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Investment Properties - Fair Value of Investment Properties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 730 $ 720 $ 763
Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 467 430  
Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 263 290  
Fair value [Member] | Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 11,566 10,656  
Fair value [Member] | Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 1,460 $ 1,397