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v3.23.1

Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 27, 2022 USD ($) | Oct. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2022 | Dec. 31, 2021 USD ($) | Dec. 31, 2022 | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2020 USD ($) | Apr. 09, 2020 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment-gross |  |  |  |  |  | $ 1,277,917,000 | $ 1,270,563,000 |  |
Long-Term Debt |  |  |  |  |  | 608,692,000 | $ 599,735,000 |  |
Revolving loan |  |  |  |  |  | 25,500,000 |  |  |
Warrants of common stock exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 3.98
Treasury Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Calculated collateral coverage ratio |  | 1.6 |  |  |  |  |  |  |
Minimum collateral coverage ratio covenant |  |  | 1.55 |  |  |  |  |  |
Treasury Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional collateral coverage ratio |  | 1.6 |  |  |  |  |  |  |
Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock | shares |  | 4,899,497 |  |  |  |  |  |  |
Warrants of common stock exercise price | $ / shares |  | $ 3.98 |  |  |  |  |  |  |
Spare Engine Facility [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 35,300,000 |  |  |  |  |
Secured term loan facility, maximum borrowing capacity |  |  |  | $ 54,000,000.0 |  |  |  |  |
Debt instrument, maturity date |  |  |  | Dec. 31, 2027 |  |  |  |  |
Long term debt, fixed interest rate |  |  | 7.50% |  | 7.50% |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate | 3.50% |  |  |  |  |  |  |  |
Revolving loan | $ 10,500,000 |  |  |  |  |  |  |  |
Covenant capping restricted payments | 5,000,000.0 |  |  |  |  |  |  |  |
Revolving commitments | $ 30,700,000 |  |  |  |  |  |  |  |
Rental coverage ratio | 1.00 |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount required |  |  |  |  |  | 15,000,000.0 |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | SOFR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate | 4.50% |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | United [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount funded by company |  |  |  |  |  | 25,500,000 |  |  |
Equipment Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 120,100,000 |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Secured term loan facility, maximum borrowing capacity |  | $ 200,000,000.0 |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Oct. 30, 2025 |  |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  | 3.50% |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  |  |  |  |  |  | $ 195,000,000.0 |
Secured term loan facility, additional amount borrowed |  |  |  |  |  | 0 |  |  |
Debt instrument, maturity date |  | Oct. 30, 2025 |  |  |  |  |  |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment-gross |  |  |  |  |  | $ 792,400,000 |  |  |

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