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Impairments and (Gain) Loss on Assets Held for Sale - Summary of Impairments and (Gain) Loss on Assets Held for Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of AHFS | $ 8,166 | $ 2,351 | $ 989
Impairments of assets removed from AHFS | 1,060 |  |
Impairments of assets | 17,223 | 4,445 | 7,672
(Gain) loss on AHFS and other | 305 |  |
Gain from insurance proceeds |  | (3,571) |
Other |  |  | 259
Total | 17,528 | (6,850) | 7,931
South Texas Properties |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Gain on sale of South Texas Properties, net |  | (7,724) |
Fabrication |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Gain on sale of South Texas Properties, net |  | 8,000 |
Impairments of AHFS | 7,842 | 1,387 |
Impairments of assets removed from AHFS | 1,060 |  |
Impairments of assets | 8,700 |  | 6,700
(Gain) loss on AHFS and other | (369) |  |
Gain from insurance proceeds |  | (3,571) |
Total | 8,651 | (7,896) | 6,683
Fabrication | South Texas Properties |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Gain on sale of South Texas Properties, net |  | (7,724) |
Shipyard |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of AHFS | 324 | 964 | 989
Impairments of assets | 7,900 | 1,000 | 1,200
(Gain) loss on AHFS and other | 20 |  |
Other |  |  | 259
Total | 7,920 | 964 | 1,248
Services |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Total | 282 | 82 |
Corporate |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
(Gain) loss on AHFS and other | 654 |  |
Total | 675 |  |
Jennings Yard assets |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 4,578 |  |
Jennings Yard assets | Shipyard |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 4,578 |  |
Lake Charles Yard assets |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 2,998 |  |
Lake Charles Yard assets | Shipyard |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 2,998 |  |
Inventory and Other Assets |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 421 | 2,094 | 6,683
Inventory and Other Assets | Fabrication |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 118 | 2,012 | $ 6,683
Inventory and Other Assets | Services |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | 282 | $ 82 |
Inventory and Other Assets | Corporate |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets | $ 21 |  |

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