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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Adjustment in Accounts Payable) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Beginning Balance, Accounts payable $ 251,676 $ 218,849 $ 7,867
Transactions of the year 82,915 32,827  
Interest 0 0  
Difference in changes 0 0  
Transfer of accounts receivable for presentation     207,039
Transfer of loans payable for presentation     3,943
Ending Balnce, Accounts payable 334,591 251,676 218,849
Industrias CH, S.A.B. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Accounts payable 205,902 204,917  
Transactions of the year (23) 985  
Transfer of accounts receivable for presentation     204,917
Ending Balnce, Accounts payable 205,879 205,902 204,917
Tuberias Procarsa, S.A. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Accounts payable 3,866 3,943  
Transactions of the year (1,924) (77)  
Transfer of loans payable for presentation     3,943
Ending Balnce, Accounts payable 1,942 3,866 3,943
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Accounts payable 2,096 2,122  
Transactions of the year (2,096) (26)  
Transfer of accounts receivable for presentation     2,122
Ending Balnce, Accounts payable 2,096 2,122
Other accounts payable by operation [Member]      
Statement Line Items [Line Items]      
Beginning Balance, Accounts payable 39,812 7,867 7,867
Transactions of the year 86,958 31,945  
Ending Balnce, Accounts payable $ 126,770 $ 39,812 $ 7,867