Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Current:
Federal	$ 9,628	$ 6,358	$ 26,100	$ 23,119
State and local	1,865	1,619	5,215	5,616
Foreign	3,385	2,502	9,429	6,036
Total current provision	14,878	10,479	40,744	34,771
Deferred:
Federal	(1,231)	(663)	195	(321)
State and local	(214)	(136)	4	(107)
Foreign	(97)	(477)	(105)	656
Total deferred provision	(1,542)	(1,276)	94	228
Provision for income taxes	$ 13,336	$ 9,203	$ 40,838	$ 34,999