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Legal Proceedings - Additional Information (Detail) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 13, 2013 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Lease contract for a period | 5 years |  |  |  |  |  |
Cash advances by CEMEX Colombia |  | $ 13.4 |  |  |  |  |
Interest for advances |  | $ 1.2 |  |  |  |  |
Purchase of the assets related to the project in Colombian pesos |  |  |  | $ 14.3 |  |  | $ 295
Impairment loss |  |  | $ 984 |  | $ 1,899 | $ 1,145 |
VAT Payable [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Accounts payable |  |  |  | 9.2 |  |  | 191
Bottom of range [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Expiration of property over the aforementioned assets |  | 5 years | 5 years |  |  |  |
Top of range [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Expiration of property over the aforementioned assets |  | 10 years | 10 years |  |  |  |
Maceo plant [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Impairment loss |  |  |  | 0.0 |  |  |
Consideration transferred |  |  |  | $ 9.1 |  |  | $ 188
Investment in plant |  | $ 340.0 |  |  |  |  |
Net book value of adjustment in investment property |  | $ 333.0 | $ 6,543 |  |  |  |

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