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Cash and cash equivalents: (Details) - MXN ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents [abstract]
Cash and cash held at banks		$ 3,713,072	$ 4,417,791
Short-term investments		841,295	240,701
Fiduciary rights	[1]	30,140	18,962
Cash and cash equivalents		$ 4,584,507	$ 4,677,454	$ 3,497,635	$ 2,084,160
[1] Corresponds to the fiduciary’s agreement 2875 of Airplan, Company’s subsidiary, signed with Fiduciaria Bancolombia to administer the resources of the concession contract. See Notes 8.2 and 18.5.

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- Definition

The amount represents fiduciary rights.

+ References

No definition available.

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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No definition available.

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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard
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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.1)
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