Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Current:
Federal	$ 13,273	$ 11,041	$ 30,898	$ 28,131
State and local	1,895	2,036	5,055	5,234
Foreign	1,714	1,234	4,599	3,189
Total current provision	16,882	14,311	40,552	36,554
Deferred:
Federal	(918)	(1,246)	6,895	2,658
State and local	(154)	(209)	964	420
Foreign	(374)	(218)	(143)	(264)
Total deferred provision	(1,446)	(1,673)	7,716	2,814
Provision for income taxes	$ 15,436	$ 12,638	$ 48,268	$ 39,368