Income Taxes - Schedule of Provision for Taxes on Income and Other Related Income Before Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal
Current									$ 3,362	$ 9,744	$ 23,744
Deferred									4,338	(285)	(525)
State
Current									782	1,223	1,999
Deferred									643	(680)	(537)
Foreign
Current									9,004	12,067	10,158
Deferred									325	1,224	1,196
Total									18,454	23,293	36,035
Income before Taxes
Domestic									34,091	50,626	80,371
Foreign									41,444	45,004	35,351
Income Before Provision for Income Taxes	$ 6,012	$ 18,228	$ 33,206	$ 18,089	$ 10,310	$ 27,847	$ 32,200	$ 25,273	$ 75,535	$ 95,630	$ 115,722