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Financial risk management: Additional information (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue From Regulated Services |  |
Borrowings, adjustment to interest rate basis | 1.25% | 1.25%
Closing foreign exchange rate | 19.65 | 18.86
Foreign exchange gain (loss) | $ 150,400 | $ 41,100
Receivables due from related parties | 284 | $ 809
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets | $ 128,000 |
Percentage of increase decrease in foreign exchange rate | 5.00% | 5.00%
Cancun Airport Services, S. A. de C. V. |  |
Revenue From Regulated Services |  |
Percentage of entity's revenue | 55.02% | 51.07%
Grupo Mexicana |  |
Revenue From Regulated Services |  |
Receivables due from related parties | $ 128,000 |

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