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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Additional Information (Detail) - MXN ($) $ in Thousands |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 18, 2019 | Feb. 28, 2017 | Apr. 24, 2019 | Dec. 31, 2019 | Dec. 31, 2017
Other Entities [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill amount recognized |  |  |  |  | $ 260,355
Net of cash paid |  |  |  | $ 48,808 | 3,249,164
Additional non-controlling interest acquired |  |  |  | 83,055 |
Nextel Telecomunicacoes Ltda [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Amount paid for business acquisition |  |  |  | 7,335,045 |
Goodwill amount recognized |  |  |  | 8,228,664 |
Acquisition of fixed and mobile line operator | 100.00% |  |  |  |
Consideration transferred, acquisition-date fair value | $ 18,028,103 |  |  |  |
Liabilities incurred | $ 9,325,750 |  |  |  |
ClaroTelefnica Moviles Guatemala SA [Member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Amount paid for business acquisition |  |  | $ 5,946,787 |  |
Goodwill amount recognized |  |  |  | $ 2,632,451 |
Acquisition of fixed and mobile line operator |  |  | 100.00% |  |
Telekom Austria [member] | Metronet [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Amount paid for business acquisition |  | $ 1,550,534 |  |  |
Goodwill amount recognized |  | $ 502,574 |  |  |
Acquisition of fixed and mobile line operator |  | 97.68% |  |  |
Mexican and Brazil subsidiaries [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Additional non-controlling interest acquired |  |  |  |  | $ 23,881

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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