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Income Taxes - Summary of Deferred Tax Related to Items Recognized in OCI (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |  |
Remeasurement of defined benefit plans | $ 9,217,320 | $ 408,735 | $ 3,032,403
Effect of financial instruments acquired for hedging purposes |  |  | (5,337)
Equity investments at fair value | (378,606) | 1,613,667 | (266,753)
Other |  | (8,922) |
Deferred tax benefit (expense) recognized in OCI | $ 8,838,714 | $ 2,013,480 | $ 2,760,313

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