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Subsequent Events - Additional (Detail) $ in Thousands, € in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  |  | 12 Months Ended
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Apr. 09, 2018 USD ($) | Apr. 09, 2018 COP ($) | Mar. 29, 2018 USD ($) | Mar. 15, 2018 USD ($) | Feb. 14, 2018 | Jan. 10, 2018 EUR (€) | Jan. 05, 2018 USD ($) | Jan. 05, 2018 MXN ($) | Apr. 11, 2011 USD ($) | Apr. 11, 2011 MXN ($) | Dec. 31, 2017
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Increase in tax to be paid |  |  |  |  |  |  |  |  | $ 30,000 | $ 593 |
Income tax penalty imposed |  |  |  |  |  |  |  |  | $ 48,000 | $ 948 |
Lehigh White Cement Company [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  | 24.50%
CEMEX, S.A.B. de C.V. January 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Payment of debt principal outstanding and accrued interest | € |  |  |  |  |  | € 419 |  |  |  |  |
Debt principal amount outstanding | € |  |  |  |  |  | € 400 |  |  |  |  |
Events after reporting period [member] | Convertible subordinated notes due 2018 [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Payment of debt principal outstanding and accrued interest |  |  |  | $ 372,000 |  |  |  |  |  |  |
Debt principal amount outstanding |  |  |  | 365,000 |  |  |  |  |  |  |
Events after reporting period [member] | CEMEX, S.A.B. de C.V. January 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Payment of debt principal outstanding and accrued interest |  |  |  | 357,000 |  |  |  |  |  |  |
Debt principal amount outstanding |  |  |  | $ 341,000 |  |  |  |  |  |  |
Events after reporting period [member] | Colombia [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Increase in tax to be paid | $ 42,000 | $ 124,790 |  |  |  |  |  |  |  |  |
Income tax penalty imposed | $ 42,000 | $ 124,790 |  |  |  |  |  |  |  |  |
Events after reporting period [member] | Lehigh White Cement Company [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 36.75% |  |  |  |  |  |
Payment for ownership interest |  |  | $ 34,000 |  |  |  |  |  |  |  |
Superintendencia de Industria y Comercio [member] | Entering into significant commitments or contingent liabilities [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |
Payment of fine imposed |  |  |  |  |  |  | $ 25,000 | $ 491 |  |  |

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