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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail)			1 Months Ended			6 Months Ended
	Oct. 30, 2020 USD ($) $ / shares shares	Sep. 25, 2019 USD ($)	Apr. 30, 2022	Dec. 31, 2021 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 09, 2020 $ / shares
Debt Instrument [Line Items]
Property and equipment-gross						$ 1,517,533,000	$ 1,621,437,000
Long-Term Debt						$ 633,128,000	$ 651,410,000
Warrants of common stock exercise price | $ / shares									$ 3.98
Treasury Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Calculated collateral coverage ratio	1.6
Treasury Loan [Member] | Maximum [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Minimum collateral coverage ratio covenant			1.5
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				$ 30,800,000
Long term debt interest rate description						LIBOR plus 4.25%
Secured term loan facility, maximum borrowing capacity				$ 54,000,000.0
Debt instrument, maturity date				Dec. 31, 2027
Spare Engine Facility [Member] | LIBOR [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate				4.25%
Equipment Notes [Member]
Debt Instrument [Line Items]
Long-Term Debt						$ 141,700,000
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 35,000,000.0			$ 35,000,000.0
Term loan, term		3 years			3 years
Debt instrument, expiration year and month		2022-09			2022-09
Long term debt interest rate description						one-month LIBOR plus 3.75%
Outstanding working capital draw loan						$ 15,600,000
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate		3.75%			3.75%
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						$ 1,029,700,000

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