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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, 2018	Dec. 31, 2017
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