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Employee Benefits - Summary of Assumptions Used in Determining the Net Period Cost (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Puerto Rico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 2.34% 3.23% 4.45%
Rate of future salary increases 2.75% 2.75% 2.75%
Percentage of increase in health care costs for the coming year 2.28% 3.18% 3.87%
Brazil [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return   7.03% 9.10%
Rate of future salary increases 3.25% 3.80% 4.00%
Percentage of increase in health care costs for the coming year 9.96% 10.30% 10.50%
Year to which this level will be maintained 2031 2029 2029
Brazil [member] | Bottom of range [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 6.48%    
Brazil [member] | Top of range [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 7.39%    
Mexico [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 10.04% 10.50% 11.81%
Rate of future salary increases 2.84% 3.20% 3.55%
Europe [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
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 1.31% 1.38% 1.51%
Europe [member] | Actuarial assumption rate one [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 0.25% 0.75% 1.25%
Rate of future salary increases 3.00% 3.00% 3.00%
Europe [member] | Actuarial assumption rate two [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 0.50% 1.00% 1.75%
Rate of future salary increases 3.50% 3.50% 3.50%
Europe [member] | Actuarial assumption rate three [member]      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Discount rate and long-term rate return 0.75% 1.25% 2.00%
Rate of future salary increases 4.10% 4.40% 4.40%