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Income Tax - Reconciliation of Beginning and Ending Amounts of Uncertain Tax Position (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Change In Tax Positions [Abstract] |  |  |
Beginning balance | $ 828 | $ 1,856 | $ 2,144
Additions based on tax positions related to the current year |  | 0 | 0
Decrease due to lapses in statute of limitations | (175) | (923) | (176)
Exchange difference | 53 | (105) | (112)
Ending balance | $ 706 | $ 828 | $ 1,856

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