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Schedule II - Valuation and Qualifying Accounts - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ 285	$ (203)	$ (535)
Income Tax Valuation Allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ 248	$ 113	$ 392

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- Definition

Increase (Decrease) To Valuation And Qualifying Accounts For Foreign Currency Translation Adjustment

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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