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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Balances of Related Parties) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non current assets      
Accounts receivable: $ 648,281 $ 648,281 $ 648,239
Long-term loans:      
Long-term loans:   3,032,599 2,364,545
Accounts payable (Adjustment):      
Accounts payable   (211,915) (210,982)
Loans (Adjustment):      
Loans (Adjustment):   3,816 2,508
Transfer of current liabilities:      
Accounts receivable   (329,521) (329,134)
Loans   (2,913,325) (2,443,294)
Recorded interest   (229,935) (31,882)
Industrias CH, S.A.B. de C.V. [Member]      
Non current assets      
Accounts receivable:   648,281 648,239
Long-term loans:      
Long-term loans: $ 730,278 530,281 88,433
Accounts payable (Adjustment):      
Accounts payable   (205,902) (204,917)
Loans (Adjustment):      
Loans (Adjustment):     (998)
Perfiles Comerciales Sigosa, S.A. de C.V. [Member]      
Long-term loans:      
Long-term loans:   806,397 705,064
Accounts payable (Adjustment):      
Accounts payable   (2,096) (2,122)
Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member]      
Long-term loans:      
Long-term loans:   1,695,921 1,571,048
Tuberias Procarsa, S.A. de C.V. [Member]      
Accounts payable (Adjustment):      
Accounts payable   (3,866) (3,943)
Loans (Adjustment):      
Loans (Adjustment):   3,866 3,943
Accounts payable other [Member]      
Accounts payable (Adjustment):      
Accounts payable   (51)  
Pytsa Industrial, S.A. de C.V. [Member]      
Loans (Adjustment):      
Loans (Adjustment):   $ (50) $ (437)