Leases - Summary of Components of Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease expense	$ 26,360	$ 24,670
Variable lease expense	4,518	4,647
Short-term lease expense	625	583
Sublease income	(2,066)	(1,710)
Total net lease expense	$ 29,437	$ 28,190	$ 19,000