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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) $ 78,464 $ 17,447 $ 35,008 $ 8,060 $ (3,465) $ (1,059) $ 19,021 $ 2,551 $ 138,979 $ 17,048 $ 4,985
Gain (loss) on natural gas forward contracts       2,706 (1,443) 513 31 (714) 2,706 (1,613)  
Recovery from a settlement with a vendor             5,664        
Legal fees associated with Leidos matter (296) (271) (441) (886) (572) (901) (955) (3,287)      
Gain (loss) on extinguishment of debt (20,259)   10,000           (10,259)    
Interest expense associated with Global judgment (80) (80) (79) (78) (80) (80) (79) (1,327) (49,378) (51,115) (46,389)
Unrealized gain (loss) on fair value of embedded derivative   (1,106) (716) (436) (561) (141) 120 637      
Benefit (provision) for income taxes 4,369 (19) 248 (42) 1,741 1,370 1,299 $ 339 $ 4,556 $ 4,749 $ 20,924
Cost of Sales [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Compensation expense due to CoC event   (1,221)                  
SG&A [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Compensation expense due to CoC event   (3,786)                  
Turnaround Expense                      
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) $ (1,130) $ (7,976) $ (707) $ (140) $ (31) $ (34) $ (11)