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Critical accounting judgments and key sources of estimation uncertainty: (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Ifrs Statement [Line Items]    
Expected Revenue From Airplan $ 17,540,245 $ 19,217,035
Original concession period for operating rights 50 years  
Airplan    
Ifrs Statement [Line Items]    
Original concession period for operating rights 40 years  
Minimum | Airplan    
Ifrs Statement [Line Items]    
Original concession period for operating rights 24 years