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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, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]    
Accounts receivable $ 13,925 $ 15,731
Loans to related parties   265,875
Loans to related parties, long term 923,257 1,686,115
Balances receivable 13,925 281,606
Total long term 1,571,538 2,334,396
Accounts payable 241,526 334,591
Compania Laminadora Vista Hermosa, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable   360
Loans to related parties   183,171
Accounts payable 1,904  
Operadora Construalco, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable 717 548
Operadora Industrial de Herramientas, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable 38 912
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable 2,250 1,597
Loans to related parties 142,268 579,047
Accounts payable 3,632  
Joist del Golfo, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable 5,105 6,516
Other accounts receivable by operation [Member]    
Disclosure of transactions between related parties [line items]    
Accounts receivable 5,815 5,798
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Loans to related parties   38,232
Compania Manufacturera de Tubos, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Loans to related parties   44,472
Accounts payable 9,631 6,220
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 780,989 730,278
Accounts payable 208,223 205,879
Proyectos Comerciales el Ninzi, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Loans to related parties   376,790
Aceros y Laminados Sigosa, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable 1,853 1,854
Holding Protel, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable 251  
Operadora Perfiles Sigosa, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable 5,850 112,587
Operadora Pytsa Industrial, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable 8,233 5,185
Tuberias Procarsa, S.A. de C.V. [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable   1,942
Others [Member]    
Disclosure of transactions between related parties [line items]    
Accounts payable $ 1,949 $ 924