Leases (Additional Information) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 40,960	$ 41,142
Operating lease liabilities	$ 42,323	$ 42,042
Weighted-average remaining lease term	8 years 9 months 18 days
Weighted-average discount rate	3.14%