Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 3,795	$ 2,819	$ 3,812
Additions based on tax position related to current year	1,489	661	221
Additions based on tax position related to prior year	179	352	423
Reductions from settlements and statute of limitation expiration	(650)		(1,469)
Effect of foreign currency translation	154	(37)	(168)
Balance at end of year	$ 4,967	$ 3,795	$ 2,819