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Debt - Summary of Long Term Debt Maturities (Detail) $ in Thousands, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | $ 542,691,819 | $ 27,572 | $ 646,139,058
2020 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 121,184,630 |  |
2021 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 54,189,122 |  |
2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 88,027,828 |  |
2023 and Thereafter [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | $ 279,290,239 |  |

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