Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets - finite life, Beginning of period			$ 74,957	$ 58,398
Amortization expense	$ (3,700)	$ (2,600)	(7,645)	(5,230)
Foreign currency adjustments			76	(748)
Intangible assets - finite life, End of period	$ 67,388	$ 52,420	$ 67,388	$ 52,420