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Investment Properties - Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 720 $ 763 $ 653
Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 1,125 1,141  
Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (405) (378)  
Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 430 429  
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 430 429  
Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 290 334  
Office buildings for rent [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 695 712  
Office buildings for rent [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ (405) $ (378)