Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities and Debt - Additional Information (Details)

v3.22.2
Credit Facilities and Debt - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 28, 2021
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Apr. 17, 2020
Line Of Credit Facility [Line Items]          
Surety bonds   $ 110,800,000   $ 110,800,000  
Surety bonds subject to dispute   50,000,000.0   50,000,000.0  
Surety bonds relates to Active Retained Shipyard Contracts   $ 55,800,000   $ 55,800,000  
Maturity date       Jun. 30, 2023  
Short-term Premium Finance Arrangement          
Line Of Credit Facility [Line Items]          
Stated interest rate (percentage)   4.30%   4.30%  
Short-term premium finance   $ 2,400,000   $ 2,400,000  
short-term premium finance , Number of installment   payable in ten equal monthly installments      
Principal repayments   $ 200,000   200,000  
Remaining principal balance   2,200,000   2,200,000  
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   $ 1,700,000  
Letter of Credit          
Line Of Credit Facility [Line Items]          
Stated interest rate (percentage)   1.50%   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