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Impairments and (Gain) Loss on Assets Held for Sale - Summary of Assets Held for Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Long Lived Assets Held-for-sale [Line Items] |  |
Machinery and equipment | $ 16,399 | $ 16,399
Accumulated depreciation | (8,185) | (8,185)
Total | 8,214 | 8,214
Shipyard |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Machinery and equipment | 3,619 | 3,619
Accumulated depreciation | (1,605) | (1,605)
Total | 2,014 | 2,014
F&S |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Machinery and equipment | 12,780 | 12,780
Accumulated depreciation | (6,580) | (6,580)
Total | $ 6,200 | $ 6,200

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