Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets – finite life, net at beginning of period			$ 35,959	$ 49,956
Amortization expense	$ (2,200)	$ (2,400)	(4,320)	(4,988)
Divestitures				(2,372)
Transfers from indefinite life classification			3,904
Foreign currency adjustments			(16)	(152)
Intangible assets – finite life, net at end of period	$ 35,527	$ 42,444	$ 35,527	$ 42,444