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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Short and Long Term Receivable) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Beginning Balance  
Interest 0 $ 0
Difference from changes 0 0
Ending Balance 265,875
Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 1,695,921  
Ending Balance 376,790 1,695,921
Compania Laminadora Vista Hermosa, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Ending Balance 183,171  
Operadora Compania Mexicana de Tubos S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Ending Balance 38,232  
Industrias CH, S.A.B. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 530,281  
Ending Balance 730,278 530,281
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 806,397  
Ending Balance 579,047 806,397
Accounts receivable [Member]    
Statement Line Items [Line Items]    
Beginning Balance 201,464 177,101
Interest   0
Loans   0
Difference from changes   0
Payments (145,824)  
Transaction of the year (39,859) 24,363
Ending Balance 15,731 201,464
Accounts receivable [Member] | Pytsa Industrial de Mexico, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 50 437
Transaction of the year (50) (387)
Ending Balance 50
Accounts receivable [Member] | Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 145,824 145,824
Payments (145,824)  
Ending Balance 145,824
Accounts receivable [Member] | Other accounts receivable by operation [Member]    
Statement Line Items [Line Items]    
Beginning Balance 55,590 30,840
Transaction of the year (39,859) 24,750
Ending Balance 15,731 55,590
Short term loans [Member]    
Statement Line Items [Line Items]    
Beginning Balance  
Interest 2,839  
VAT on invoiced interest 0  
Loans 263,036  
Difference from changes 0  
Payments 0  
Transaction of the year 0  
Ending Balance 265,875
Short term loans [Member] | Compania Laminadora Vista Hermosa, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance  
Interest 915  
Loans 182,256  
Ending Balance 183,171
Short term loans [Member] | Compania Manufacturera de Tubos, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance  
Interest 1,039  
Loans 43,433  
Ending Balance 44,472
Short term loans [Member] | Operadora Compania Mexicana de Tubos S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance  
Interest 885  
Loans 37,347  
Ending Balance 38,232
Long term accounts receivable [Member]    
Statement Line Items [Line Items]    
Beginning Balance 648,281 648,239
VAT on invoiced interest 0  
Loans 0  
Difference from changes 0  
Transaction of the year   42
Ending Balance 648,281 648,281
Long term accounts receivable [Member] | Industrias CH, S.A.B. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 648,281 648,239
Transaction of the year   42
Ending Balance 648,281 648,281
Long term loans payable [Member]    
Statement Line Items [Line Items]    
Beginning Balance 3,032,599 2,364,545
Interest 224,639 198,053
VAT on invoiced interest 2,714  
Loans 214,028 412,443
Difference from changes 5,677 57,558
Payments (1,793,542)  
Transaction of the year 0 0
Ending Balance 1,686,115 3,032,599
Long term loans payable [Member] | Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 1,695,921 1,571,048
Interest 136,022 124,873
Payments (1,455,153)  
Ending Balance 376,790 1,695,921
Long term loans payable [Member] | Industrias CH, S.A.B. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 530,281 88,433
Interest 22,953 12,797
VAT on invoiced interest 2,714  
Loans 214,028 412,443
Difference from changes 1,732 16,608
Payments (41,430)  
Ending Balance 730,278 530,281
Long term loans payable [Member] | Perfiles Comerciales Sigosa, S.A. de C.V. [Member]    
Statement Line Items [Line Items]    
Beginning Balance 806,397 705,064
Interest 65,664 60,383
Difference from changes 3,945 40,950
Payments (296,959)  
Ending Balance $ 579,047 $ 806,397