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Goodwill and Intangible Assets, Net - Summary of Pre-tax Discount Rates and Long-term Growth Rates Used to Determine the Discounted Cash Flows (Detail)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United States [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.50% 8.80% 8.60%
Growth rates 2.50% 2.50% 2.50%
Spain [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.80% 9.50% 9.50%
Growth rates 1.70% 1.70% 1.60%
Mexico [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 9.40% 10.20% 9.80%
Growth rates 3.00% 2.70% 2.90%
Colombia [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 9.50% 10.50% 10.00%
Growth rates 3.60% 3.70% 4.00%
France [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.40% 9.00% 9.10%
Growth rates 1.60% 1.80% 1.80%
United Arab Emirates [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 11.00% 10.40% 10.20%
Growth rates 2.90% 3.10% 3.40%
United Kingdom [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.40% 9.00% 8.80%
Growth rates 1.60% 1.70% 1.90%
Egypt [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 10.80% 11.80% 11.40%
Growth rates 6.00% 6.00% 6.00%
Bottom of range [member] | Other countries [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.50% 9.10% 9.10%
Growth rates 2.50% 2.30% 2.20%
Top of range [member] | Other countries [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 13.30% 11.70% 12.80%
Growth rates 6.90% 6.80% 7.00%