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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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United States [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 8.80% | 8.60% | 8.60%
Growth rates | 2.50% | 2.50% | 2.50%
Spain [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 9.50% | 9.50% | 9.90%
Growth rates | 1.70% | 1.60% | 1.90%
Mexico [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 10.20% | 9.80% | 9.60%
Growth rates | 2.70% | 2.90% | 3.50%
Colombia [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 10.50% | 10.00% | 9.80%
Growth rates | 3.70% | 4.00% | 4.00%
France [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 9.00% | 9.10% | 9.00%
Growth rates | 1.80% | 1.80% | 1.60%
United Arab Emirates [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 10.40% | 10.20% | 10.20%
Growth rates | 3.10% | 3.40% | 3.60%
United Kingdom [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 9.00% | 8.80% | 8.80%
Growth rates | 1.70% | 1.90% | 2.30%
Egypt [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 11.80% | 11.40% | 12.50%
Growth rates | 6.00% | 6.00% | 4.60%
Bottom of range [member] | Other countries [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 9.10% | 9.10% | 9.00%
Growth rates | 2.30% | 2.20% | 2.40%
Top of range [member] | Other countries [member] |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Discount rates | 11.70% | 12.80% | 13.80%
Growth rates | 6.80% | 7.00% | 4.30%

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