Revenue Recognition and Accounts Receivable - Schedule of Allowance for Expected Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition [Abstract]
Allowance for expected credit losses beginning balance	$ 3,987
Impact of adoption of ASU 2016-13	1,120
Current period provision for expected credit losses	199	$ 1,891	$ (599)
Writeoffs charged against the allowance and other	(714)
Effect of changes in foreign exchange rates	256
Allowance for expected credit losses ending balance	$ 4,848	$ 3,987