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Intangible assets, net (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Composition and movement of intangible assets        
Beginning balance   $ 179,124 $ 190,420 $ 114,041
Additions   77,325 71,007 130,908
Disposals     (9,368) (1,976)
Amortization   (87,667) (72,885) (52,396)
Exchange differences   (1,385) (50) (157)
Ending balance $ 8,883 167,397 179,124 190,420
Software        
Composition and movement of intangible assets        
Beginning balance   179,124 190,420  
Ending balance   167,397 179,124 190,420
Amortization expense   87,667 72,885 52,396
Software | Gross value        
Composition and movement of intangible assets        
Beginning balance   503,467 441,803  
Ending balance   579,360 503,467 441,803
Software | Accumulated depreciation / amortization        
Composition and movement of intangible assets        
Beginning balance   (324,343) (251,383)  
Ending balance   $ (411,963) $ (324,343) $ (251,383)
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