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Commitments and contingencies: Investment commitments (Details) $ in Thousands	Dec. 31, 2019 MXN ($)
Disclosure of non-adjusting events after reporting period [line items]
Contractual capital commitments	$ 10,786,214
2020
Disclosure of non-adjusting events after reporting period [line items]
Contractual capital commitments	5,105,804
2021
Disclosure of non-adjusting events after reporting period [line items]
Contractual capital commitments	3,015,346
2022
Disclosure of non-adjusting events after reporting period [line items]
Contractual capital commitments	1,815,769
2023
Disclosure of non-adjusting events after reporting period [line items]
Contractual capital commitments	$ 849,295

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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
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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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- Definition

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+ References

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