Quarterly report pursuant to Section 13 or 15(d)

Shipyard Transaction and Discontinued Operations - Additional Information (Details)

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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