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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal
Current									$ 18,811	$ 7,697	$ 3,362
Deferred									(3,192)	3,890	4,338
State
Current									2,273	1,559	782
Deferred									(1,171)	(225)	643
Foreign
Current									14,960	14,562	9,004
Deferred									(4,063)	(664)	325
Total									27,618	26,819	18,454
Income before Taxes
Domestic									64,675	48,721	34,091
Foreign									49,141	54,135	41,444
Income Before Provision for Income Taxes	$ 7,009	$ 27,143	$ 39,196	$ 40,468	$ 15,061	$ 33,113	$ 24,146	$ 30,536	$ 113,816	$ 102,856	$ 75,535