Leases - Summary of Additional Lease Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 9,056	$ 9,111
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 16,117	$ 17,770
Weighted-average remaining lease term - operating leases (years)	6 years 7 months 6 days	6 years 7 months 6 days
Weighted-average discount rate - operating leases	4.60%	5.10%