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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, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance $ 744,851,210 $ 638,922,453
Beginning balance   119,387,660
Cash flow (82,715,366) (18,491,635)
Foreign currency exchange and other 75,574,353 5,032,732
Ending balance 737,710,197 744,851,210
Debt [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 624,254,477 638,922,453
Cash flow (53,091,801) 8,273,440
Foreign currency exchange and other 57,220,280 (22,941,416)
Ending balance 628,382,956 624,254,477
Liability Related to Right of Use of Assets [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 120,596,733  
Beginning balance   119,387,660
Cash flow (29,623,565) (26,765,075)
Foreign currency exchange and other 18,354,073 27,974,148
Ending balance $ 109,327,241 $ 120,596,733