Annual report pursuant to Section 13 and 15(d)

Credit Facilities - Additional Information (Details)

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Credit Facilities - Additional Information (Details) - USD ($)
12 Months Ended
Jul. 28, 2021
Dec. 31, 2021
Apr. 17, 2020
Line Of Credit Facility [Line Items]      
Maturity date   Jun. 30, 2023  
Gain on extinguishment of debt   $ 9,061,000  
Surety bonds   110,800,000  
Surety bonds subject to dispute   50,000,000.0  
Surety bonds relates to Active Retained Shipyard Contracts   55,800,000  
Maximum      
Line Of Credit Facility [Line Items]      
Letter of credit facility   $ 20,000,000.0  
LC Facility      
Line Of Credit Facility [Line Items]      
Fees on undrawn borrowings (percentage)   0.40%  
Total outstanding letters of credit   $ 1,700,000  
Letter of Credit      
Line Of Credit Facility [Line Items]      
Stated interest rate (percentage)   1.50%  
PPP Loan      
Line Of Credit Facility [Line Items]      
Unsecured loan amount     $ 10,000,000.0
Loan payments $ 9,100,000    
Gain on extinguishment of debt   $ 9,100,000  
PPP Loan threshold requiring an audit by the SBA     $ 2,000,000.0