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Significant Accounting Policies - Additional Information (Detail) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 05, 2017 Quarry Plant MT | Dec. 31, 2017 MXN ($) shares | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) shares
Disclosure of significant accounting policies [line items] |  |  |  |
Capitalization of retained earnings |  | $ 0 | $ 0 | $ 0
Share-based compensation |  | 817 | 742 | 655
Decrease in debt |  | 5,468 |  | 4,517
Increase (decrease) through conversion of convertible instruments |  | $ 5,729 |  | $ 5,051
Issuance of convertible subordinated notes | shares |  | 43 |  | 42
Increase in debt and in other current accounts receivable |  |  | $ 148 |
Minimum equity interest for significant influence |  | 20.00% |  |
Useful life of intangible asset |  | 3 to 20 years |  |
Statutory income tax rate |  | 30.00% | 30.00% | 30.00%
Mexico [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Statutory income tax rate |  | 30.00% | 30.00% | 30.00%
Computer software [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Useful life of intangible asset |  | 5 years |  |
Extraction rights [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Useful life of intangible asset |  | 30 to 100 years |  |
Bottom of range [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Cumulative inflation rate over the last three years |  | 100.00% |  |
Threshold to declare and maintain a hedge |  | 0.80 |  |
Top of range [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Threshold to declare and maintain a hedge |  | 1.25 |  |
Announcement of Plan to Discontinue Operation [Member] | Duna-Drava Cement Kft [Member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Number of cement plats sold | Plant | 3 |  |  |
Number of quarries sold | Quarry | 2 |  |  |
Number of ready mix plants sold | Plant | 7 |  |  |
Annual production capacity of cement plant sold | MT | 2.4 |  |  |
Mobile equipment [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Carrying amount of assets acquired through capital lease |  | $ 2,096 | $ 7 | $ 63
Issued capital and additional paid-in capital [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Capitalization of retained earnings |  | 9,464 | 6,970 | 7,617
Additional paid-in capital [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Capitalization of retained earnings |  | 9,459 | 6,966 | 7,613
Share-based compensation |  | 791 | $ 742 | 655
Increase (decrease) through conversion of convertible instruments |  | 7,059 |  | 5,982
Equity Reserve [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Increase (decrease) through conversion of convertible instruments |  | (1,334) |  | (934)
Common Stock [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Increase (decrease) through conversion of convertible instruments |  | $ 4 |  | $ 3
US Dollar [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Closing exchange rate |  | 19.6500 | 20.7200 | 17.2300
Average exchange rate |  | 18.8800 | 18.7200 | 15.9800

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