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Significant events (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 shares | Dec. 31, 2017 shares | May 01, 2018 T | Dec. 05, 2017 MXN ($) shares | Jan. 13, 2016 MXN ($) shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Increased in capital stock, shares | (140,000) | (3,539,000) |  |  |
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 |  |
GSIM de Occidente, S.A. de C.V. [Member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Investment | $ |  |  |  |  | $ 50
GSIM de Occidente, S.A. de C.V. [Member] | Stockholders Grupo Simec Class I Shares [Member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of shares in investment |  |  |  |  | 49,999
Fundiciones de Acero Estructural, S.A. de C.V. [Member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Investment | $ |  |  |  |  | $ 50
Fundiciones de Acero Estructural, S.A. de C.V. [Member] | Stockholders Grupo Simec Class I Shares [Member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of shares in investment |  |  |  |  | 49,999

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