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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Dividends received $ 2,122,826 $ 1,773,336 $ 2,605,333
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 4,603,284 10,145,615  
Changes in fair value of investment (1,952,414) 883,408  
Dividends received 2,119,668 1,742,242 $ 2,605,333
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 $ 50,033,111 $ 37,572,410