Assets Held for Sale - Additional Information (Detail) $ in Thousands		3 Months Ended
	Jan. 31, 2023 USD ($) AirCraft	Mar. 31, 2023 AirCraft	Dec. 31, 2022 USD ($) AirCraft	Sep. 30, 2022 USD ($)
Long Lived Assets Held For Sale [Line Items]
Assets held for sale | $			$ 73,000	$ 73,000
Proceeds from sale of property | $			$ 8,200
CRJ-900 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			11
CRJ-900 [Member] | Forecast [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold		11
CRJ 700 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			8
CRJ 700 [Member] | Subsequent Event [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold	8
Proceeds from sale of property | $	$ 8,000
CRJ-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			1
CRJ-200 Aircraft [Member] | Forecast [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold		1
C R J-900 C R J-700 C R J-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale | $			$ 73,000