Goodwill and Intangible Assets - Schedule of Changes in Intangible Assets, Net of Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]
Net balance at January 1	$ 111,300
Additions	121	$ 11,100
Amortization expense	(11,570)	(11,119)
Currency translation	1,174	1,830
Net balance at December 31	101,100	111,300
Intangible assets, net (Note 12)	$ 161,051	$ 171,326	$ 169,515