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Bank loans: (Details Textual) $ in Thousands, $ in Thousands, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 02, 2015 MXN ($) | Jun. 02, 2015 COP ($) | Nov. 22, 2018 MXN ($) | Nov. 16, 2018 USD ($) | May 16, 2018 MXN ($) | May 16, 2018 USD ($) | Nov. 16, 2017 USD ($) | Oct. 31, 2017 MXN ($) | Oct. 19, 2017 MXN ($) | Jul. 31, 2017 MXN ($) | Jul. 17, 2015 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 COP ($) | Dec. 31, 2017 MXN ($)
Borrowings, interest rate basis |  |  |  |  |  |  |  |  |  |  |  | London Inter Bank Offered Rate (LIBOR) plus 1.85%) | London Inter Bank Offered Rate (LIBOR) plus 1.85%) |
Increase (decrease) in fair value measurement, liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ 535,125,402 |
Repayments of borrowings, classified as financing activities | $ 2,897,404 | $ 440 |  |  |  |  |  |  |  |  |  | $ 3,090,124 |  | $ 5,339,338
Proceeds from borrowings, classified as financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000
Purchase of property, plant and equipment, classified as investing activities |  |  | $ 1,478,848 | $ 72,500 | $ 1,415,301 | $ 72,500 |  |  |  |  |  |  |  |
BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 2,000,000 |  | $ 4,000,000 |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  |  | 28-day TIIE plus 1.25 points |  | The loan was denominated in pesos and subject to the monthly rate TIIE plus 0.60% for the period from July 31 to October 31, 2017, TIIE plus 0.85% from October 31, 2017, to January 31, 2018, TIIE plus 1.10% from January 31 to April 30, 2018, and TIIE plus 1.60% from April 30 to July 31, 2018 |  |  |  |
Borrowings,payment term |  |  |  |  |  |  |  | The new loan is payable in seven years and will be paid in nine semiannual payments from October 2020 to October 2024 at the rate of 28-day TIIE plus 1.25 points. |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |
Borrowings,Maturity date |  |  |  |  |  |  |  | Oct. 27, 2022 |  |  |  |  |  |
Minimum leverage ratio to be maintained |  |  |  |  |  |  |  |  |  |  |  | 3.5x | 3.5x |
Minimum interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 3.0x | 3.0x |
Banco Santander [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |
Minimum leverage ratio to be maintained |  |  |  |  |  |  |  |  |  |  |  | 3.5x | 3.5x |
Minimum interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 3.0x | 3.0x |
Subsidiaries in Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 72,500 |  |  |  | $ 215,000 |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  |  |  |  |  | LIBOR plus 1.85% |  |  |
Borrowings,payment term |  |  |  |  |  |  |  |  |  |  | July 2018 to July 2022 |  |  |
Repayments of borrowings, classified as financing activities |  |  |  |  |  |  | $ 70,000 |  |  |  |  |  |  |
Borrowings,Maturity date |  |  |  |  |  |  | Nov. 16, 2023 |  |  |  |  |  |  |
Subsidiaries in Mexico [Member] | BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  | LIBOR plus a spread of 1.525% |  |  |  |  |  |  |
Subsidiaries in Mexico [Member] | BankofAmericaMerrill Lynch [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  | LIBOR plus a spread of 1.45% |  |  |  |  |  |  |
Airplan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum equity debt ratio to be maintained |  |  |  |  |  |  |  |  |  |  |  | equal to or higher than 16% | equal to or higher than 16% |
Debt coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 2: 1.2 | 2: 1.2 |
Syndicated Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement, liabilities |  |  |  |  |  |  |  |  | $ 605,382 |  |  |  |  |
Long-term syndicated loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings, classified as financing activities |  | $ 440 |  |  |  |  |  |  |  |  |  |  |  |

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