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Intangible assets, airport concessions - Net: (Details Textual) $ in Thousands, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Apr. 25, 2018 | Dec. 31, 2017 USD ($) | Sep. 20, 2017
Acquisitions through business combinations, intangible assets and goodwill |  |  |  |  |  |
Closing foreign exchange rate |  |  |  | 18.28 |  | 19.66
Impairment loss recognised in profit or loss, goodwill | 4,719,096 |  |  |  |  |
Aerostar segment [Member] |  |  |  |  |  |
Amortisation expense | $ 422,305 |  |  |  |  |
Explanation of value assigned to key assumption | If the discount rate applied to the cash flow projections of this CGU would have been + 1% or -1%, Management's estimate would have to recognize the following additional effects of Ps.1,525,824 (11.93% instead of 10.93%), and in the case of the decrease in the rate (Ps.1,827,599) lower than the amount recognized as impairment (9.93% instead of 10.93%), in the latter case the Company would not have to recognize any impairment.. |  |  |  |  |
Percentage of rental expense on gross income | 5.00% |  |  |  |  |
Concession period for operating rights | 40 years |  |  |  |  |
Description of concession agreement | The Agreement requires Aerostar to make a cash payment of USD2.5 million (Ps.49.15 million at an exchange rate of Ps.19.66) per year for the first five years after the first five years, the authority establishes a payment of "Annual Authority Income Share", consisting of 5 % of the gross revenues of the airport obtained by Aerostar from the sixth year to the thirtieth year. From year 31 to 40, this amount will increase to 10% of the airport's gross revenues. |  |  |  |  |
Annual contributions to be collected | $ 49,150 |  |  |  | $ 2.5 |
Closing foreign exchange rate | 19.66 |  |  |  | 19.66 |
Explanation of period over which management has projected cash flows | 36 |  |  |  |  |
Airplan segment [Member] |  |  |  |  |  |
Amortisation expense | $ 54,823 |  |  |  |  |
Explanation of value assigned to key assumption | If the discount rate applied to the cash flow projections of this CGU would have been + 1% or -1%, the Administration's estimate would have the following effects (11.07% instead of 10.07%), and in this case the excess of the fair value in relation to its book value would be shortened by Ps.394, and in the case of a decrease in the rate the excess would be increased by Ps.430 (9.07% instead of 10.07%), in none of the cases would there be any effects for deterioration. |  |  |  |  |
Explanation of period over which management has projected cash flows | 15 |  |  |  |  |
Aeroplan segment [Member] |  |  |  |  |  |
Period elapsed from date of execution of certificate of commencement of execution | 15 years |  |  |  |  |
Period elapsed from date of execution start certificate inspite regulated revenue not matched with value of expected regulated revenue | 25 years |  |  |  |  |
Expected regulated income adjusted for complementary works | $ 14,294,642 |  |  |  |  |
Percent of obligation to pay consideration on gross income | 19.00% |  |  |  |  |
Concessions [member] |  |  |  |  |  |
Amortisation expense | $ 1,130,481 | 463,464 | 524,297 |  |  |
Licences and franchises [member] |  |  |  |  |  |
Amortisation expense | $ 12,730 | $ 10,581 | $ 12,554 |  |  |

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