Accounts Receivable - Summary of Activity in the Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 2,044	$ 2,517	$ 2,339
Additions	505	231	628
Write-offs	(562)	(692)	(400)
Currency impact	57	(12)	(50)
Balance at end of year	$ 2,044	$ 2,044	$ 2,517