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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

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