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Goodwill and Intangible Assets, Net - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Amortization of intangible assets of definite useful life recognized within operating costs and expenses |  | $ 2,037 | $ 1,950 | $ 1,572
Amount of net book value in excess of net present value of projected cash flows | $ 98 | $ 1,920 |  |
Decrease in funding cost percentage | 6.10% | 6.10% | 6.20% | 6.90%
Decrease increase in risk free rate | 2.76% | 2.76% | 2.70% | 3.20%
Risk associated with goodwill | 1.26 | 1.26 | 1.29 |
Increase in pre-tax discount rate | 1.00% | 1.00% |  |
Decrease in long-term growth rate | 1.00% | 1.00% |  |
Weighted average Operating EBITDA multiple | 9.0 | 9.0 | 9.0 | 9.0
Operating EBITDA multiple | 8.5 | 8.5 | 8.9 | 8.7
Lowest multiple | 6.5 | 6.5 | 5.9 | 5.8
Highest multiple | 18.9 | 18.9 | 18.3 | 18.0
Top of range [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Cash flow projection period | 10 years | 10 years |  |
Bottom of range [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Cash flow projection period | 5 years | 5 years |  |
United States [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Percentage of goodwill allocated | 78.00% | 78.00% | 79.00% |
Percentage of increases in ready-mix concrete volumes |  |  | 1.00% | 13.00%
Percentage of increases in ready-mix concrete prices | 1.00% | 1.00% | 1.00% | 5.00%
Percentage of decreases in ready-mix concrete volumes | 1.00% | 1.00% |  |

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