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Shareholders' Equity - Additional Information (Detail) - MXN ($) $ / shares in Units, $ in Thousands |  |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 24, 2020 | Apr. 09, 2019 | Apr. 24, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |  |  |
Capital requirements |  |  |  | $ 270,049 |
Number of shares issued |  |  |  | 71,063,212,170 |
Number of shares outstanding |  |  |  | 66,862,560,649 | 66,004,214,830
Number of treasury shares held |  |  |  | 4,200,651,521 | 5,058,997,340
Merger transaction description |  |  |  | any transaction representing 20% or more of the Company’s consolidated assets |
Legal reserve |  |  |  | $ 358,440 | $ 358,440
Amount of Mexican withholding tax |  |  |  | 10.00% |
Bottom of range [member] | Legal reserve [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Increase in legal reserve |  |  |  | 5.00% |
Top of range [member] | Legal reserve [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Increase in legal reserve |  |  |  | 20.00% |
Capital Stock Class AA Voting Rights [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued |  |  |  | 20,578,173,274 |
Capital Stock Class A Voting Rights [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued |  |  |  | 519,948,436 |
Capital Stock Class L Limited Voting Rights [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued |  |  |  | 49,965,090,460 |
Capital Stock Class Aa [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares outstanding |  |  |  | 20,578,173,274 | 20,601,632,660
Dividends paid | $ 0.38 | $ 0.35 |  |  |
Capital Stock Class Aa [member] | Bottom of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of capital stock |  |  |  | 20.00% |
Capital Stock Class Aa [member] | Top of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of capital stock |  |  |  | 51.00% |
Capital Stock Class A [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares outstanding |  |  |  | 519,926,536 | 530,563,378
Dividends paid | 0.38 | 0.35 |  |  |
Capital Stock Class A [member] | Bottom of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of capital stock |  |  |  | 19.60% |
Capital Stock Class A [member] | Top of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of capital stock |  |  |  | 49.00% |
Capital Stock Class L [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares outstanding |  |  |  | 45,764,460,839 | 44,872,018,792
Number of treasury shares held |  |  |  | 4,200,629,621 | 5,058,975,440
Periodic payment of dividend |  | 0.18 | $ 0.19 |  |
Capital Stock Class L [member] | Top of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of capital stock |  |  |  | 80.00% |
Class L [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends paid | $ 0.38 | 0.35 |  |  |
Periodic payment of dividend |  | $ 0.17 |  |  |
Periodic payable date of dividend | July 20 and November 09, 2020 |  |  |  |
Class A [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of treasury shares held |  |  |  | 21,900 | 21,900

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