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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) $ (8,892) $ (36,379) $ 2,129 $ (6,164) $ (1,569) $ (11,798) $ 12,616 $ 20,799 $ (49,306) $ 20,048 $ 65,465
Income (loss) from continuing operations (25,190) (39,490) (7,688) (15,765) (11,088) (36,421) (2,874) 4,237 $ (88,133) $ (46,146) $ 5,087
Impairment of Long Lived Assets and Goodwill [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Income (loss) from continuing operations 1,621       3,518 39,670          
Fees and Expenses Relating to Certain Activist Shareholders' Proposals [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Income (loss) from continuing operations         155 113 2,655 1,679      
Interest Expense [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Income (loss) from continuing operations 9,816 13,333 6,446 1,350 873 872 2,229 3,397      
Severance Agreements with Certain Former Executives [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Income (loss) from continuing operations         224 1,789          
Depreciation Expense [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) (17,874) (16,862) (14,028) (10,590) (9,447) (9,772) (8,877) (7,834)      
Income (loss) from continuing operations (17,874) (16,862) (14,028) (10,590) (9,447) (9,772) (8,877) (7,834)      
Undesignated Commodities Contracts [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) 59 18 87 (24) (718) (1,014) 185 (1,829)      
Income (loss) from continuing operations 59 18 87 (24) (718) (1,014) $ 185 (1,829)      
Turnaround Costs [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss) (38) (8,597) (535) (95) (55) (2,101)   (152)      
Income (loss) from continuing operations $ (38) $ (8,597) $ (535) (95) $ (55) $ (2,101)   $ (152)      
Consulting Fee - Property Tax Services [Member]                      
Schedule Of Quarterly Financial Data [Line Items]                      
Gross profit (loss)       (12,095)              
Income (loss) from continuing operations       $ (12,095)