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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