Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Current:
Federal	$ 9,280	$ 6,742	$ 22,297	$ 20,004
State and local	1,583	1,823	4,356	4,717
Foreign	227	312	520	602
Total current provision	11,090	8,877	27,173	25,323
Deferred:
Federal	(354)	(380)	3,979	3,885
State and local	(73)	(79)	512	699
Foreign	101	(289)	213	(519)
Total deferred provision	(326)	(748)	4,704	4,065
Provision for income taxes	$ 10,764	$ 8,129	$ 31,877	$ 29,388