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Income Tax - Reconciliation of Beginning and Ending Amounts of Uncertain Tax Position (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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