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Summary of the main accounting policies: (Details Textual) $ in Thousands, shares in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 26, 2017 | Apr. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 MXN ($) shares | Dec. 31, 2016 MXN ($) shares | Dec. 31, 2015 MXN ($) | Apr. 25, 2018 | Oct. 19, 2017 | Sep. 20, 2017
Applicable tax rate |  |  | 33.00% | 30.00% | 30.00% | 30.00% |  |  |
Termination benefits expense |  |  |  | $ 1,984 | $ 1,237 | $ 1,133 |  |  |
Weighted average number of ordinary shares outstanding | shares |  |  |  | 300 | 300 |  |  |  |
Closing foreign exchange rate |  |  |  |  |  |  | 18.28 |  | 19.66
Gain (loss) that relates to identifiable assets acquired or liabilities assumed in business combination and is of such size, nature or incidence that disclosure is relevant to understanding combined entity's financial statements |  |  |  | $ 7,029,200 |  |  |  |  |
Aeropuerto de Cancún, S. A. de C. V. [Member] |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 50.00% |  | 60.00% |  |  |  |  |
Mexican Peso [Member] |  |  |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 30.00% | 30.00% |  |  |  |
Closing foreign exchange rate |  |  |  | 19.66 | 20.61 |  |  |  |
Colombian pesos [Member] |  |  |  |  |  |  |  |  |
Closing foreign exchange rate |  |  |  | 151.86 |  |  |  |  |
Other property, plant and equipment [member] |  |  |  |  |  |  |  |  |
Useful lives or depreciation rates, property, plant and equipment |  |  |  | 10 |  |  |  |  |
Aerostar [member] |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 10.00% |  |  |  |  |
Percentage of voting equity interests acquired | 10.00% |  |  |  |  |  |  | 92.42% |
Proportion of voting rights held in subsidiary |  |  |  | 60.00% |  |  |  |  |
Gain (loss) that relates to identifiable assets acquired or liabilities assumed in business combination and is of such size, nature or incidence that disclosure is relevant to understanding combined entity's financial statements |  |  |  | $ 7,029,200 |  |  |  |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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