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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
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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%

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