Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets – finite life, net at beginning of period		$ 35,959	$ 31,283	$ 35,959
Amortization expense	$ (1,800)	$ (2,200)	(3,498)	(4,320)
Transfers from indefinite life classification				3,904
Acquisition and related adjustments			4,840
Foreign currency adjustments			11	(16)
Intangible assets – finite life, net at end of period	$ 32,636		$ 32,636	$ 35,527