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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Additional Information (Details) (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Feb. 28, 2017 MXN ($) | Jan. 31, 2017 MXN ($) | Jan. 31, 2017 USD ($) | Nov. 30, 2016 MXN ($) | Aug. 31, 2016 | Jul. 31, 2016 | May 31, 2016 MXN ($) | May 31, 2016 USD ($) | Jan. 31, 2016 MXN ($) | Dec. 31, 2014 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Sep. 30, 2016 MXN ($) | May 31, 2016 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions controlling interest |  |  |  |  |  |  |  |  | 99.99% |  |  |  |  |  |
Amount paid for business acquisition |  |  |  |  |  |  |  |  | $ 1,088,668,000 |  |  |  |  |  |
Goodwill amount recognized |  |  |  |  |  |  |  |  | $ 1,046,253,000 |  |  |  |  | $ 1,251,464 |
Tracfone Wireless Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional business acquisition |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |  | 1.80%
Percentage of capital stock |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  | 100.00%
Amount paid for business acquisition |  |  |  |  |  |  | $ 2,300,553,000 |  |  |  |  |  |  |  | $ 124,673
Gain loss on equity transactions |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Olo and TVS [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for business acquisition |  |  |  |  |  |  | $ 1,854,379,000 | $ 102,343 |  |  |  |  |  |  |
Goodwill amount recognized |  |  |  |  |  |  |  |  |  |  | $ 329,366,000 | $ 188,452,000 | $ 1,454,333,000 |  |
Percentage of capital stock |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  | 100.00%
Amount paid from Company |  | $ 2,079,095,000 | $ 94,789 |  |  |  | $ 152,214,000 | $ 7,554 |  |  |  |  |  |  |
Other Entities [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill amount recognized |  |  |  |  |  |  |  |  |  |  |  | 260,355,000 |  |  |
Net of cash paid |  |  |  |  |  |  |  |  |  |  |  | 3,249,164,000 |  |  |
Telekom Austria [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for business acquisition |  |  |  | $ 582,931,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill amount recognized |  |  |  | $ 200,973,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding common stock sold |  |  |  |  | 0.89% | 7.80% |  |  |  |  |  |  |  |  |
Percentage of stake reduced |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |
Cash received from sale of outstanding common stock |  |  |  |  |  |  |  |  |  | $ 6,323,336,000 |  |  |  |  |
Name of acquiree |  |  |  | Atlant Telecom (Atlant) and its subsidiary TeleSet |  |  |  |  |  |  |  |  |  |  |
Description of acquiree |  |  |  | Leading privately owned fixed-line operators in Belarus offering fixed-line broadband, IPTV and cable TV as well as a video and audio library. |  |  |  |  |  |  |  |  |  |  |
Acquisition of fixed line operator |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Telekom Austria [member] | Metronet [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for business acquisition | $ 1,550,534,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill amount recognized | $ 502,574,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of fixed line operator | 97.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telekom Austria [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sale reduced overall shareholding |  |  |  |  | 59.70% |  |  |  |  |  |  |  |  |  |
Telekom Austria [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sale reduced overall shareholding |  |  |  |  | 51.89% |  |  |  |  |  |  |  |  |  |
Mexican and Brazil subsidiaries [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional non-controlling interest acquired |  |  |  |  |  |  |  |  |  |  |  | $ 23,881,000 |  |  |

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