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Intangible Assets, Net and Goodwill - Additional Information (Detail)
€ in Thousands, S/ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, in Thousands
 1 Months Ended 12 Months Ended
Jul. 14, 2017
MXN ($)
Feb. 24, 2017
MXN ($)
May 26, 2016
MXN ($)
May 26, 2016
PEN (S/)
Jan. 31, 2017
MXV ( )
Jul. 31, 2016
MXN ($)
Jul. 31, 2016
USD ($)
May 30, 2016
MXN ($)
May 30, 2016
EUR (€)
Feb. 28, 2016
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Feb. 28, 2016
USD ($)
Disclosure of intangible assets and goodwill [line items]                              
Amortization of intangible assets                     $ 25,798,610   $ 24,348,182 $ 19,522,968  
Telekom Austria [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license               $ 410,713 € 18,837            
700 MHz frequency band [member] | Renewal of license [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license |         3,592,034                    
Paraguay subsidiary [member] | 30 Mhz spectrum [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Total consideration                   $ 830,719         $ 46,000
Radiomovil Dipsa S A de C V (Telcel) [member] | Acquired through auction [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license                   $ 2,098,060          
Mtel Bulgaria [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license               $ 135,441 € 6,212            
Radiomovil dipsa [member] | Eight point four Mega Hertz frequency band [member] | Renewal of license [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license   $ 917,431                          
Radiomovil dipsa [member] | Two point five Giga Hertz frequency band [member] | Renewal of license [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license $ 5,305,498                            
Peru subsidiary [member] | 700 MHz frequency band [member] | Spectrum in public auction [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license     $ 5,627,316 S/ 1,002,523                      
Frequency band expiration year     Dec. 31, 2036 Dec. 31, 2036                      
Dominican Republic [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license                     $ 709,829 R$ 1,831,427      
Estimated useful life of intangible assets                     11 years 11 years      
Paraguay Puerto Rico Europe Argentina and other countries [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license                     $ 3,517,415        
Ecuador [member] | Ecuador Telecom, S.A. [member] | License to operate TV [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license           $ 27,700 $ 1,500                
Chile Europe uruguay and other countries [member] | Other licenses [member]                              
Disclosure of intangible assets and goodwill [line items]                              
Amount paid for license                         $ 2,532,088