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Investment Properties - Fair 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
Land [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  
Warehouse      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 5,577    
Land leasehold right [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 95    
Fair value [Member] | Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 11,521 11,566  
Fair value [Member] | Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 2,060 $ 1,460  
Fair value [Member] | Warehouse      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 5,701    
Fair value [Member] | Land leasehold right [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 96