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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Interest to be Recognized) (Details) - MXN ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |
Recognized Interest |  | $ 198,053 | $ 31,882
Corresponding income tax |  | (24,949) | (10,353)
Additional profit recognized in the financial statements |  | $ 173,104 | $ 21,529
Earnings per share | $ 7.46 | $ 3.84 | $ 5.97
Before correction [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Earnings per share |  | 3.49 | 5.93
After correction [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Earnings per share |  | $ 3.84 | $ 5.97
Perfiles Comerciales Sigosa, S.A. de C.V. [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Interest income |  |  | $ 705,064
Recognized Interest |  | $ 60,383 | 24,632
Proyectos Comercializadora el Ninzi, S.A. de C.V. [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Interest income |  |  | 1,571,048
Recognized Interest |  | 124,873 | 1,467
Industrias CH, S.A.B. de C.V. [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Interest income |  |  | 88,433
Recognized Interest |  | $ 12,797 | $ 5,783

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