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Right of use assets and lease debt - Summary of lease cost recognized expenses (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement [line items]    
Depreciation expense of right-of-use assets $ 28,371,085 $ 23,593,566
Interest expense on lease liabilities 9,134,288 7,940,240
Expense relating to short-term leases 32,238 1,980,361
Expense relating to leases of low-value assets 2,883 25,935
Variable lease payments 78,494 1,299,502
Total 37,618,988 34,839,604
Other [Member]    
Statement [line items]    
Depreciation expense of right-of-use assets 22,404,924 18,176,521
Interest expense on lease liabilities 7,081,693 5,654,721
Expense relating to short-term leases 32,238 1,978,403
Expense relating to leases of low-value assets 2,883 25,935
Variable lease payments 78,494 1,299,502
Total 29,600,232 27,135,082
Related Party [Member]    
Statement [line items]    
Depreciation expense of right-of-use assets 5,966,161 5,417,045
Interest expense on lease liabilities 2,052,595 2,285,519
Expense relating to short-term leases   1,958
Total $ 8,018,756 $ 7,704,522