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Post-Employment and Other Non-current Employee Benefits - Summary of Long-term Assumptions (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial:      
Discount rate used to calculate the defined benefit obligation 7.60% 7.60% 7.00%
Salary increase 4.60% 4.50% 4.50%
Future pension increases 3.50% 3.50% 3.50%
Biometric:      
Mortality EMSSA 2009 EMSSA 2009 EMSSA 2009
Disability IMSS-97 IMSS-97 IMSS-97
Normal retirement age 60 years 60 years 60 years
Rest of employee turnover BMAR2007 BMAR2007 BMAR2007