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Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |
Impairments and (gain) loss on assets held for sale |  |  |  | $ 17,528 | $ (6,850) | $ 7,931
Proceeds collection of receivables |  |  | $ 2,800 |  |  |
Gain on sale |  | $ 4,100 |  | 584 | (268) | 35
Impairment charges related to inventory and assets |  | 3,000 |  |  |  |
Fabrication and Shipyard |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |
Increase in operating loss due to project charges | $ 13,800 |  |  |  |  |
Fabrication, Shipyard and Services |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |
Impairments and (gain) loss on assets held for sale | $ 17,300 |  |  |  |  |
Shipyard |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |
Increase in operating loss due to project charges |  | $ 5,800 |  | 7,200 | 6,700 | 34,500
Impairments and (gain) loss on assets held for sale |  |  |  | $ 7,920 | $ 964 | $ 1,248

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