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Share-based payments - Vesting schedule of SARs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 MXN ($) EquityInstruments	Dec. 31, 2017 MXN ($) EquityInstruments	Dec. 31, 2016 MXN ($) EquityInstruments
Share-based payments
Forfeited during the year	121,451
SARs - cash settled
Share-based payments
Shares outstanding	2,106,586
Forfeited during the year	484,656	145,769	0
Cash payment related to key employees related to SARs plan | $	$ 0	$ 6,021	$ 31,261
Vesting / Exercisable within one year | SARs - cash settled
Share-based payments
Shares outstanding	1,348,777
Vesting / Exercisable within two years | SARs - cash settled
Share-based payments
Shares outstanding	757,809

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard
-URIDate 2018-03-16

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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of cash payment to key employees related to SARs plan.

+ References

No definition available.

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