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Schedule II - Valuation and Qualifying Accounts - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 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. + References No definition available. + Details
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- Details
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