Summary of Significant Accounting Policies - Summary of Original Cost of Company's Fixed Assets and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Original Cost	$ 269,788	$ 264,399
Accumulated Depreciation/ Amortization	169,766	143,313
Aircraft [Member]
Property, Plant and Equipment [Line Items]
Original Cost	70,089	70,178
Accumulated Depreciation/ Amortization	40,544	31,319
Engines [Member]
Property, Plant and Equipment [Line Items]
Original Cost	163,708	157,510
Accumulated Depreciation/ Amortization	103,834	86,339
Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Original Cost	27,936	28,459
Accumulated Depreciation/ Amortization	18,655	18,834
Ground Equipment [Member]
Property, Plant and Equipment [Line Items]
Original Cost	2,718	2,555
Accumulated Depreciation/ Amortization	2,063	1,868
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Original Cost	4,519	4,509
Accumulated Depreciation/ Amortization	4,218	4,130
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Original Cost	818	1,188
Accumulated Depreciation/ Amortization	$ 452	$ 823