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Fair Value Measurement - Quantitative Disclosures Fair Value Measurement Hierarchy for Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Available-for-sale financial assets $ 2,747 $ 2,765  
Other current financial liabilities -derivatives (139)    
Other current financial assets-derivatives   187  
Investment properties 763 653 $ 667
Office buildings for rent [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 334 344  
Fair value [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Available-for-sale financial assets 2,747 2,765  
Other current financial liabilities -derivatives (139)    
Other current financial assets-derivatives   187  
Fair value [Member] | Land not being used for operation [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 9,548 8,851  
Fair value [Member] | Office buildings for rent [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Investment properties 1,303 924  
Fair value [Member] | Significant observable inputs (Level 2) [Member]      
Disclosure of fair value measurement of assets (liabilities) [Line Items]      
Other current financial liabilities -derivatives (139)    
Other current financial assets-derivatives   187  
Fair value [Member] | 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] | 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 9,548 8,851  
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 $ 1,303 $ 924