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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 ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Sep. 30, 2016
MXN ($)
May 31, 2016
USD ($)
Disclosure of detailed information about business combination [line items]                              
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  
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                     $ 329,366,000 $ 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              
Other Entities [member]                              
Disclosure of detailed information about business combination [line items]                              
Goodwill amount recognized                       260,355,000      
Net of cash paid                       3,249,164,000      
Telekom Austria [member]                              
Disclosure of detailed information about business combination [line items]                              
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.                      
Acquisition of fixed line operator       100.00%                      
Telekom Austria [member] | Metronet [member]                              
Disclosure of detailed information about business combination [line items]                              
Amount paid for business acquisition $ 1,550,534,000                            
Goodwill amount recognized $ 502,574,000                            
Acquisition of fixed line operator 97.68%                            
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]                              
Additional non-controlling interest acquired                       $ 23,881,000