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Investment Properties - Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ 763 $ 653 $ 667
Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 1,141 968  
Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties (378) (315)  
Land [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 429 309  
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 429 309  
Office buildings for rent [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 334 344  
Office buildings for rent [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties 712 659  
Office buildings for rent [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about investment property [Line Items]      
Investment properties $ (378) $ (315)