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Other Financial Assets and Financial Liabilities - Description of Significant Unobservable Inputs to Valuation (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Liquidity discount 30.00% 30.00%
Available-for-sale financial assets [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Valuation technique Market Approach Method  
Significant unobservable inputs Liquidity Discount  
Liquidity discount 30.00% 30.00%
Sensitivity of the input to fair value 5% decrease in the discount would increasein fair value by $203 5% decrease in the discount would increase in fair value by $204