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Debt, Finance Lease Obligations and Other Notes Payable - Reconciliation of long-term debt and finance lease obligations arising from financing activities (Details)
$ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Finance cost   $ (9,245,671) $ (11,031,585) $ (8,665,398)
Cash in financing activities, Proceeds   5,973,000 5,728,498 2,487,936
Repayments of borrowings   (851,659) (73,850) $ (883,340)
Principal amount   123,550,897    
Revolving credit facility        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Principal amount $ 583      
Term of debt instrument 3 years      
Total debt and lease obligations        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance at beginning of the period   134,680,032    
New Debt   10,500,000    
Payments   (11,663,870)    
Foreign Exchange Income   (4,376,331)    
Interest   33,840    
Balance at end of the period   129,173,671 134,680,032  
Finance cost   (50,042)    
Expense on Senior Notes prepayment   (158,496)    
Cash in financing activities, Proceeds   10,449,958    
Repayments of borrowings   (11,822,366)    
Debt        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance at beginning of the period   128,288,206    
New Debt   10,500,000    
Payments   (11,094,159)    
Foreign Exchange Income   (4,143,150)    
Balance at end of the period   123,550,897 128,288,206  
Satellite transponder lease obligations        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance at beginning of the period   5,522,565    
Payments   (351,335)    
Foreign Exchange Income   (233,181)    
Balance at end of the period   4,938,049 5,522,565  
Finance lease obligations        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance at beginning of the period   869,261    
Payments   (218,376)    
Interest   33,840    
Balance at end of the period   $ 684,725 $ 869,261