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Cash and cash equivalents: (Tables)
 12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
Disclosure of detailed information about cash and cash equivalents [text block]
 
 
December 31,
 
 
 
 
 
 
 
 
 
 
 
2016
 
2017
 
 
 
 
 
 
 
 
 
Cash and cash held at banks
 
Ps
3,142,810
 
Ps
4,417,791
 
Short term investments
 
 
354,825
 
 
240,701
 
Fiduciary rights (*)
 
 
 
 
 
18,962
 
 
 
 
 
 
 
 
 
Total cash and cash equivalents
 
Ps
3,497,635
 
Ps
4,677,454
 
 
(*)       Corresponds to the Airplan Fiduciary's agreement 2875, signed with Fiduciaria Bancolombia to administer the resources of the concession contract. See Notes 8.2 and 18.5.