Schedule II - Valuation and Qualifying Accounts - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ (203)	$ (535)	$ (332)
Income Tax Valuation Allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ 113	$ 392	$ (643)