Goodwill and Other Intangible Assets - Schedule of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 650,778
Additions	25,050
Foreign currency translation adjustments	(11,292)
Goodwill adjustments	2,659
Goodwill, ending balance	$ 667,195