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Income Taxes - Summary of Reconciliation Between Tax Expense and Income Before Income Taxes (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Mexican statutory income tax rate 30.00% 30.00% 30.00%
Income tax from prior years 4.98% 1.33% 0.50%
Income (loss) on monetary position for subsidiaries in hyperinflationary economies 6.72% (2.20%) 0.07%
Annual inflation tax adjustment (5.75%) 0.15% (2.22%)
Non-deductible expenses (8.84%) 2.38% 2.92%
Non-taxable income 1.87% (0.90%) (0.41%)
Income taxed at a rate other than the Mexican statutory rate (3.50%) 2.06% 0.75%
Effect of restatement of tax values 8.72% (2.29%) (1.16%)
Effect of change in statutory rate 0.31%   0.11%
Effect of changes in Venezuela Tax Law   7.74%  
Income tax credits 12.70% (7.84%)  
Effect Venezuela (Note 3.3) (119.13%)    
Consolidation Profit Philippines 11.95%    
Tax Loss (9.45%)    
Other 5.28% (2.98%) 0.35%
Total (64.14%) 27.45% 30.91%