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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 - Shipyard - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Long Lived Assets Held-for-sale [Line Items] |  |
Machinery and equipment | $ 4,587 | $ 11,877
Accumulated depreciation | (2,787) | (5,677)
Total | $ 1,800 | $ 6,200

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