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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