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Description of the business and summary of significant accounting policies - Leases (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment charges recorded in respect of right-of-use asset $ 0 $ 0 $ 0
Variable rent $ 680,964 $ 659,106 $ 851,410
Aircraft and engines      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of the assets 18 years    
Spare engines      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of the assets 14 years    
Maintenance component      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of the assets 8 years    
Minimum | Buildings leases      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of the assets 1 year    
Maximum | Buildings leases      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of the assets 10 years