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Financial Assets and Liabilities - Summary of changes in liabilities arising from financing activities (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance $ 638,922,453 $ 697,884,899
Beginning balance 119,387,660  
Cash flow (18,491,635) (34,050,923)
Foreign currency exchange and other 5,032,732 (24,911,523)
Ending balance 744,851,210 638,922,453
Debt [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 638,922,453  
Cash flow 8,273,440  
Foreign currency exchange and other (22,941,416)  
Ending balance 624,254,477 $ 638,922,453
Liability Related to Right of Use of Assets [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 119,387,660  
Cash flow (26,765,075)  
Foreign currency exchange and other 27,974,148  
Ending balance $ 120,596,733