Leases - Summary of Components of Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 16,188	$ 15,005
Short-term lease cost	330	498
Variable lease cost	1,871	5,318
Sublease income	(256)	(205)
Total lease cost	$ 18,133	$ 20,616