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Financial information by segments (Schedule of Information on Products) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of products and services [line items] |  |  |
Revenue | $ 35,869,314 | $ 34,171,201 | $ 35,678,253
Light structural [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 1,529,216 | 1,396,632 | 1,654,720
Structural [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 3,677,441 | 3,304,178 | 2,441,079
Bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 2,061,053 | 2,220,264 | 1,575,291
Rebar [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 14,081,399 | 12,370,490 | 12,363,530
Flat rebar [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 1,851,960 | 1,833,576 | 2,271,347
Hot rolled bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 7,548,939 | 8,226,613 | 9,549,286
Cold drawn bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 2,139,938 | 3,102,544 | 3,779,385
Others [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | $ 2,989,368 | $ 1,716,904 | $ 2,043,615

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