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Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail) $ / shares in Units, $ in Thousands, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 MXN ($) $ / shares shares | Dec. 31, 2016 MXN ($) $ / shares shares
Earnings per share [abstract] |  |  |  |
Net profit for the period attributable to equity holders of the parent | $ 52,566,197 | $ 2,670 | $ 29,325,921 | $ 8,649,427
Weighted average shares (in millions) | shares | 66,055 | 66,055 | 65,909 | 65,693
Earnings per share attributable to equity holders of the parent | $ / shares | $ 0.79 |  | $ 0.44 | $ 0.13

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2018-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_66&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_81B_a_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + Details
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