XML 152 R130.htm IDEA: XBRL DOCUMENT v3.20.1
Investment Properties - Net Book 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
Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 1,183 1,125  
Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (453) (405)  
Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 467 430  
Land [Member] | Gross carrying amount [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  
Office buildings for rent [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 716 695  
Office buildings for rent [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ (453) $ (405)