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Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Vechicle | Dec. 31, 2019 USD ($) Vechicle | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | $ 3,310 | $ 17,223 | $ 4,445
Gain on sale of South Texas Properties, net |  |  |  |  | 7,700
Gain on insurance recoveries |  |  |  |  | 3,571
Contract assets | $ 67,521 | $ 52,128 | 67,521 | 52,128 |
Contract receivables | 15,129 | 26,271 | $ 15,129 | 26,271 |
Forty-Vehicle Ferry |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Increase in operating income (loss) due to project charges |  |  |  | 5,100 |
Revenue reclassified between the Shipyard and Fabrication & Services segments |  |  |  | $ 9,200 |
Number of vehicle ferry projects | Vechicle |  |  | 2 | 2 |
Contract assets |  | 6,000 |  | $ 6,000 |
Contract receivables |  | 6,000 |  | 6,000 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 700 |
Shipyard |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Increase in operating income (loss) due to project charges | $ 8,800 | 10,200 | $ 16,600 | 12,300 | 6,700
Asset impairments |  |  | 1,600 | 7,900 | 1,000
Charges associated with damage caused by Hurricane Laura |  |  | 1,300 |  |
F&S |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Increase in operating income (loss) due to project charges |  | $ 3,800 | 2,700 | 4,900 | 2,400
Asset impairments |  |  | 2,500 | $ 8,900 | 7,800
Gain on settlement of contract dispute |  |  | $ 10,000 |  |
Shipyard, Fabrication and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  |  |  | $ 3,500

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