Leases - Lessee, Operating Lease Other Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ (5,668)	$ (4,977)	$ (11,401)	$ (9,309)
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 642	$ 9,272	$ 20,243	$ 23,107
Weighted-average remaining lease term of operating leases	7 years 8 months 12 days	7 years 9 months 18 days	7 years 8 months 12 days	7 years 9 months 18 days
Weighted-average discount rate of operating leases	3.30%	3.30%	3.30%	3.30%