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Intangible Assets - Disclosure of Detailed Information About Sensitivity to Changes in Assumptions (Detail)
 12 Months Ended
Dec. 31, 2017
Mexico [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.16%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 5.2x
Guatemala [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 1.52%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 7.4x
Nicaragua [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 4.27%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 3.1x
Costa Rica [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.64%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 2.3x
Panama [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.12%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 12.1x
Colombia [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.19%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 2.5x
Brazil [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.26%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 3.6x
Argentina [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 4.39%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 299x
Philippinnes [member]  
Disclosure of detailed information about intangible assets [line items]  
Changes in WACC 0.46%
Changes in volume growth CAGR (1.00%)
Effect on Valuation Passes by 2.1x