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Transactions and balances with related parties (Narrative) (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Jan. 12, 2017
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of transactions between related parties [line items]              
Borrowings           $ 3,032,599 $ 2,364,545
Interest rate     0.25% 0.25% 0.25% 0.25%  
Exchange rate [1]   19.23 18.94        
USD [Member]              
Disclosure of transactions between related parties [line items]              
Loan payable     $ 50,000 $ 50,000      
Compania Manufacturera de Tubos, S.A. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         $ 43,433    
Interest         1,039    
Balance amount         44,472    
Compania Manufacturera de Tubos, S.A. de C.V. [Member] | USD [Member]              
Disclosure of transactions between related parties [line items]              
Loan       2,209,600      
Laminadora Vista Hermosa Company, S.A. de C.V [Member]              
Disclosure of transactions between related parties [line items]              
Loan         182,256    
Interest         915    
Balance amount         183,171    
Laminadora Vista Hermosa Company, S.A. de C.V [Member] | USD [Member]              
Disclosure of transactions between related parties [line items]              
Loan       9,272,000      
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         37,347    
Interest         885    
Balance amount         38,232    
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member] | USD [Member]              
Disclosure of transactions between related parties [line items]              
Loan       1,900,000      
Compania Manufacturera de Tubos, S.A. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         37,347    
Industrias CH, S.A.B. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         499,278 $ 422,338  
Borrowings         730,278 530,281 88,433
Interest         19,653 9,200  
Balance amount         518,931 431,538  
Value added tax payables         2,714    
Loan payable         211,347    
Industrias CH, S.A.B. de C.V. [Member] | USD [Member]              
Disclosure of transactions between related parties [line items]              
Loan     $ 21,400,000 $ 25,400,000      
Industrias CH, S.A.B. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         186,752 89,363  
Interest         21,881 9,380  
Balance amount         3 98,743  
Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         1,455,153   1,549,352
Borrowings           1,695,921 1,571,048
Interest         136,022 124,873 18,906
Balance amount         376,790 1,695,921 1,571,048
Value added tax payables             2,790
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]              
Disclosure of transactions between related parties [line items]              
Loan         296,959 721,382 680,432
Borrowings           806,397 705,064
Interest         65,664 60,383 24,632
Balance amount         $ 579,047 $ 806,397 705,064
Exchange rate 21.9076            
Exchange amount $ 721,382 $ 3,945          
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] | USD [Member]              
Disclosure of transactions between related parties [line items]              
Borrowings             $ 32,928,400
[1] Average exchange rate used to translate revenues, costs and expenses of the companies mentioned above.