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Nature of operations, Relevant Events (Details) - MXN ($)
$ in Thousands
12 Months Ended
Feb. 14, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Relevant events [Abstract]        
Percentage of remaining capital stock acquired 50.00%      
Percentage of voting interest sold in subsidiaries   100.00%    
Gain on sale of subsidiaries   $ 279,744 $ 111,484 $ (273,032)
Services & Solutions Optimus, S. de R.L. de C.V.        
Relevant events [Abstract]        
Percentage of remaining capital stock acquired 50.00%      
Proportion of ownership interest in subsidiary 100.00%      
Bamorau Servicios, S.A.P.I. de C.V. [Member]        
Relevant events [Abstract]        
Percentage of voting interest sold in subsidiaries   100.00%    
Gain on sale of subsidiaries   $ 24,609    
Snekke, S.A. de C.V. [Member]        
Relevant events [Abstract]        
Percentage of voting interest sold in subsidiaries   100.00%    
Gain on sale of subsidiaries   $ 255,135