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Intangible Assets, Net and Goodwill - Additional Information (Detail) € in Thousands, S/ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 14, 2017 MXN ($) | Feb. 24, 2017 MXN ($) | May 26, 2016 MXN ($) | May 26, 2016 PEN (S/) | Jan. 31, 2017 MXV ( ) | Jul. 31, 2016 MXN ($) | Jul. 31, 2016 USD ($) | May 30, 2016 MXN ($) | May 30, 2016 EUR (€) | Feb. 28, 2016 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Feb. 28, 2016 USD ($)
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | $ 25,798,610 |  | $ 24,348,182 | $ 19,522,968 |
Telekom Austria [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  | $ 410,713 | € 18,837 |  |  |  |  |  |
700 MHz frequency band [member] | Renewal of license [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license | |  |  |  |  | 3,592,034 |  |  |  |  |  |  |  |  |  |
Paraguay subsidiary [member] | 30 Mhz spectrum [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  | $ 830,719 |  |  |  |  | $ 46,000
Radiomovil Dipsa S A de C V (Telcel) [member] | Acquired through auction [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  |  |  | $ 2,098,060 |  |  |  |  |
Mtel Bulgaria [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  | $ 135,441 | € 6,212 |  |  |  |  |  |
Radiomovil dipsa [member] | Eight point four Mega Hertz frequency band [member] | Renewal of license [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  | $ 917,431 |  |  |  |  |  |  |  |  |  |  |  |  |
Radiomovil dipsa [member] | Two point five Giga Hertz frequency band [member] | Renewal of license [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license | $ 5,305,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Peru subsidiary [member] | 700 MHz frequency band [member] | Spectrum in public auction [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  | $ 5,627,316 | S/ 1,002,523 |  |  |  |  |  |  |  |  |  |  |
Frequency band expiration year |  |  | Dec. 31, 2036 | Dec. 31, 2036 |  |  |  |  |  |  |  |  |  |  |
Dominican Republic [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  |  |  |  | $ 709,829 | R$ 1,831,427 |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  | 11 years | 11 years |  |  |
Paraguay Puerto Rico Europe Argentina and other countries [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  |  |  |  | $ 3,517,415 |  |  |  |
Ecuador [member] | Ecuador Telecom, S.A. [member] | License to operate TV [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  | $ 27,700 | $ 1,500 |  |  |  |  |  |  |  |
Chile Europe uruguay and other countries [member] | Other licenses [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of intangible assets and goodwill [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for license |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,532,088 |  |

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