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Summary of the main accounting policies: (Details) |  | 12 Months Ended
--- | --- | ---
Jun. 02, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Aeropuerto de Cancun, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [1],[2] |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary | [1],[2] |  | Airport services |  | Airport services |
Aeropuerto de Cozumel, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Merida, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Huatulco, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Oaxaca, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Veracruz, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Villahermosa, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Tapachula, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Aeropuerto de Minatitlan, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Airport services |  | Airport services |
Cancun Airport Services, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [3] |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary | [3] |  | Airport services |  | Airport services |
RH Asur, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Administrative services |  | Administrative services |
Servicios Aeroportuarios del Sureste, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary |  |  | Administrative services |  | Administrative services |
Asur FBO, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [3] |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary | [3] |  | Administrative services |  | Administrative services |
Caribbean Logistics, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [3] |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary | [3] |  | Cargo services |  | Cargo services |
Cargo RF, S. A. de C. V. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [3] |  | 100.00% |  | 100.00% |
Principal activity of business of subsidiary | [3] |  | Cargo services |  | Cargo services |
Sociedad Operadora de Aeropuertos Centro Norte, S. A. |  |  |  |  |  |
Proportion of ownership interest in subsidiary | [3] |  | 92.42% |  | 92.42% |
Principal activity of business of subsidiary | [3] |  | Airport services |  | Airport services |
Aerostar Airport Holdings, LLC |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 60.00% | 60.00% | [3] | 60.00% | [3]
Principal activity of business of subsidiary | [3] |  | Airport services |  | Airport services |
[1] | Aeropuerto de Cancún, S. A. de C. V. acquired on October 19, 2017 a 92.42% equity interest in Sociedad Operadora de Aeropuertos Centro Norte, S. A. (Airplan), Company that holds the concession for the administration, operation, commercial exploitation, adaptation, modernization and maintenance of the Enrique Olaya Herrera in Medellín, José María Córdoba in Rionegro, El Caraño in Quibdó, Los Garzones in Montería, Antonio Roldán Betancourt in Carepa and Las Brujas in Corozal airports, and from that date Airplan’s results have been incorporated line-by-line in the Company’s and Cancún Aiport’s financial statements.
[2] | Cancún held a 50% stake in Aerostar until May 26, 2017, which was accounted as a joint venture. See Note 9. As of May 26, 2017, the Cancún Airport acquired an additional 10% equity interest in Aerostar. As a result of this acquisition, the Company has a 60% shareholding and now controls Aerostar, therefore Aerostar is consolidated in the Company’s financial statements.
[3] | These subsidiaries sub-consolidate at the Cancún Airport.

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