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Bank loans: (Details Textual) $ in Thousands, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2015 MXN ($) | Nov. 16, 2017 MXN ($) | Nov. 16, 2017 USD ($) | Oct. 31, 2017 MXN ($) | Oct. 19, 2017 MXN ($) | Jul. 31, 2017 USD ($) | Jul. 17, 2015 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Apr. 25, 2018 | Nov. 16, 2017 USD ($) | Oct. 31, 2017 USD ($) | Sep. 20, 2017 | Jul. 17, 2015 USD ($)
Borrowings, interest rate basis |  |  |  |  |  |  |  | London Inter Bank Offered Rate (LIBOR) plus 1.85% |  |  |  |  |  |  |
Closing foreign exchange rate |  |  |  |  |  |  |  |  |  |  | 18.28 |  |  | 19.66 |
Repayments of borrowings, classified as financing activities |  |  |  |  |  |  |  | $ 5,339,338 |  |  |  |  |  |  |
Proceeds from borrowings, classified as financing activities |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  |
BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 2,000,000 |  | $ 4,000.0 |  |  |  |  |  |  | $ 2,000.0 |  |
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 of 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 |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  |  |  | 3.0x |  |  |  |  |  |  |
Banco Santander [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum leverage ratio to be maintained |  |  |  |  |  |  |  | 3.5x |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  |  |  | 3.0x |  |  |  |  |  |  |
Subsidiaries in Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 72,500 |  |  |  |  | $ 3,397,000 |  |  |  |  | $ 1,425.3 |  |  | $ 215.0
Borrowings, interest rate basis |  |  |  |  |  |  | LIBOR plus 1.85% |  |  |  |  |  |  |  |
Closing foreign exchange rate |  | 19.66 |  |  |  |  | 15.80 |  |  |  |  | 19.66 |  |  | 15.80
Borrowings,payment term |  |  |  |  |  |  | July 2018 to July 2022 |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  | $ 1,376,200 | $ 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings,Maturity date |  | Nov. 16, 2022 | Nov. 16, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries in Mexico [Member] | BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  | LIBOR plus a spread of 1.525% | 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% | LIBOR plus a spread of 1.45% |  |  |  |  |  |  |  |  |  |  |  |
Airplan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum equity debt ratio to be maintained |  |  |  |  |  |  |  | equal to or higher than 16% |  |  |  |  |  |  |
Debt coverage ratio |  |  |  |  |  |  |  | 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 | $ 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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