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Accrued liabilities - Other liabilities (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of accrued liabilities    
Balance at beginning of the year $ 420,755 $ 159,499
Increase for the year 968,890 1,048,731
Payments 869,633 774,468
Unwinding discount 22,566 13,007
Balance at end of the year 497,446 420,755
Aircraft lease return obligation    
Analysis of accrued liabilities    
Balance at beginning of the year 410,060 149,326
Increase for the year 960,548 1,038,764
Payments 859,659 765,023
Unwinding discount 22,566 13,007
Balance at end of the year 488,383 410,060
Employee profit sharing    
Analysis of accrued liabilities    
Balance at beginning of the year 10,695 10,173
Increase for the year 8,342 9,967
Payments 9,974 9,445
Balance at end of the year $ 9,063 $ 10,695