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Fair Value Measurement - Quantitative Disclosures Fair Value Measurement Hierarchy for Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Financial assets at fair value through other comprehensive income $ 2,332    
Investment properties 720 $ 763 $ 653
Available-for-sale financial assets   2,747  
Office buildings for rent [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 290 334  
Significant unobservable inputs (Level 3) [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Available-for-sale financial assets   2,747 $ 2,765
Fair value [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Financial assets (liabilities) - derivatives (142) (139)  
Financial assets at fair value through other comprehensive income 2,332    
Available-for-sale financial assets   2,747  
Fair value [Member] | Land not being used for operation [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 10,656 9,548  
Fair value [Member] | Office buildings for rent [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 1,397 1,303  
Fair value [Member] | Significant observable inputs (Level 2) [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Financial assets (liabilities) - derivatives (142) (139)  
Fair value [Member] | Significant unobservable inputs (Level 3) [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Financial assets at fair value through other comprehensive income 2,332    
Available-for-sale financial assets   2,747  
Fair value [Member] | Significant unobservable inputs (Level 3) [Member] | Land not being used for operation [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 10,656 9,548  
Fair value [Member] | Significant unobservable inputs (Level 3) [Member] | Office buildings for rent [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties $ 1,397 $ 1,303