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Income tax - Analysis of deferred taxes (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
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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 |  |  |  |

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