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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Major components of tax expense (income) [abstract] |  |  |
Remeasurement of defined benefit plans | $ 4,151,600 | $ 9,217,320 | $ 408,735
Equity investments at fair value | (665,814) | (378,606) | 1,613,667
Other | (35,670) |  | (8,922)
Revaluation assets | (29,922,597) |  |
Deferred tax benefit recognized in OCI | $ (26,472,481) | $ 8,838,714 | $ 2,013,480

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