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Financial information by segments (Schedule of Information on Products) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of products and services [line items] |  |  |
Revenue | $ 35,678,253 | $ 28,700,450 | $ 27,515,565
Light structural [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 1,654,720 | 1,557,567 | 1,467,727
Structural [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 2,441,079 | 2,232,979 | 3,321,771
Bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 1,575,291 | 1,065,731 | 1,122,116
Rebar [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 12,363,530 | 8,931,862 | 7,449,278
Flat rebar [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 2,271,347 | 1,552,578 | 1,090,841
Hot rolled bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 9,549,286 | 8,594,130 | 7,729,167
Cold drawn bars [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | 3,779,385 | 3,370,150 | 3,207,924
Others [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue | $ 2,043,615 | $ 1,395,453 | $ 3,126,741

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