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Commitments and contingencies: (Details 1) $ in Thousands	Dec. 31, 2018 MXN ($)
Contractual capital commitments	$ 12,966,408	[1]
Two Thousand Ninteen [Member]
Contractual capital commitments	2,173,764
Two Thousand Twenty [Member]
Contractual capital commitments	5,108,847
Two Thousand twenty One [Member]
Contractual capital commitments	3,017,146
Two Thousand twenty two [Member]
Contractual capital commitments	1,816,852
Two Thousand twenty three [Member]
Contractual capital commitments	$ 849,799
[1] Figures in thousand pesos adjusted at December 31, 2018 based on the Construction Price Index (IPCO) in the terms of the PMD.

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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
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