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Income tax - Analysis of deferred taxes (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Analysis of consolidated deferred taxes              
Net operating loss $ 44,735 $ 880,530 $ 38,547 $ (2,698,800)      
Deferred income tax assets         $ 2,029,811 $ 1,304,033 $ 978,683
Deferred income tax liabilities         2,531,961 2,357,870 2,256,550
Deferred tax liability, net   (1,053,837) (1,277,867) (340,895) (502,150) (1,053,837) (1,277,867)
Reflected in consolidated statement of financial position              
Deferred tax assets 30,143       593,302 562,445 559,083
Deferred tax liabilities $ (55,655)       (1,095,452) (1,616,282) (1,836,950)
Deferred tax liability, net   (1,053,837) (1,277,867) (340,895) (502,150) (1,053,837) (1,277,867)
Reconciliation of deferred tax liability, net              
Deferred tax (liability) asset, net - beginning of the year   (1,053,837) (1,277,867) (340,895)      
Deferred income tax benefit (expense) during the current year recorded on profits   468,377 211,480 (749,696)      
Deferred income benefit (expense) during the current year recorded in accumulated other comprehensive income (loss)   83,310 12,550 (187,276)      
Deferred tax (liability) asset, net - end of the year   (502,150) (1,053,837) (1,277,867)      
Deferred tax assets              
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   642,468 312,800 46,369      
Intangible              
Analysis of consolidated deferred taxes              
Deferred income tax assets         460,590 463,211 481,626
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (2,621) (18,415) (16,637)      
Provisions              
Analysis of consolidated deferred taxes              
Deferred income tax assets         324,445 351,989 343,294
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (27,544) 8,695 56,727      
Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Deferred income tax assets         309,320 343,082 33,324
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (33,762) 309,758 (25,030)      
Extension lease agreement              
Analysis of consolidated deferred taxes              
Deferred income tax assets         149,305 143,135 101,724
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   6,170 41,411 25,405      
Unearned transportation revenue              
Analysis of consolidated deferred taxes              
Deferred income tax assets         735,355 35,941 65,755
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   699,414 (29,814) 7,039      
Allowance for doubtful accounts              
Analysis of consolidated deferred taxes              
Deferred income tax assets         4,902 7,324 6,891
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (2,422) 433 (2,179)      
Employee benefits              
Analysis of consolidated deferred taxes              
Deferred income tax assets         5,446 5,786 4,031
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   1,456 1,222 886      
Employee profit sharing              
Analysis of consolidated deferred taxes              
Deferred income tax assets         4,493 2,716 3,206
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   1,777 (490) 158      
Financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax assets         35,955    
Deferred income tax liabilities           49,151 61,168
Deferred tax liabilities              
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (174,091) 101,320 (796,065)      
Supplemental rent              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         1,595,519 1,563,363 1,339,610
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (32,156) 223,753 (363,783)      
Rotable spare parts, furniture and equipment, net              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         645,024 476,917 368,027
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (168,107) 108,890 (103,926)      
Prepaid expenses and other assets              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         170,466 196,152 435,738
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   25,686 (239,586) (280,660)      
Inventories              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         88,895 88,169 72,883
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   (726) 15,286 (23,979)      
Other prepayments              
Analysis of consolidated deferred taxes              
Deferred income tax liabilities         32,057 33,269 40,292
Reconciliation of deferred tax liability, net              
Deferred income tax benefit (expense) during the current year recorded on profits   1,212 (7,023) (23,717)      
Costa Rica              
Analysis of consolidated deferred taxes              
Deferred income tax assets         $ 0 $ 0 $ 0
Costa Rica | Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Net operating loss   $ 170,731 $ 300,613 $ 57,414