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Significant events (Details) $ / shares in Units, $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) shares $ / shares | May 01, 2018 T | Dec. 05, 2017 MXN ($) shares
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Senales del Norte S.A. de C.V. [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Shares acquired by subsidiary, value | $ |  |  | $ 122,660
Senales del Norte S.A. de C.V. [Member] | Class I Shares [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Shares acquired by subsidiary |  |  | 2,000
Percentage of capital stock acquired by subsidiary |  |  | 100.00%
Senales del Norte S.A. de C.V. [Member] | Class II Shares [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Shares acquired by subsidiary |  |  | 3,908,782
Percentage of capital stock acquired by subsidiary |  |  | 100.00%
First Steel Mill of ArcelorMittal in Brazil [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Production capacity | T |  | 600,000 |
Second Steel Mill of ArcelorMittal in Brazil [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Production capacity | T |  | 120,000 |
SimRep Corporation [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Shares acquired by subsidiary | 83,862 |  |
Percentage of capital stock acquired by subsidiary | 99.41% |  |
Number of common shares acquired per share price | $ / shares | $ 3,454 |  |
Amount of Consideration | $ | $ 289,660 |  |

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