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Long-term debt: Additional information (Details) $ in Thousands | May 26, 2017 | May 25, 2017 | May 22, 2013 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Jun. 24, 2015 USD ($) | Jun. 24, 2015 MXN ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 MXN ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aerostar |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 50.00% |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 350,000 | $ 4,471,000,000
Borrowings, interest rate |  |  |  |  |  |  |  | 6.75% | 6.75% |  |
Aerostar |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |
Proportion of interest in subsidiary | 60.00% |  |  |  |  |  |  |  |  |  |
Senior secured notes due on March 22, 2035 |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 400,000 | $ 7,333,536,000 | $ 400,000 | $ 6,843,134,000 | $ 50,000 |  |  |
Borrowings, interest rate |  |  | 5.75% |  |  |  |  |  |  |  |
Debt Instrument, Quoted Yield |  |  | 2.39% |  |  |  |  |  |  |  |
Spread Credit |  |  | 336 |  |  |  |  |  |  |  |
Senior secured notes due on March 22, 2035 | Aerostar |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 737,000,000 |  |

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