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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Additional Information (Detail) - MXN ($)
$ in Thousands
 1 Months Ended 4 Months Ended 12 Months Ended
Dec. 18, 2019
Feb. 28, 2017
Apr. 24, 2019
Dec. 31, 2019
Dec. 31, 2017
Other Entities [member]          
Disclosure of detailed information about business combination [line items]          
Goodwill amount recognized         $ 260,355
Net of cash paid       $ 48,808 3,249,164
Additional non-controlling interest acquired       83,055  
Nextel Telecomunicacoes Ltda [member]          
Disclosure of detailed information about business combination [line items]          
Amount paid for business acquisition       7,335,045  
Goodwill amount recognized       8,228,664  
Acquisition of fixed and mobile line operator 100.00%        
Consideration transferred, acquisition-date fair value $ 18,028,103        
Liabilities incurred $ 9,325,750        
ClaroTelefnica Moviles Guatemala SA [Member]          
Disclosure of detailed information about business combination [line items]          
Amount paid for business acquisition     $ 5,946,787    
Goodwill amount recognized       $ 2,632,451  
Acquisition of fixed and mobile line operator     100.00%    
Telekom Austria [member] | Metronet [member]          
Disclosure of detailed information about business combination [line items]          
Amount paid for business acquisition   $ 1,550,534      
Goodwill amount recognized   $ 502,574      
Acquisition of fixed and mobile line operator   97.68%      
Mexican and Brazil subsidiaries [member]          
Disclosure of detailed information about business combination [line items]          
Additional non-controlling interest acquired         $ 23,881