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Income Taxes - Summary of Deferred Tax Related to Items Recognized in OCI (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
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