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Intangible assets, net (Details)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Composition and movement of intangible assets        
Beginning balance   $ 190,420 $ 114,041 $ 94,649
Additions   71,007 130,908 60,792
Disposals   (9,368) (1,976) (1,277)
Amortization   (72,885) (52,396) (40,290)
Exchange differences   (50) (157) 167
Ending balance $ 9,100 179,124 190,420 114,041
Software        
Composition and movement of intangible assets        
Beginning balance   190,420 114,041  
Ending balance   179,124 190,420 114,041
Amortization expense   72,885 52,396 40,290
Software | Gross value        
Composition and movement of intangible assets        
Beginning balance   441,803 313,028  
Ending balance   503,467 441,803 313,028
Software | Accumulated depreciation / amortization        
Composition and movement of intangible assets        
Beginning balance   (251,383) (198,987)  
Ending balance   $ (324,343) $ (251,383) $ (198,987)
Software | Minimum        
Composition and movement of intangible assets        
Estimated useful lives (in years) 1 year 1 year    
Software | Maximum        
Composition and movement of intangible assets        
Estimated useful lives (in years) 4 years 4 years