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Employee Benefits - Summary of Assumptions Used in Determining the Net Period Cost (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Puerto Rico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 4.45% 3.61% 4.16%
Rate of future salary increases 2.75% 2.75% 3.50%
Percentage of increase in health care costs for the coming year 3.87% 3.57% 4.20%
Year to which this level will be maintained N/A N/A N/A
Brazil [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 9.10% 10.18% 10.84%
Rate of future salary increases 4.00% 4.50% 4.85%
Percentage of increase in health care costs for the coming year 10.50% 11.00% 11.35%
Year to which this level will be maintained 2029 2028 2017
Mexico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 11.81% 10.70% 10.70%
Rate of future salary increases 3.55% 4.50% 4.50%
Rate of increase of pensions 3.47% 3.83% 3.83%
Europe [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 1.25% 1.00% 1.00%
Rate of future salary increases     3.00%
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 1.51% 1.72% 1.88%
Europe [member] | Actuarial assumption rate one [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 1.75% 1.50% 1.50%
Rate of future salary increases 3.00% 3.00% 3.90%
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% 2.00% 1.75%
Rate of future salary increases 3.50% 3.50% 4.40%
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%