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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Additional Information (Details) (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2017
MXN ($)
Jan. 31, 2017
MXN ($)
Jan. 31, 2017
USD ($)
Nov. 30, 2016
MXN ($)
Aug. 31, 2016
Jul. 31, 2016
May 31, 2016
MXN ($)
May 31, 2016
USD ($)
Jan. 31, 2016
MXN ($)
Sep. 30, 2015
Jun. 30, 2015
Feb. 28, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Sep. 30, 2016
MXN ($)
May 31, 2016
USD ($)
Dec. 31, 2015
MXN ($)
Disclosure of detailed information about business combination [line items]                                      
Cash                                     $ 2,864,968,000
Goodwill                           $ 151,463,232,000 $ 7,655,000 $ 152,632,635,000     137,113,716,000
Business acquisitions controlling interest                 99.99%                    
Amount paid for business acquisition                 $ 1,088,668,000                    
Goodwill amount recognized                 $ 1,046,253,000               $ 1,251,464    
Telekom Austria [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition of fixed line operator       100.00%                              
Amount paid for business acquisition       $ 582,931,000                              
Goodwill amount recognized       $ 200,973,000                              
Percentage of outstanding common stock sold         0.89% 7.80%                          
Percentage of stake reduced                         51.00%            
Cash received from sale of outstanding common stock                         $ 6,323,336,000            
Name of acquiree       Atlant Telecom (Atlant) and its subsidiary TeleSet                              
Description of acquiree       Leading privately owned fixed-line operators in Belarus offering fixed-line broadband, IPTV and cable TV as well as a video and audio library.                              
Telekom Austria [member] | Top of range [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Percentage of sale reduced overall shareholding         59.70%                            
Telekom Austria [member] | Bottom of range [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Percentage of sale reduced overall shareholding         51.89%                            
Mexican and Brazil subsidiaries [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Cash                                     119,704,000
Additional non-controlling interest acquired                           23,881,000         1,031,049,000
Europe [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Goodwill                                     711,723,000
Goodwill expected deductible for income tax purposes                                     $ 0
Telmex and consertel subsidiaries [member] | Hitss [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Additional ownership interest percentage                       35.00%              
Acquisition of fixed line operator                       68.90%              
Cash                       $ 472,481,000              
Goodwill                       205,141,000              
Goodwill expected deductible for income tax purposes                       $ 0              
Blizoo [member] | Telekom Austria [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition of fixed line operator                     100.00%                
Number of cable operator                     8                
Amis [member] | Telekom Austria [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition of fixed line operator                   100.00%                  
Blizoo Bulgaria [member] | Telekom Austria [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition of fixed line operator                   100.00%                  
Tracfone Wireless Inc [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Additional business acquisition             1.80%                     1.80%  
Percentage of capital stock             100.00%                     100.00%  
Amount paid for business acquisition             $ 2,300,553,000                     $ 124,673  
Gain loss on equity transactions             0                        
Olo and TVS [Member]                                      
Disclosure of detailed information about business combination [line items]                                      
Amount paid for business acquisition             $ 1,854,379,000 $ 102,343                      
Goodwill amount recognized                           188,452,000   $ 1,454,333,000      
Percentage of capital stock             100.00%                     100.00%  
Amount paid from Company   $ 2,079,095,000 $ 94,789       $ 152,214,000 $ 7,554                      
Metronet [member] | Telekom Austria [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Acquisition of fixed line operator 97.68%                                    
Amount paid for business acquisition $ 1,550,534,000                                    
Goodwill amount recognized $ 502,574,000                                    
Other Entities [member]                                      
Disclosure of detailed information about business combination [line items]                                      
Cash                           3,249,164,000          
Goodwill amount recognized                           $ 260,355,000