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Income tax incurred and deferred: (Details 4) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Beginning Balances | $ 3,033,930 |  | $ 1,870,660 | $ 1,523,722
Proceeds from asset tax recovery |  |  | 152,785 | 34,090
Tax charged or credited in the comprehesive income statement |  |  |  | (101,792)
Increase (decrease) in deferred tax liability (asset) | 49,976 |  | (292,750) | (67,702)
Ending Balances | 3,081,668 |  | 3,033,930 | 1,870,660
Airplan [Member] |  |  |  |
Proceeds from asset tax recovery |  |  | 579,585 |
Increase (decrease) in deferred tax liability (asset) | 2,981 |  | (9,337) |
Identifiable assets acquired (liabilities assumed) |  |  | 281,899 |
Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income |  | $ (2,238) | 12,380 |
Aerostar [Member] |  |  |  |
Proceeds from asset tax recovery |  |  | 203,512 |
Increase (decrease) in deferred tax liability (asset) | 33,879 |  | 28,678 |
Initial valuation of Investments |  |  | 605,382 |
Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income |  |  | 35,117 |
Mexico City [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | 13,116 |  | (312,091) |
Provision for load portfolio impairment |  |  |  |
Beginning Balances | (36,874) |  | (33,930) | (31,576)
Tax charged or credited in the comprehesive income statement |  |  |  | (2,354)
Increase (decrease) in deferred tax liability (asset) | 8,042 |  | (10,986) | (2,354)
Ending Balances |  |  | (36,874) | (33,930)
Provision for load portfolio impairment | Airplan [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | (2,468) |  |  |
Provision for load portfolio impairment | Mexico City [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | 10,510 |  | (10,986) |
Concessioned assets |  |  |  |
Beginning Balances | 2,858,318 |  | 1,447,089 | 1,766,981
Tax charged or credited in the comprehesive income statement |  |  |  | (94,340)
Increase (decrease) in deferred tax liability (asset) | 221,431 |  | (261,412) | (94,340)
Ending Balances |  |  | 2,858,318 | 1,447,089
Concessioned assets | Airplan [Member] |  |  |  |
Proceeds from asset tax recovery |  |  | 356,296 |
Increase (decrease) in deferred tax liability (asset) | 178,236 |  | (6,191) |
Identifiable assets acquired (liabilities assumed) |  |  | 281,899 |
Concessioned assets | Aerostar [Member] |  |  |  |
Proceeds from asset tax recovery |  |  | 203,512 |
Increase (decrease) in deferred tax liability (asset) | 35,440 |  | 28,678 |
Initial valuation of Investments |  |  | 605,382 |
Concessioned assets | Mexico City [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | 7,755 |  | (283,899) |
Recoverable asset tax |  |  |  |
Beginning Balances | 0 |  | (152,785) | (186,875)
Proceeds from asset tax recovery |  |  | 152,785 | 34,090
Increase (decrease) in deferred tax liability (asset) | 0 |  | 0 | 34,090
Ending Balances |  |  | 0 | (152,785)
Recoverable asset tax | Mexico City [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | 0 |  | 0 |
Foreign currency translarion |  |  |  |
Beginning Balances | 60,008 |  | 42,575 |
Increase (decrease) in deferred tax liability (asset) | (2,994) |  |  |
Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income | 20,427 |  | 7,458 |
Ending Balances |  |  | 60,008 | 42,575
Foreign currency translarion | Airplan [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | (1,433) |  |  |
Foreign currency translarion | Aerostar [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | (1,561) |  |  |
Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income |  |  | 35,117 |
Other |  |  |  |
Beginning Balances | 177,953 |  | (29,906) | (24,808)
Tax charged or credited in the comprehesive income statement |  |  |  | (5,098)
Increase (decrease) in deferred tax liability (asset) | (176,503) |  | (20,352) | (5,098)
Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income |  |  | (22,665) | 4,922
Ending Balances |  |  | 177,953 | $ (29,906)
Other | Airplan [Member] |  |  |  |
Proceeds from asset tax recovery |  |  | 223,289 |
Increase (decrease) in deferred tax liability (asset) | (171,354) |  | (3,146) |
Other | Mexico City [Member] |  |  |  |
Increase (decrease) in deferred tax liability (asset) | $ (5,149) |  | $ (17,206) |

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