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Shipyard Transaction and Discontinued Operations - Additional Information (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 19, 2021 USD ($) Vechicle vessel Ship_project drydock | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  | $ 22,750,000 |
Liabilities |  | $ 32,652,000 | $ 31,365,000 |  |  | $ 32,652,000 |  | $ 31,365,000
Shipyard Transactions |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of research vessels projects | vessel | 3 |  |  |  |  |  |  |
Number of divested shipyard contracts | Ship_project | 5 |  |  |  |  |  |  |
Number of drydocks | drydock | 4 |  |  |  |  |  |  |
Number of drydocks previously supported for shipyard division operations | drydock | 3 |  |  |  |  |  |  |
Number of MPSV projects | vessel | 2 |  |  |  |  |  |  |
Asset impairments |  |  |  |  | $ 22,800,000 |  | 22,800,000 |
Transaction and other costs |  |  |  | $ 1,900,000 |  |  | $ 2,600,000 |
Material operating results of discontinued operations |  | 0 |  |  |  | 0 |  |
Material assets of discontinued operations |  | 0 | 0 |  |  | 0 |  | 0
Material liabilities of discontinued operations |  | 0 | 0 |  |  | 0 |  | 0
Shipyard Transactions | Retained Shipyard Contracts And Other Shipyard Division Liabilities |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Liabilities |  | 2,900,000 | 8,700,000 |  |  | $ 2,900,000 |  | 8,700,000
Shipyard Transactions | Forty-Vehicle Ferry |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of vehicle ferry projects | Vechicle | 2 |  |  |  |  |  |  |
Bollinger | Shipyard Transactions |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Transaction price | $ 28,600,000 |  |  |  |  |  |  |
Net of estimated transaction and other costs | $ 26,100,000 |  |  |  |  |  |  |
Transaction price on closing date |  | $ 900,000 | $ 1,300,000 | 26,400,000 |  |  |  | $ 27,700,000
Estimate change in working capital for divested shipyard contracts |  |  |  | $ 7,800,000 |  |  |  |

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