Leases - Summary of Information Related to ROU Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019
Assets And Liabilities Lessee [Abstract]
Cash paid for operating lease liabilities		$ 1,731
Right-of-use assets obtained in exchange for new operating lease obligations	$ 25,800	$ 26,695
Weighted-average remaining lease term		4 years 3 months 18 days
Weighted-average discount rate		4.40%