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Investment Properties - Amount Recognized in Profit Arising from Investment Properties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rental Income From Investment Property Net Of Direct Operating Expense [Abstract]      
Rental income derived from investment properties $ 68 $ 36 $ 16
Direct operating expenses (including repairs and maintenance) generating rental income (1) (1) (1)
Direct operating expenses (including repairs and maintenance) that did not generate rental income (1) (1) (1)
Net profit arising from investment properties carried at cost $ 66 $ 34 $ 14