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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]      
Discount rates 7.80% 7.70%  
Growth rates 2.50% 2.00%  
United States [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 7.30% 7.80% 8.50%
Growth rates 2.00% 2.50%  
Spain [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 7.70% 8.30% 8.80%
Growth rates 1.50% 1.60% 1.70%
Mexico [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.30% 9.00% 9.40%
Growth rates 1.10% 2.40% 3.00%
Colombia [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.40% 8.90% 9.50%
Growth rates 2.50% 3.70% 3.60%
France [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 7.40% 8.00% 8.40%
Growth rates 1.70% 1.40% 1.60%
United Arab Emirates [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 8.30% 8.80% 11.00%
Growth rates 2.60% 2.50% 2.90%
United Kingdom [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 7.40% 8.00% 8.40%
Growth rates 1.60% 1.50% 1.60%
Egypt [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 10.20% 10.30% 10.80%
Growth rates 5.60% 6.00% 6.00%
Bottom of range [member] | Other countries [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 7.20% 8.10% 8.50%
Growth rates (0.30%) 1.60% 2.30%
Top of range [member] | Other countries [member]      
Disclosure of information for cash-generating units [line items]      
Discount rates 15.50% 11.00% 13.30%
Growth rates 6.50% 6.50% 6.90%