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Stockholders' equity (Narrative) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |
Percentage of legal reserve | 5.00% |
Legal reserve amount | $ 484,046 | $ 484,046
Percentage of nominal capital | 20.00% |
Reserve | $ 3,000,000 |
Increase reserve amount | 5,000,000 |
Treasury Shares | 31,066,207 | 3,662,564
Treasury amount | 1,903,610 | 267,553
Profit (loss) on treasury shares | $ 4,239 | $ 22,842
Fixed capital, Shares | 90,850,000 | 90,850,000
Variable capital, Shares | 406,859,000 | 406,859,000
Class I Shares [Member] |  |
Statement Line Items [Line Items] |  |
Fixed capital, Shares | 90,850,050 |
Class II Shares [Member] |  |
Statement Line Items [Line Items] |  |
Fixed capital, Shares | 406,859,164 |

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- Definition A component of equity representing the capital reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from treasury share transactions. [Refer: Equity; Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition An entity’s own equity instruments, held by the entity or other members of the consolidated group. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 32 -IssueDate 2018-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=32&date=2018-03-01&anchor=para_34&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of fixed capital, shares. + References No definition available. + Details
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- Definition Percentage of legal reserve. + References No definition available. + Details
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