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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Adjustment in Loans Payable) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Beginning Balance, Loans payable $ 980,807 $ 1,010,159 $ 1,012,667
Transfer of accounts receivable for presentation     1,435
Transfer of loans payable by presentation     (3,943)
Transactions of the year 0 0  
Interest 7,023 6,040  
Difference in changes (4,762) (35,392)  
Payment (983,068)    
Ending Balance, Loans payable 980,807 1,010,159
Industrias CH, S.A.B. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Loans payable 226,820 222,626 221,628
Transfer of accounts receivable for presentation     998
Interest 5,570 4,194  
Difference in changes  
Payment (232,390)    
Ending Balance, Loans payable 0 226,820 222,626
Tuberias Procarsa, S.A. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Loans payable 591,789 618,118 622,061
Transfer of loans payable by presentation     (3,943)
Interest 1,321 1,449  
Difference in changes (2,363) (27,778)  
Payment (590,747)    
Ending Balance, Loans payable 0 591,789 618,118
Procarsa Tube and Pipe Co. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Loans payable 59,648 62,303 62,303
Interest 132 146  
Difference in changes (370) (2,801)  
Payment (59,410)    
Ending Balance, Loans payable 0 59,648 62,303
Pytsa Industrial de Mexico, S.A. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Loans payable 102,550 107,112 106,675
Transfer of accounts receivable for presentation     437
Interest   251  
Difference in changes (2,029) (4,813)  
Payment (100,521)    
Ending Balance, Loans payable $ 0 $ 102,550 $ 107,112