Schedule II - Valuation and Qualifying Accounts - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ (107)	$ (1,058)	$ (291)
Income Tax Valuation Allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ (41)	$ 104	$ (367)