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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Major components of tax expense (income) [abstract] |  |  |
Remeasurement of defined benefit plans | $ 408,735 | $ 3,032,403 | $ (7,734,732)
Effect of financial instruments acquired for hedging purposes |  | (5,337) | (21,046)
Equity investments at fair value | 1,613,667 | (266,753) | 2,858,452
Other | (8,922) |  | 136,879
Deferred tax benefit (expense) recognized in OCI | $ 2,013,480 | $ 2,760,313 | $ (4,760,447)

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- Definition Deferred tax relating to equity investments at fair value on other comprehensive income. + References No definition available. + Details
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