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Transactions and balances with related parties (Schedule of Balances Receivable from and Payable to Related Parties) (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | $ 52,706 | $ 13,925
Loans to related parties, long term | 1,008,743 | 923,257
Total long term | 1,657,024 | 1,571,538
Accounts payable | 351,511 | 241,526
Industrias CH, S.A.B. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 6,073 |
Ca. Laminadora Vista Hermosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 611 |
Operadora Compania Mexicana de Tubos, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 848 |
Accounts payable | 6,287 | 0
Cia Tubos y Perfiles Monterrey, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 3,318 |
Operadora Perfiles Sigosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 3,452 |
Accounts payable | 3,855 | 5,850
Operadora Construalco, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 3,320 | 717
Operadora Industrial de Herramientas, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 411 | 38
Joist del Golfo, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 12,192 | 5,105
Ferrovisa, S.A. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 17,762 |
Other accounts receivable by operation [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 782 | 5,816
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable |  | 2,250
Loans to related parties | 150,233 | 142,268
Aceros y Laminados Sigosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 4,625 | 1,853
Industrias CH, S.A.B. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable | 648,281 | 648,281
Loans to related parties | 858,510 | 780,989
Accounts payable | 214,294 | 208,223
Perfiles Comeciales Sigosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 1,292 | 3,632
Holding Protel, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 251 | 251
Compania Laminadora Vista Hermosa, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 1,404 | 1,904
Operadora Pytsa Industrial, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 9,073 | 8,233
Comercializadora SIGOSA, S.A. de C.V.[Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 102,067 | 0
Compania Manufacturera de Tubos, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 7,377 | 9,631
Cia. Mexicana de Perfiles y Tubos, S.A. de C.V. [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | 634 |
Others [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Accounts payable | $ 352 | $ 1,949

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