Leases - Summary of Other Information Related to Operating Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 21,130	$ 24,006
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 37,987	$ 33,782
Weighted-average remaining lease term - operating leases	69 months	59 months
Weighted-average discount rate - operating leases	3.62%	4.32%