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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 25, 2018 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery from a settlement with a vendor |  |  |  | $ 5,664 |  |  |  |  |  |  |  |
Gross profit (loss) |  | $ (3,465) | $ (1,059) | 19,021 | $ 2,551 | $ (12,277) | $ (9,733) | $ 19,677 | $ 7,318 | $ 17,048 | $ 4,985 | $ 15,835
Unrealized gain (loss) on natural gas contracts |  | (1,743) | 669 | 396 | (527) |  |  |  |  |  |  |
Net income (loss) |  | (21,692) | (20,402) | (365) | (19,452) | (27,714) | (30,794) | 6,631 | (11,540) | (61,911) | (63,417) | (72,226)
Charge associated with assets held for sale |  |  |  |  |  | (9,701) |  |  |  |  |  |
Legal fees associated with Leidos matter |  | (572) | (901) | (955) | (3,287) | (3,843) | (3,330) | (1,496) | (932) |  |  |
Interest expense associated with Global judgment | $ (900) | (80) | (80) | (79) | (1,327) |  |  |  |  | (51,115) | (46,389) | (43,064)
Benefit (provision) for income taxes |  | 1,741 | 1,370 | 1,299 | $ 339 | 15,108 | 483 | 5,733 | $ (400) | $ 4,749 | $ 20,924 | $ (1,740)
Turnaround Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | $ (31) | $ (34) | $ (11) |  | $ (5,374) | $ (7,232) | $ (604) |  |  |  |

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