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Income tax - Analysis of deferred taxes (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Analysis of consolidated deferred taxes              
Net operating loss $ (944) $ (18,642) $ (2,739,691) $ (2,510,333)      
Deferred income tax assets         $ 1,353,184 $ 1,039,851  
Deferred income tax liabilities         2,407,021 2,317,718  
Deferred tax liability, net   (1,277,867) (340,895) (340,895) (1,053,837) (1,277,867) $ (340,895)
Reflected in consolidated statement of financial position              
Deferred tax assets 28,499       562,445 559,083  
Deferred tax liabilities $ (81,901)       (1,616,282) (1,836,950)  
Deferred tax liability, net   (1,277,867) (340,895) (340,895) (1,053,837) (1,277,867) (340,895)
Reconciliation of deferred tax liability, net              
Deferred tax (liability) asset, net - beginning of the year   (1,277,867) (340,895)        
Deferred income tax benefit (expense) during the current year recorded on profits   211,480 (749,696)        
Deferred income benefit (expense) during the current year recorded in accumulated other comprehensive income (loss)   12,550 (187,276) 58,513      
Deferred tax (liability) asset, net - end of the year   (1,053,837) (1,277,867) $ (340,895)      
Deferred tax assets              
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   312,800 46,369        
Intangible              
Analysis of consolidated deferred taxes              
Deferred income tax assets         463,211 481,626  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (18,415) (16,637)        
Provisions              
Analysis of consolidated deferred taxes              
Deferred income tax assets         351,989 343,294  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   8,695 56,727        
Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Deferred income tax assets         343,082 33,324 $ 58,354
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   309,758 (25,030)        
Extension lease agreement              
Analysis of consolidated deferred taxes              
Deferred income tax assets         143,135 101,724  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   41,411 25,405        
Unearned transportation revenue              
Analysis of consolidated deferred taxes              
Deferred income tax assets         35,941 65,755  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (29,814) 7,039        
Allowance for doubtful accounts              
Analysis of consolidated deferred taxes              
Deferred income tax assets         7,324 6,891  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   433 (2,179)        
Employee benefits              
Analysis of consolidated deferred taxes              
Deferred income tax assets         5,786 4,031  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   1,222 886        
Employee profit sharing              
Analysis of consolidated deferred taxes              
Deferred income tax assets         2,716 3,206  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (490) 158        
Deferred tax liabilities              
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (101,320) (796,065)        
Supplemental rent              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         1,563,363 1,339,610  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (223,753) (363,783)        
Rotable spare parts, furniture and equipment, net              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         476,917 368,027  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (108,890) (103,926)        
Prepaid expenses and other assets              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         196,152 435,738  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   239,586 (280,660)        
Inventories              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         88,169 72,883  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (15,286) (23,979)        
Financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         49,151 61,168  
Other prepayments              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         33,269 40,292  
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   7,023 (23,717)        
Costa Rica              
Analysis of consolidated deferred taxes              
Deferred income tax assets         $ 0 $ 0  
Costa Rica | Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Net operating loss   $ 300,613 $ 57,414