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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Schedule of Changes in Allowance for Expected Credit Losses (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]      
Balance at beginning of year $ (39,480,909) $ (40,798,025) $ (39,044,925)
Increases recorded in expenses (19,112,635) (16,346,395) (19,535,707)
Adjustment on initial application of IFRS 9     (2,400,783)
Write-offs 11,953,227 17,839,957 15,497,254
Business combination (2,066) (3,265,490)  
Translation effect 2,090,648 3,089,044 4,686,136
Balance at end of year $ (44,551,735) $ (39,480,909) $ (40,798,025)