Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020	Nov. 04, 2022	Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items]
Depreciation expense		$ 6,224	$ 6,274	$ 18,656	$ 18,769
Deferred Revenue, Noncurrent		22,290		22,290
Long-term note receivable		$ 60,315		$ 60,315
Notes Receivable Instrument, Interest Rate		4.50%		4.50%
Notes Receivable Instrument, Maturity Date				Feb. 28, 2023
Interest receivable		$ 3,954		$ 3,954
Deferred revenue recognized		1,385		4,925
Revenue, Performance Obligation		5,138	728	12,746	13,699
Cash Settlement						$ 670
Note Receivable		11,048		11,048		11,048
Payments for proceeds from incentives and penalties		2,137	339	5,443	2,820
Cash Received From United For The Opening Of A Crew Base	$ 294
Restricted Cash		418		418				$ 1,449
Marketable securities		130,517		130,517				138,370
Revenue from contract with customers amount of consideration receivable due for settlement		18,693		18,693
Operating Expenses		55,910	38,664	164,994	81,437
Undisputed notes receivables							$ 50,126
Deferred income current		22,318		22,318				35,792
Notes Receivable [Member]
Summary of Significant Accounting Policies [Line Items]
Interest receivable		174		174
Revenue from contract with customers amount of consideration receivable due for settlement		14,175		14,175
October 2020 Amendment [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred recognizing revenue	$ 73
Deferred revenue current		2,406		2,406
Deferred Revenue, Noncurrent		1,170		1,170
Deferred Cash Settlement due from United						$ 4,410
Deferred Revenue Recognition		453	512	1,611	1,150
Air Wisconsin [Member]
Summary of Significant Accounting Policies [Line Items]
Accounts receivable, net		22,302		22,302
Upfront fee		932	1,082	3,314	2,428
Fulfillment costs		100	116	355	260
Deferred Revenue Recognition		$ 5,180	5,298	$ 22,548	10,054
Revision of Prior Period, Reclassification, Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Operating Expenses			$ 3,185		8,265
Deferred income current								$ 35,792
Reclassification from contract liabilities to deferred revenue					$ 27,961