Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - finite life, Beginning of period			$ 58,398	$ 46,611
Amortization expense	$ (3,300)	$ (1,700)	(8,513)	(5,342)
Acquisitions/purchase accounting adjustments			34,900
Foreign currency adjustments			(810)	(870)
Intangible assets - finite life, End of period	$ 83,975	$ 40,399	$ 83,975	$ 40,399