Annual report pursuant to Section 13 and 15(d)

Shipyard Transaction and Discontinued Operations - Additional Information (Details)

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Shipyard Transaction and Discontinued Operations - Additional Information (Details)
 12 Months Ended
Apr. 19, 2021
USD ($)
Vechicle
vessel
Ship_project
drydock
Dec. 31, 2021
USD ($)
Vechicle
Dec. 31, 2020
USD ($)
Vechicle
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Liabilities   $ 31,365,000 $ 112,262,000 $ 31,701,000 $ 45,395,000 $ 112,669,000
Asset impairments   22,750,000 $ 3,310,000      
Material liabilities of discontinued operations   $ 0        
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 2      
Shipyard Transaction            
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          
Pre tax loss on estimated carry value of net assets sold   $ 25,300,000        
Estimated loss related to impairment of long lived assets and transaction costs   22,800,000 $ 1,600,000      
Additional loss related to additional transaction and other costs   2,600,000        
Asset impairments   22,800,000        
Material assets of discontinued operations   0        
Shipyard Transaction | Retained Shipyard Contracts And Other Shipyard Division Liabilities            
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Liabilities   8,700,000        
Shipyard Transaction | 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 Transaction            
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   27,700,000        
Deferred transaction price   900,000        
Estimate change in working capital for divested shipyard contracts   $ 7,800,000