Quarterly report pursuant to Section 13 or 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)

v3.21.2
Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Vechicle
Jun. 30, 2020
USD ($)
Vechicle
Dec. 31, 2020
USD ($)
Long Term Contracts Or Programs Disclosure [Line Items]          
Number of vehicle ferry projects | Vechicle     2    
Reduction of estimated contract price for liquidated damages, amount $ 900,000   $ 900,000   $ 600,000
Shipyard          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins 900,000   1,700,000 $ 1,200,000  
F&S          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins 1,900,000 $ 1,000,000.0 2,000,000.0 1,900,000  
Offshore Modules Project, Material Supply Project and Subsea Structures Project          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins 1,900,000   2,000,000.0    
Seventy-Vehicle Ferry          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins $ 900,000   $ 1,700,000    
Projects, percent complete (percentage) 73.00%   73.00%    
Reserve for loss $ 800,000   $ 800,000    
Paddlewheel Riverboat and Subsea Components Projects          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins   500,000   1,400,000  
Jacket and Deck          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins   500,000   $ 500,000  
Forty-Vehicle Ferry          
Long Term Contracts Or Programs Disclosure [Line Items]          
Number of vehicle ferry projects | Vechicle       2  
Change in estimated margins   $ 0   $ 1,200,000