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Commitments and contingencies: (Details 1) $ in Thousands | Dec. 31, 2017 MXN ($)
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Two thousand eighteen [member] |  |
Contractual capital commitments | $ 340,645 | [1]
[1] | Figures in pesos adjusted to December 31, 2017, based on the National Construction Price Index (IPCO, by its acronym in Spanish) in accordance with the terms of the MDP.

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |