Income Taxes - Schedule of Provision for Taxes on Income and Other Related Income Before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal
Current									$ 7,697	$ 3,362	$ 9,744
Deferred									3,890	4,338	(285)
State
Current									1,559	782	1,223
Deferred									(225)	643	(680)
Foreign
Current									14,562	9,004	12,067
Deferred									(664)	325	1,224
Total									26,819	18,454	23,293
Income before Taxes
Domestic									48,721	34,091	50,626
Foreign									54,135	41,444	45,004
Income Before Provision for Income Taxes	$ 15,061	$ 33,113	$ 24,146	$ 30,536	$ 6,012	$ 18,228	$ 33,206	$ 18,089	$ 102,856	$ 75,535	$ 95,630