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Description of the business and summary of significant accounting policies - Aircraft, rotable spare parts, furniture and equipment, net (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
agreement
Dec. 31, 2018
engine
Dec. 31, 2018
aircraft
Dec. 31, 2018
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
agreement
Dec. 31, 2017
engine
Dec. 31, 2017
aircraft
Dec. 31, 2017
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
agreement
Dec. 31, 2016
aircraft
Dec. 31, 2016
Dec. 31, 2016
MXN ($)
Aircraft, rotable spare parts, furniture and equipment, net                              
Maintenance deposits expensed as supplemental rent           $ 87,019         $ 103,648       $ 143,923
Number of aircraft added to fleet | aircraft       10         5       17    
Maintenance adjustment payments expensed as contingent rent           212,582         162,108       201,434
Number of aircraft with lease term extended   2   2     3   3     2 2    
Number of engine agreements for which lease term extended | engine     2         2              
Maintenance deposits expensed to contingent rent prior to lease extensions           0         65,716       92,528
Amortization of lease incentives           84,637         88,224       74,748
Length of time before routine aircraft and engine maintenance is required 22 months                            
Additions           2,693,397         2,584,232       2,198,697
Depreciation           427,756         496,291       496,253
Capitalized borrowing costs           357,920         193,389       95,445
Rate used to determine amount of borrowing cost         4.41%         3.30%       2.88%  
Aircraft parts and rotable spare parts                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           106,240         115,173       110,592
Depreciation           54,320         44,409       33,430
Aircraft spare engines                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           260,131         385       323,025
Depreciation           16,785         16,795       1,337
Standardization                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           10,803         15,833       21,953
Depreciation           13,729         18,543       23,728
Annual depreciation rate Remaining contractual lease term                            
Computer equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           5,316         1,845       740
Depreciation           7,215         3,809       2,549
Annual depreciation rate         25.00%                    
Communications equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           1,050                 129
Depreciation           892         796       831
Annual depreciation rate         10.00%                    
Office furniture and equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           652         6,805       517
Depreciation           6,209         3,801       3,559
Annual depreciation rate         10.00%                    
Electric power equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions                             1,467
Depreciation           1,132         1,294       1,946
Annual depreciation rate         10.00%                    
Workshop machinery and equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           1,040         123       131
Depreciation           727         722       692
Annual depreciation rate         10.00%                    
Service carts on board                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions                             36
Depreciation           256         376       731
Annual depreciation rate         20.00%                    
Leasehold improvements to flight equipment                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Additions           676,457         529,331       226,526
Depreciation           313,464         382,745       404,659
Annual depreciation rate The shorter of: (i) remaining contractual lease term, or (ii) the next major maintenance event                            
Rotable spare parts, furniture and equipment assets                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Impairment charges on rotable spare parts, furniture and equipment           $ 0         $ 0       $ 0
Minimum                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Duration of routine aircraft and engine maintenance 7 days                            
Length of time before major aircraft and engine maintenance is required 5 years                            
Minimum | Aircraft parts and rotable spare parts                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Annual depreciation rate         8.30%                    
Minimum | Aircraft spare engines                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Annual depreciation rate         4.00%                    
Maximum                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Duration of routine aircraft and engine maintenance 14 days                            
Duration of major aircraft and engine maintenance 42 days                            
Length of time before major aircraft and engine maintenance is required 6 years                            
Maximum | Aircraft parts and rotable spare parts                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Annual depreciation rate         16.70%                    
Maximum | Aircraft spare engines                              
Aircraft, rotable spare parts, furniture and equipment, net                              
Annual depreciation rate         8.30%