Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 36,587	$ 42,975
Accumulated depreciation	122,630	118,749
Depreciation and amortization	8,700	11,400	$ 11,700
Aircraft And Aircraft-Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, net	27,500	30,000
Accumulated depreciation	$ 21,100	$ 18,600