524,952
Capital expenditures									1,093	2,371
Depreciation and amortization									33,452	43,005
Operating Segment | Environmental Technologies and Services
Segment Reporting Information [Line Items]
Revenue from external customers									32,136	23,199
(Loss) income before income taxes									2,723	(46)
Total assets	$ 17,950				$ 15,646				17,950	15,646
Capital expenditures									946	227
Depreciation and amortization									$ 1,153	$ 1,277

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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Revenues	$ 49,570	$ 53,819	$ 57,989	$ 49,367	$ 60,341	$ 50,173	$ 43,572	$ 34,670	$ 210,745	$ 188,756
Reportable Geographical Components [Member]
Long-lived assets:
Long-lived assets	278,813				333,147				278,813	333,147
Revenues:
Revenues									210,745	188,756
Reportable Geographical Components [Member] | UNITED STATES
Long-lived assets:
Long-lived assets	272,903				326,665				272,903	326,665
Revenues:
Revenues									171,167	149,041
Reportable Geographical Components [Member] | International
Long-lived assets:
Long-lived assets	$ 5,910				$ 6,482				5,910	6,482
Reportable Geographical Components [Member] | CANADA
Revenues:
Revenues									6,086	7,439
Reportable Geographical Components [Member] | Other International
Revenues:
Revenues									$ 33,492	$ 32,276

Schedule of Total Revenue from

Schedule of Total Revenue from Major Customers (Detail) - Operating Segment - Oilfield Technologies and Services - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Major Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.70%	16.10%
Major Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.70%	10.20%

Benefit Costs Recognized as Exp

Benefit Costs Recognized as Expense Under Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Benefit plan contributions
Benefit plan contributions	$ 1,142	$ 953
Savings Plan
Benefit plan contributions
Benefit plan contributions	$ 1,142	$ 953

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
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	10.00%

Commitments - Additional Inform

Commitments - Additional Information (Detail)	Nov. 01, 2008USD ($)	May 31, 2017	Dec. 31, 2018USD ($)T	Dec. 31, 2017USD ($)
Long-term Purchase Commitment [Line Items]
Net book value of property leased			$ 273,619,000	$ 324,186,000
Lease Agreements
Long-term Purchase Commitment [Line Items]
Net book value of property leased			104,179,000
Wet Sand | Agreement Began January 1, 2018
Long-term Purchase Commitment [Line Items]
Purchase commitment amount			$ 4,586,000
Purchase commitment, period			2 years
Minimum quantity to be purchased annually | T			720,000
Minimum quantity to be processed per month | T			10,000
Long-term purchase commitment, estimated shortfall amount per ton one			$ 2
Remaining quantity to be purchased | T			435,000
Long-term purchase commitment, agreement term			process at least 10,000 tons per month on a rolling three-month average.
Long-term purchase commitment, estimated shortfall amount per ton two			$ 7
Unrecovered capital infusion and other receivables			716,000
Net sand processing charges			2,369,000
Eufaula | kaolin | Supplier 2
Long-term Purchase Commitment [Line Items]
Additional purchase commitment, period		3 years
Purchase commitment amount			$ 1,141,000	2,207,000
Eufaula | Minimum | kaolin | Supplier 2
Long-term Purchase Commitment [Line Items]
Purchase obligation percentage of annual requirements			50.00%
McIntyre and Toomsboro | kaolin | Supplier 3
Long-term Purchase Commitment [Line Items]
Purchase obligation percentage of annual requirements			100.00%
Purchase commitment amount			$ 2,161,000	950,000
Marshfield, Wisconsin | Frac sand
Long-term Purchase Commitment [Line Items]
Purchase commitment amount			2,452,000	3,837,000
Future commitment amount			0
Marshfield, Wisconsin | Hydro sized sand
Long-term Purchase Commitment [Line Items]
Purchase commitment amount			1,077,000	$ 0
Future commitment amount			$ 0
Minimum quantity to be purchased annually | T			40,000
McIntyre | Wilkinson County Development Authority
Long-term Purchase Commitment [Line Items]
Agreement entry date	Nov. 1, 2008
Annual administrative fee	$ 50,000
Lease agreement period			through November 1, 2021

Employment Agreements - Additio

Employment Agreements - Additional Information (Detail) - President and Chief Executive Officer	12 Months Ended
	Dec. 31, 2018
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

Sale of Russian Proppant Busi_2

Sale of Russian Proppant Business - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 21, 2017	Jul. 31, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Reclassification of Russia cumulative translation loss to Net Loss upon sale					$ 33,347
Russian Proppant
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale of business				$ 350	26,747
Share Purchase Agreement | Russian Proppant
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net assets relating to Russian Proppant business	$ 17,754
Cash and cash equivalents relating to Russian Proppant business	846
Accounts receivable relating to Russian Proppant business	6,047
Total inventory relating to Russian Proppant business	8,573
Net PP&E relating to Russian Proppant business	2,763
Other net assets relating to Russian Proppant business	670
Accrued expenses relating to Russian Proppant business	1,145
Expenses incurred on sale of business	1,646
Gain on sale before consideration of cumulative translation adjustment	6,599
Reclassification of Russia cumulative translation loss to Net Loss upon sale	33,347
Loss on sale of business	26,747
Share Purchase Agreement | Russian Proppant
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale of business			$ 350
Additional proceeds on the sale related to net debt and net working capital purchase price adjustments					$ 4,000
Dispute settlement, expense			$ 3,650
Proceeds from settlement of receivable		$ 3,650
Share Purchase Agreement | Russian Proppant | Purchasers
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of business adjusted purchase price	$ 26,000

Sale of Millen Facility - Addit

Sale of Millen Facility - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net proceeds from asset sales	$ 27,526	$ 21,600
Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration receivable on sale of plant	23,000
Loss on sale of business	2,305	$ 0
Purchase and Sale Agreement | Ceramic Proppant Manufacturing Facility | Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration receivable on sale of plant	23,000
Selling expenses paid	899
Net proceeds from asset sales	22,101
Expected net cash proceeds as defined in the New Credit Agreement	15,733
Total assumed liabilities	$ 4,852
Debt instrument, interest rate	5.00%
Debt instrument, periodic payment including principal and interest	$ 35
Debt instrument, maturity date	Feb. 29, 2024
Letter of credit	$ 2,000
Letters of credit reduction amount per year	400
Write-off of certain spare parts	196
Book value of the assets held for sale	17,842
Loss on sale of business	2,305
Post-Closing Matters and Assumed Liabilities | Purchase and Sale Agreement | Ceramic Proppant Manufacturing Facility | Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Selling expenses	7,267
Paid at Closing | Purchase and Sale Agreement | Ceramic Proppant Manufacturing Facility | Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash held in escrow	3,000
Post-Closing Matters | Purchase and Sale Agreement | Ceramic Proppant Manufacturing Facility | Millen, Georgia Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash held in escrow	$ 1,200

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event $ in Thousands	1 Months Ended
	Jan. 31, 2019USD ($)shares
Restricted Stock
Subsequent Event [Line Items]
Units granted | shares	468,984
Fair value of the stock award on the date of grant | $	$ 2,298
Vesting period	3 years
Phantom Share Units (PSUs)
Subsequent Event [Line Items]
Units granted | shares	105,276
Fair value of the stock award on the date of grant | $	$ 516
Vesting period	3 years