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Long-term debt: Additional information (Details)
$ in Thousands
 12 Months Ended
May 22, 2013
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Jun. 24, 2015
USD ($)
Jun. 24, 2015
MXN ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
MXN ($)
Aerostar                  
Long-term debt:                  
Notional amount               $ 350,000 $ 4,471,000,000
Borrowings, interest rate           6.75% 6.75%    
Aerostar                  
Long-term debt:                  
Proportion of interest in subsidiary   60.00%              
Senior secured notes due on March 22, 2035                  
Long-term debt:                  
Notional amount   $ 400,000 $ 7,011,281,000 $ 400,000 $ 6,843,134,000        
Borrowings, interest rate 5.75%                
Debt Instrument, Quoted Yield 2.39%                
Spread Credit 336                
Senior secured notes due on March 22, 2035 | Aerostar                  
Long-term debt:                  
Notional amount           $ 50,000 $ 737,000,000