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Equity - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 42 Months Ended |
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Nov. 20, 2018 MXN ($) $ / shares | Aug. 21, 2018 MXN ($) $ / shares | Aug. 20, 2018 MXN ($) $ / shares | May 11, 2018 MXN ($) | Apr. 25, 2018 MXN ($) $ / shares | Nov. 16, 2017 MXN ($) $ / shares | Aug. 14, 2017 MXN ($) $ / shares | May 08, 2017 MXN ($) | Apr. 25, 2017 $ / shares | Nov. 18, 2016 MXN ($) $ / shares | Aug. 25, 2016 MXN ($) $ / shares | May 09, 2016 MXN ($) | Apr. 26, 2016 MXN ($) $ / shares | Dec. 31, 2018 MXN ($) Vote Director shares | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Feb. 28, 2014 MXN ($) shares | Apr. 21, 2015 MXN ($)
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of acquisition, nominations and compensation corresponding to operating committee members |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Dividend payment per share | $ / shares | $ 3.81 | $ 3.81 | $ 3.81 |  | $ 7.62 | $ 2.86 | $ 2.86 |  | $ 5.72 | $ 1.79 | $ 2.28 |  | $ 4.07 |  |  |  |  |
Dividend payment | $ 2,002,443,000 | $ 2,002,443,000 | $ 2,002,443,000 |  |  | $ 1,503,146,000 | $ 1,503,146,000 |  |  | $ 940,780,000 | $ 1,198,312,000 |  |  | $ 4,004,886,000 |  |  |  |
Canceled Reserve for repurchase of shares |  |  |  |  | $ 995,000,000 |  |  |  |  |  |  |  | $ 950,000,000 |  |  |  |  | $ 850,000,000
Reserve for repurchase of shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,983,374,000 | $ 2,728,374,000 | $ 2,683,374,000 |  |
Capital reduction per share | $ / shares |  |  |  |  | $ 2.38 |  |  |  | $ 3.33 |  |  |  | $ 3.33 |  |  |  |  |
Capital reduction |  |  |  | $ 1,250,870,000 |  |  |  | $ 1,750,167,000 |  |  |  | $ 1,750,167,000 |  | $ 1,250,870,000 | 1,750,167,000 | 1,750,167,000 |  |
Description of legal reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | The General Corporate Law requires that at least 5% of the unconsolidated net income of the year, be transferred to the legal reserve until the reserve equals 20% of capital stock at par value (nominal pesos). |  |  |  |
Legal reserve |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,345,709,000 | $ 1,119,029,000 | $ 960,943,000 |  |
Percentage of legal reserve |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.30% | 12.40% | 8.90% |  |
Maximum amount of repurchase shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,983,374,000 |  |  |  |
Repurchases of shares amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,733,374,000 |
Remaining Shares on repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |
Number of shares repurchased | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 35,424,453 |
Non-Mexican and individual shareholders [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional income tax on dividend |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Top of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for repurchase of shares |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  | $ 995,000,000 |  |  |  |  | $ 950,000,000
Series BB common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Number of directors | Director |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Series B And BB Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vote per share | Vote |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Maximum percentage of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Percentage of not having voting rights |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Series B common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Percentage of voting rights |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |

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- Definition A component of equity representing the reserve for the redemption of the entity's own shares. + 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 amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2018-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2018-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + 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 A component of equity representing reserves created based on legal requirements. + 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 Canceled capital redemption reserve. + References No definition available. + Details
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- Definition Description of legal reserves explanatory. + References No definition available. + Details
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- Definition Disclosure of equity [Line Items] + References No definition available. + Details
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- Definition Number of shares repurchased. + References No definition available. + Details
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- Definition Percentage of acquisition nominations and compensation corresponding to operating committee members. + References No definition available. + Details
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