Quarterly report pursuant to Section 13 or 15(d)

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

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Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Vechicle
Hurricane Ida            
Long Term Contracts Or Programs Disclosure [Line Items]            
Date of landfall     Aug. 29, 2021      
Impact of Hurricane Ida, description     On August 29, 2021, Hurricane Ida made landfall near Houma, Louisiana as a high-end Category 4 hurricane, with high winds, heavy rains and storm surge causing significant damage and power outages throughout the region, including our Houma Facilities and operations. Our Houma Facilities did not experience significant flood damage; however, the high winds and heavy rain damaged multiple buildings and equipment and resulted in significant debris throughout the facility.      
Insurance payments received $ 7.0       $ 1.0  
Charges associated with insurance recoveries of storm         3.2  
Gain on insurance recovery 3.4   $ 3.1      
Insurance receivables 1.2   1.2      
Hurricane Ida | Minimum            
Long Term Contracts Or Programs Disclosure [Line Items]            
Future repair costs associated with insurance payments received for buildings     1.0      
Hurricane Ida | Maximum            
Long Term Contracts Or Programs Disclosure [Line Items]            
Future repair costs associated with insurance payments received for buildings     3.0      
Second Forty-Vehicle Ferry            
Long Term Contracts Or Programs Disclosure [Line Items]            
Deductible associated with insurance coverage for incident     0.1      
Current estimate of costs to repair damage     0.3      
Second Forty-Vehicle Ferry | Hurricane Ida            
Long Term Contracts Or Programs Disclosure [Line Items]            
Total charges related to deductibles 0.2   0.2      
Charges related to deductibles with insurance coverages     0.5      
Forty-Vehicle Ferry            
Long Term Contracts Or Programs Disclosure [Line Items]            
Number of vehicle ferry projects with rework and construction challenges. | Vechicle           2
Reserve for loss $ 1.7   $ 1.7      
Forty-Vehicle Ferry Vessel Two            
Long Term Contracts Or Programs Disclosure [Line Items]            
Projects, percent complete (percentage) 95.00%   95.00%      
Forty-Vehicle Ferry Vessel One            
Long Term Contracts Or Programs Disclosure [Line Items]            
Projects, percent complete (percentage) 82.00%   82.00%      
Offshore Modules, Material Supply and Subsea Structures Projects            
Long Term Contracts Or Programs Disclosure [Line Items]            
Change in estimated margins   $ 1.9   $ 2.0    
Seventy-Vehicle Ferry            
Long Term Contracts Or Programs Disclosure [Line Items]            
Projects, percent complete (percentage) 92.00%   92.00%      
Reserve for loss $ 0.4   $ 0.4      
Change in estimated margins   0.9   1.7    
Shipyard            
Long Term Contracts Or Programs Disclosure [Line Items]            
Reduction of estimated contract price for liquidated damages, amount $ 1.3   $ 1.3   $ 1.2  
Change in estimated margins   0.9   1.7    
Fabrication            
Long Term Contracts Or Programs Disclosure [Line Items]            
Change in estimated margins   $ 1.9   $ 2.0