Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Current:
Federal	$ 9,774	$ 8,023	$ 17,090	$ 13,017
State and local	1,720	1,587	3,198	2,773
Foreign	1,434	561	1,955	294
Total current provision	12,928	10,171	22,243	16,084
Deferred:
Federal	64	1,002	3,904	4,333
State and local	6	74	630	585
Foreign	(177)	(367)	(47)	111
Total deferred provision	(107)	709	4,487	5,029
Provision for income taxes	$ 12,821	$ 10,880	$ 26,730	$ 21,113