Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Current:
Federal	$ 9,948	$ 8,792	$ 16,472	$ 16,762
State and local	1,957	2,077	3,350	3,997
Foreign	3,273	2,415	6,044	3,529
Total current provision	15,178	13,284	25,866	24,288
Deferred:
Federal	(176)	(505)	1,426	341
State and local	(31)	(101)	218	29
Foreign	(167)	45	(8)	1,138
Total deferred provision	(374)	(561)	1,636	1,508
Provision for income taxes	$ 14,804	$ 12,723	$ 27,502	$ 25,796