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Income Taxes - Rollforward of deferred income tax assets and liabilities (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period $ 12,380,445 $ 7,665,038
Income statement credit 1,017,430 3,851,836
Credit (Charge) to Other Comprehensive Income and Shares Repurchased (1,080,344) 863,571
Deferred income tax account at end of period 12,317,531 12,380,445
Accrued liabilities    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 3,208,863 2,656,354
Income statement credit 179,426 552,509
Deferred income tax account at end of period 3,388,289 3,208,863
Allowance for doubtful accounts    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 1,160,708 1,187,427
Income statement credit (44,718) (26,719)
Deferred income tax account at end of period 1,115,990 1,160,708
Customer advances    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 2,761,196 2,598,037
Income statement credit (530,238) 163,159
Deferred income tax account at end of period 2,230,958 2,761,196
Property, plant and equipment, net    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (305,654) (954,678)
Income statement credit 1,159,085 649,024
Deferred income tax account at end of period 1,159,085 (305,654)
Tax loss carryforwards    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 13,829,616 10,196,480
Income statement credit (628,278) 3,633,136
Credit (Charge) to Other Comprehensive Income and Shares Repurchased (792,348)  
Deferred income tax account at end of period 12,408,990 13,829,616
Deferred income tax assets of foreign subsidiaries    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 279,683 195,348
Income statement credit (21,914) 84,335
Deferred income tax account at end of period 257,769 279,683
Asset tax    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period   402,880
Income statement credit   (402,880)
Investments    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (4,471,232) (3,504,137)
Income statement credit 721,525 (2,067,429)
Credit (Charge) to Other Comprehensive Income and Shares Repurchased (218,469) 1,100,334
Deferred income tax account at end of period (3,968,176) (4,471,232)
Property, plant and equipment, net    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (305,654)  
Income statement credit 305,654  
Deferred income tax account at end of period   (305,654)
Derivative financial instruments    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period   (1,801)
Income statement credit (355,051) 1,801
Deferred income tax account at end of period (355,051)  
Intangible assets and transmission rights    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (2,898,572) (3,922,230)
Income statement credit 252,305 1,023,658
Deferred income tax account at end of period (2,646,267) (2,898,572)
Prepaid expenses and other items    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (1,184,163) (1,188,642)
Income statement credit (20,366) 241,242
Credit (Charge) to Other Comprehensive Income and Shares Repurchased (69,527) (236,763)
Deferred income tax account at end of period $ (1,274,056) $ (1,184,163)