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Other Financial Assets and Financial Liabilities - Reconciliation of the Beginning and Closing Balances of Available-for-sale Financial Instruments Classified as Level 3 Within the Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Beginning balance $ 2,765  
Ending balance 2,747 $ 2,765
Available-for-sale financial assets [Member] | Significant unobservable inputs (Level 3) [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Beginning balance 2,765 2,862
Re-measurement recognized in other comprehensive income (loss) (80) (102)
Exchange difference 62 5
Ending balance $ 2,747 $ 2,765