Annual report pursuant to Section 13 and 15(d)

Shipyard Transaction and Discontinued Operations - Additional Information (Details)

v3.23.1
Shipyard Transaction and Discontinued Operations - Additional Information (Details)
 12 Months Ended
Apr. 19, 2021
USD ($)
Drydock
Vechicle
Vessel
Ship_project
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Vechicle
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Liabilities   $ 32,242,000 $ 31,365,000
Asset impairments   484,000 $ 22,750,000
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
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    
Asset impairments     $ 22,800,000
Transaction and other costs     2,600,000
Material operating results of discontinued operations   0  
Material assets of discontinued operations   0 0
Material liabilities of discontinued operations   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   2,700,000 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 27,700,000
Estimate change in working capital for divested shipyard contracts     $ 7,800,000