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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Remeasurement of defined benefit plans $ 3,032,403 $ (7,734,732) $ 7,786,292
Effect of financial instruments acquired for hedging purposes (5,337) (21,046) (16,069)
Available for sale securities (266,753) 2,858,452 169,529
Other   136,879 (4,019)
Deferred tax benefit (expense) recognized in OCI $ 2,760,313 $ (4,760,447) $ 7,935,733