Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
	Jan. 17, 2020	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Cash payments for interest		$ 0	$ 5
Cash payments for income taxes		0	29
Cash payments included in the measurement of lease liabilities related to operating leases		$ 1,837	$ 4,167
CRJ-200 [Member] | Southshore [Member]
Business Acquisition [Line Items]
Liabilities assumed in a business acquisition	$ 3,466
Fair value of assets acquired in a non cash transaction	$ 16,666
Series C Redeemable Convertible Preferred Stock [Member] | CRJ-200 [Member] | Southshore [Member]
Business Acquisition [Line Items]
Non cash transaction in a business combination shares issued	13,200