Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets – finite life, net at beginning of period	$ 35,959	$ 49,956
Amortization expense	(2,160)	(2,555)
Divestitures		(2,372)
Transfers from indefinite life classification	3,904
Foreign currency adjustments	(70)	259
Intangible assets – finite life, net at end of period	$ 37,633	$ 45,288