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Equity Investments at Fair Value Through OCI and Other Short-term Investments - Additional Information (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Dividends received $ 1,773,336 $ 2,605,333 $ 2,385,559
Investments accounted for using equity method Koninklijke KPN [member]      
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Other short-term investments 10,145,615 9,987,851  
Changes in fair value of investment 883,408 (3,765,688)  
Dividends received 1,742,242 2,605,333 $ 2,370,559
Equity and other short term investments [member] | Investments accounted for using equity method Koninklijke KPN [member]      
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Equity investments at fair value through OCI 37,572,410 39,028,083  
Other short-term investments $ 10,145,615 $ 9,987,851