Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items]
Depreciation expense		$ 6,315	$ 6,249
Deferred Revenue, Noncurrent		40,102			$ 35,792
Long-term note receivable		$ 51,078
Notes Receivable Instrument, Interest Rate		4.50%
Notes Receivable Instrument, Maturity Date		Feb. 28, 2023
Interest Receivable		$ 2,710
Deferred revenue recognized		6,321
Revenue, Performance Obligation		3,509	7,235
Cash Settlement				$ 670
Note Receivable				11,048
Payments for proceeds from incentives and penalties		777	1,819
Cash Received From United For The Opening Of A Crew Base	$ 294
Restricted Cash		576
Marketable securities		136,178			$ 138,370
October 2020 Amendment [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred recognizing revenue	$ 73
Deferred revenue current		4,654
Deferred Revenue, Noncurrent		2,263
Deferred Cash Settlement due from United				$ 4,410
Deferred Revenue Recognition		519	313
Air Wisconsin [Member]
Summary of Significant Accounting Policies [Line Items]
Accounts receivable, net		5,066
Upfront fee		1,066	661
Fulfillment costs		114	71
Deferred Revenue Recognition		$ 4,736	$ 7,911