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Investments in Associates - Movements in Investments in Associates (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Significant Investments In Associates [Abstract]      
Balance at January 1 $ 786 $ 1,633  
Additions   0  
Share of loss of associates (3) (710) $ (801)
Impairment of investment in associates   (126)  
Exchange difference 78 (11)  
Balance at December 31 $ 861 $ 786 $ 1,633