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Basis of preparation and presentation of the consolidated financial statements (Narrative) (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Mg | Dec. 31, 2020 MXN ($) Mg | Dec. 31, 2019 USD ($) Mg | Dec. 31, 2019 MXN ($) Mg
Disclosure of subsidiaries [line items] |  |  |  |
Coke inventory | Mg | 136,541 | 136,541 | 136,541 | 136,541
Coke inventory, value |  | $ 953,000 |  | $ 747,000
Bottom of range [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage range of changes in fair value or cash flows of hedging instrument | 80.00% |  |  |
Top of range [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage range of changes in fair value or cash flows of hedging instrument | 125.00% |  |  |
USD [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Average price of coke per metric tons | $ 350 |  | $ 290 |
ICH (Holding Company) share in SimRep Corporation and Subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of equity owned | 0.59% |  |  |

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