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Income Taxes - Summary of Reconciliation of Statutory Income Tax Rate in Mexico to Consolidated Effective Income Tax Rate Recognized (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Statutory income tax rate in Mexico 30.00% 30.00% 30.00%
Impact of non-deductibleand non-taxable items:      
Tax inflation effects 7.30% 17.80% 15.90%
Derivatives 0.40% 1.00% 8.00%
Employee benefits 1.30% 2.20% 4.40%
Other 6.30% 2.60% 9.80%
Equity interest in net loss of associated companies     (0.20%)
Dividends received from associates (0.80%) (1.20%) (7.90%)
Foreign subsidiaries and other non-deductible items, net 1.50% (8.30%) (10.80%)
Effective tax rate 46.00% 43.70% 48.60%
Mexico [member]      
Impact of non-deductibleand non-taxable items:      
Effective tax rate 45.30% 53.60% 68.10%
Brazil [member]      
Impact of non-deductibleand non-taxable items:      
Use of unrecognized tax credits in Brazil   (0.40%) (0.60%)