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Investment Properties - Reconciliation of Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Changes In Investment Property [Abstract]    
Net book value at January 1 $ 653 $ 667
Depreciation (included in administrative expenses) (35) (24)
Addition 84  
Disposals   (229)
Transfer from property plant and equipment   240
Exchange difference 61 (1)
Net book value at December 31 $ 763 $ 653