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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
 1 Months Ended 12 Months Ended
Aug. 31, 2015
aircraft
Dec. 31, 2017
MXN ($)
agreement
aircraft
Dec. 31, 2016
MXN ($)
aircraft
Dec. 31, 2015
MXN ($)
aircraft
Aircraft, rotable spare parts, furniture and equipment, net        
Maintenance deposits expensed as supplemental rent   $ 103,648 $ 143,923 $ 73,258
Number of aircraft added to fleet | aircraft   5 17 7
Maintenance adjustment payments expensed as contingent rent   $ 162,108 $ 201,434 $ 290,857
Number of aircraft with lease term extended | aircraft 3 3 2  
Number of engine agreements for which lease term extended | agreement   2    
Maintenance deposits expensed to contingent rent prior to lease extensions   $ 65,716 $ 92,528  
Amortization of lease incentives   $ 88,224 74,748 45,313
Length of time before routine aircraft and engine maintenance is required   22 months    
Additions   $ 2,584,232 2,198,697  
Depreciation   496,291 496,253 425,439
Capitalized borrowing costs   $ 193,389 $ 95,445 $ 90,057
Rate used to determine amount of borrowing cost   3.30% 2.88% 2.80%
Impairment charges on rotable spare parts, furniture and equipment   $ 0 $ 0 $ 0
Aircraft parts and rotable spare parts        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   115,173 110,592  
Depreciation   44,409 33,430  
Aircraft spare engines        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   385 323,025  
Depreciation   16,795 1,337  
Standardization        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   15,833 21,953  
Depreciation   $ 18,543 23,728  
Annual depreciation rate   Remaining contractual lease term    
Computer equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   $ 1,845 740  
Depreciation   $ 3,809 2,549  
Annual depreciation rate   25.00%    
Communications equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions     129  
Depreciation   $ 796 831  
Annual depreciation rate   10.00%    
Office furniture and equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   $ 6,805 517  
Depreciation   $ 3,801 3,559  
Annual depreciation rate   10.00%    
Electric power equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions     1,467  
Depreciation   $ 1,294 1,946  
Annual depreciation rate   10.00%    
Workshop machinery and equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   $ 123 131  
Depreciation   $ 722 692  
Annual depreciation rate   10.00%    
Service carts on board        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions     36  
Depreciation   $ 376 731  
Annual depreciation rate   20.00%    
Leasehold improvements to flight equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   $ 529,331 226,526  
Depreciation   $ 382,745 $ 404,659 $ 352,932
Annual depreciation rate   The shorter of: (i) remaining contractual lease term, or (ii) the next major maintenance event    
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%