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Income taxes (Narrative) (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Effective tax rate | [1] | 17.92% | 17.92% | 37.21% | 17.68%
USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  |  | $ 9,014,364 |  |
GV do Brasil Industria e Comercio of Aco LTDA [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  |  | 1,025,000 | $ 1,025,000 |
GV do Brasil Industria e Comercio of Aco LTDA [Member] | Brazil, Brazil Real [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  |  | $ 202,008 | $ 202,008 |
Mexican companies [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Effective tax rate |  | 30.00% | 30.00% | 30.00% | 30.00%
Description of decree issued by finance ministry |  | As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR, to the taxpayers who had obtained income from its business activity in the last period, up to 100 million pesos. | As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR, to the taxpayers who had obtained income from its business activity in the last period, up to 100 million pesos. |  |
Percentage of investment of new fixed assets |  | 69.00% | 69.00% | 85.00% | 82.00%
Republic [Member] | USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  | $ 240,200 |  |  |
Expiration period |  | expire between 2033 and 2038 | expire between 2033 and 2038 |  |
State and local [Member] | USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  | $ 338,000 |  |  |
Expiration period |  | expire between 2019 and 2038 | expire between 2019 and 2038 |  |
Canada [Member] | USD [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax losses |  | $ 4,700 |  |  |
Expiration period |  | expire between 2032 and 2037 | expire between 2032 and 2037 |  |
[1] | This amount includes $ 9,014,364 corresponding to a tax loss from the sale of shares which, according to the Income Tax Law, can only be applied against taxable profits on the sale of shares generated in the future.

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