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Bank loans: Additional information (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2020 USD ($) | Sep. 11, 2020 COP ($) | Jun. 29, 2020 MXN ($) | Oct. 19, 2017 MXN ($) | Jun. 02, 2015 COP ($) | Jun. 02, 2015 MXN ($) | Oct. 31, 2017 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 COP ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 30, 2020 MXN ($) | Sep. 11, 2020 MXN ($) | Apr. 01, 2020 | Dec. 18, 2015 USD ($) | Dec. 18, 2015 MXN ($)
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement, liabilities |  |  |  | $ 605,382 |  |  |  |  | $ 535,125,402 | $ 3,408,442 |  |  |  |  |  |
Bank loans paid |  |  |  |  | $ 440,000,000,000 | $ 2,897,404 |  | $ 243,998 |  | $ 152,047 | $ 3,090,124 |  |  |  |  |
Proceeds from borrowings, classified as financing activities |  |  |  |  |  |  |  | $ 306,241 |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 1.25% | 1.25% | 1.25% |  |  |  |  |  |
Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
Colombia (Airplan) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, Term |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
BBVA Bancomer, S. A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans paid |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  | 28-Day Interbank Equilibrium Interest Rate (28 Day TIIE) |  |  |  |  | TIIE rate of 28 days plus 1.25 points. |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Santandar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Bancolombia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 11,612,000 |  |  |  |  |  |  |  |  |  |  | $ 67,041 |  |  |
Borrowings, interest rate basis |  | DTF rate plus |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  | 1.70% |  |  |  |  |  |  |  |  |  |  | 1.70% |  |  |
Borrowings, interest rate |  | 4.43% |  |  |  |  |  |  |  |  |  |  | 4.43% |  |  |
Banco Popular De Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 20,000 |  |  |  |  |  |  |  |  |  |  | $ 399,010 |  |  | $ 10,000 | $ 239,200
Borrowings, adjustment to interest rate basis | 0.50% |  |  |  |  |  |  |  |  |  |  | 0.50% |  | 0.50% |  |
Borrowings, Term | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused credit line (in percent) | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banco Popular De Puerto Rico | Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, Term |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |

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