Revenue - Summary of Changes in Deferred Revenue Related to Material Right Performance Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Balance, beginning of period	$ 88,993	$ 78,455	$ 86,826	$ 76,244
Deferral of revenue	8,536	6,601	15,498	12,486
Recognition of unearned revenue	(5,071)	(4,169)	(9,866)	(7,843)
Balance, end of period	$ 92,458	$ 80,887	$ 92,458	$ 80,887