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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Dividends received $ 2,605,333 $ 2,385,559 $ 5,740,092
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 9,987,851 12,438,019  
Changes in fair value of investment (3,765,688) 622,424  
Dividends received 2,605,333 2,370,559 $ 5,740,092
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 39,028,083 46,682,657  
Other short-term investments $ 9,987,851 $ 12,438,019