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Investment Properties - Amount Recognized in Profit Arising from Investment Properties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Rental Income From Investment Property Net Of Direct Operating Expense [Abstract]      
Rental income derived from investment properties $ 190 $ 78 $ 84
Direct operating expenses (including repairs and maintenance) generating rental income (145) (34) (36)
Net profit arising from investment properties carried at cost $ 45 $ 44 $ 48