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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ (1,569) | $ (11,798) | $ 12,616 | $ 20,799 | $ 9,250 | $ (912) | $ 28,950 | $ 28,177 | $ 20,048 | $ 65,465 | $ 46,836
Income (loss) from continuing operations | (11,088) | (36,421) | (2,874) | 4,237 | (2,717) | (9,157) | 8,110 | 8,851 | $ (46,146) | $ 5,087 | $ 35,600
Impairment of Long Lived Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 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 | 151 | 230 | 262 | 4,200 |  |  |
Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 873 | 872 | 2,229 | 3,397 | 4,141 | 5,079 | 5,671 | 6,708 |  |  |
Severance Agreements with Certain Former Executives [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 224 | 1,789 |  |  |  |  |  |  |  |  |
Property Insurance Recoveries [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  | 5,147 |  |  |
Undesignated Commodities Contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | (718) | (1,014) | 185 | (1,829) | (2,844) | (214) | (105) | 2,216 |  |  |
Income (loss) from continuing operations | (718) | (1,014) | $ 185 | (1,829) | (2,844) | (214) | (105) | 2,216 |  |  |
Turnaround Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | (55) | (2,101) |  | (152) | (105) | (5,215) | (840) | (330) |  |  |
Income (loss) from continuing operations | $ (55) | $ (2,101) |  | $ (152) | $ (105) | $ (5,215) | $ (840) | (330) |  |  |
Business Interruption Insurance Recoveries [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  | 22,836 |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  | $ 22,836 |  |  |

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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