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Derivative Financial Instruments - Additional Information (Details) (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
changes in fair value of derivative financial instruments gain (loss) $ 8,192,567 $ (9,622,233) $ 15,128,269
Effect of derivative financial instruments acquired for hedging purposes $ 12,292 $ 48,496 $ 37,011
Derivatives [member] | Debt securities [member]      
Disclosure of detailed information about financial instruments [line items]      
weighted-average interest rate 4.00% 3.70% 3.90%