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Employee Benefits - Summary of Assumptions Used in Determining the Net Period Cost (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Puerto Rico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 3.61% 4.16% 4.42%
Rate of future salary increases 2.75% 3.50% 3.50%
Percentage of increase in health care costs for the coming year 3.57% 4.20% 5.70%
Year to which this level will be maintained N/A N/A 2027
Brazil [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 10.18% 10.84% 12.57%
Rate of future salary increases 4.50% 4.85% 5.00%
Percentage of increase in health care costs for the coming year 11.00% 11.35% 11.50%
Year to which this level will be maintained 2028 2017  
Mexico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 10.70% 10.70% 9.20%
Rate of future salary increases 4.50% 4.50% 4.50%
Europe [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 1.00% 1.00%  
Rate of increase of pensions 1.60% 1.60% 1.60%
Europe [member] | Bottom of range [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Employee turnover rate 0.00% 0.00% 0.00%
Europe [member] | Top of range [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Employee turnover rate 1.72% 1.88% 2.06%
Europe [member] | Actuarial assumption rate one [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 1.50% 1.50% 1.25%
Rate of future salary increases 3.00% 3.00% 4.90%
Europe [member] | Actuarial assumption rate two [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 2.00% 1.75% 2.25%
Rate of future salary increases 3.50% 3.90% 3.00%
Europe [member] | Actuarial assumption rate three [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Rate of future salary increases 4.40% 4.40% 4.50%