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Investment Properties - Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 6,378 $ 730 $ 720
Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 7,005 1,183  
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (627) (453)  
Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 466 467  
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 466 467  
Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 240 263  
Office buildings for rent [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 742 716  
Office buildings for rent [Member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (502) $ (453)  
Warehouse      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 5,577    
Warehouse | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 5,701    
Warehouse | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (124)    
Land leasehold right [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 95    
Land leasehold right [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 96    
Land leasehold right [Member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ (1)