Supplemental Financial Information - Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other Assets, Noncurrent Disclosure [Abstract]
Noncurrent restricted cash	$ 15,616	$ 15,644
Deferred certification costs	3,976	5,199
Noncurrent deferred contract costs	5,021	6,832
Deferred income taxes	1,473	1,776
Other noncurrent assets	6,463	2,392
Total other assets	$ 32,549	$ 31,843