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Subsequent Events - Additional Information (Detail) $ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 24, 2019 MXN ($) | Jan. 24, 2019 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Mar. 18, 2019
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of agreement to acquire |  |  | 80.00% | 80.00% |
Major business combination [member] | Telefnica Mviles Guatemala S A [member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of agreement to acquire | 100.00% | 100.00% |  |  |
Purchase price paid | $ 6,326,068 | $ 333,000 |  |  |
Major business combination [member] | Telefnica Mviles El Salvador S A de C V [member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of agreement to acquire | 99.30% | 99.30% |  |  |
Purchase price paid | $ 5,984,118 | $ 315,000 |  |  |
Major business combination [member] | Nextel Telecomunicacoes Ltda [member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of agreement to acquire |  |  |  |  | 100.00%
Purchase price paid |  |  | $ 17,487,578 | $ 905,000 |

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