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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Estimate Impairment Evaluations (Parenthetical) (Detail) - Country
Dec. 31, 2017
Dec. 31, 2016
Disclosure of impairment of assets [line items]    
Number of countries 25  
Europe [member]    
Disclosure of impairment of assets [line items]    
Number of countries 7 7