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Commitments and contingencies: Additional information (Details) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 21, 2019 MXN ($) | Sep. 20, 2017 USD ($) | Mar. 21, 2015 USD ($) | Mar. 21, 2015 MXN ($) | Dec. 31, 2020 USD ($) room | Dec. 31, 2020 MXN ($) room | Dec. 31, 2019 USD ($) D | Dec. 31, 2019 MXN ($) D | Dec. 31, 2018 MXN ($) | Sep. 30, 2020 MXN ($) | Aug. 19, 2020 MXN ($)
Commitments and contingencies: |  |  |  |  |  |  |  |  |  |  |
Contingent rents recognised as expense |  |  | $ 23,550 | $ 469 |  |  |  |  |  |  |
Leasing |  |  |  |  |  | $ 6,304 |  | $ 5,232 |  |  |
Number of hotel rooms | room |  |  |  |  | 450 | 450 |  |  |  |  |
Service expenses |  | $ 29,700,000 |  |  |  | $ 275,206 |  | 325,613 | $ 310,065 |  |
Insurance revenue |  |  |  |  | $ 7,300,000 | 158,906 | $ 15,700,000 | 289,822 |  |  |
Other income |  |  |  |  |  | 158,881 |  | 204,719 | $ 134,637 |  |
Restricted cash and cash equivalents |  |  |  |  |  | $ 5,055 |  | $ 165,622 |  |  |
Number of days extension for concession contracts | D |  |  |  |  |  |  | 541 | 541 |  |  |
Percentage of amortization of concessionaries per year |  |  |  |  | 15.00% | 15.00% |  |  |  |  |
Estimated financial effect | $ 73,000 |  |  |  |  |  |  |  |  |  |
Deferment investments |  |  |  |  |  |  |  |  |  | $ 2,292,355 | $ 2,292,355
Maximum |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies: |  |  |  |  |  |  |  |  |  |  |
Period that Amparo proceedings will resolve | 2 years |  |  |  |  |  |  |  |  |  |
Aeropuerto de Cancun |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies: |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect |  |  |  |  |  | $ 865,000 |  |  |  |  |
Aeropuerto de Cancun | Legal proceedings contingent liability |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies: |  |  |  |  |  |  |  |  |  |  |
Legal proceedings provision |  |  |  |  |  | $ 116,000 |  |  |  |  |

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