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Bank loans: (Details)
$ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
COP ($)
Dec. 31, 2016
USD ($)
Credit line used $ 14,493,049 $ 4,433,170     $ 215,000
Principle amortization 4,000,000      
Commissions and interest - Net 1,804 27,606      
Short Term 173,471 58,336      
Long Term 7,149,177      
Fair value 10,791,338 4,765,630      
Airplan [Member]          
Credit line used 3,641,929     $ 440,000,000  
Commissions and interest - Net (8,925)        
Short Term 144,289        
Long Term 3,488,715        
Fair value 3,534,614        
BBVA Bancomer, S. A. [member]          
Credit line used   2,216,585     107,500
Principle amortization        
Commissions and interest - Net   13,803      
Short Term   29,168      
Long Term   2,201,220      
Fair value   2,387,179      
Bank of America Merrill Lynch [member]          
Credit line used 1,425,560 2,216,585 $ 72,500   $ 107,500
Principle amortization        
Commissions and interest - Net 3,215 13,803      
Short Term 5,675 29,168      
Long Term 1,423,100 2,201,220      
Fair value 1,535,374 $ 2,378,451      
Loan one from BBVA Bancomer [Member]          
Credit line used 2,000,000        
Commissions and interest - Net 14,875        
Short Term 14,875        
Long Term 2,000,000        
Fair value 2,089,786        
Loan two from BBVA Bancomer [Member]          
Credit line used 4,000,000        
Principle amortization 4,000,000        
Santander [Member]          
Credit line used 2,000,000        
Commissions and interest - Net (10,576)        
Short Term 2,957        
Long Term 1,986,467        
Fair value 2,091,065        
Loan three from BBVA Bancomer [Member]          
Credit line used 1,425,560   $ 72,500    
Commissions and interest - Net 3,215        
Short Term 5,675        
Long Term 1,423,100        
Fair value 1,540,499        
Bancolombia [Member]          
Credit line used 1,295,381     150,000,000  
Commissions and interest - Net (2,595)        
Short Term 103,100        
Long Term 1,189,686        
Fair value 1,204,983        
CorpBanca [Member]          
Credit line used 718,021     102,000,000  
Commissions and interest - Net (633)        
Short Term 2,840        
Long Term 810,284        
Fair value 819,389        
Banco Davivienda [Member]          
Credit line used 328,112     90,000,000  
Commissions and interest - Net (1,159)        
Short Term 2,488        
Long Term 292,905        
Fair value 722,990        
Banco de Occidente [Member]          
Credit line used 295,186     37,000,000  
Commissions and interest - Net (1,258)        
Short Term 1,031        
Long Term 292,898        
Fair value 297,229        
Banco Popular [Member]          
Credit line used 63,824     8,000,000  
Commissions and interest - Net (941)        
Short Term 369        
Long Term 62,514        
Fair value 64,266        
Banco AV Villas [Member]          
Credit line used 63,824     8,000,000  
Commissions and interest - Net (49)        
Short Term 223        
Long Term 63,552        
Fair value 64,266        
Serfinansa [Member]          
Credit line used 63,824     8,000,000  
Commissions and interest - Net (1,243)        
Short Term 79        
Long Term 62,502        
Fair value 64,266        
Loan from Banco Bogota [Member] | Airplan [Member]          
Credit line used 813,757     $ 37,000,000  
Commissions and interest - Net (1,047)        
Short Term 34,159        
Long Term 714,374        
Fair value $ 297,229