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Right of use assets and lease debt - Summary of lease cost recognized in profit or loss (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
MXN ($)
Statement [line items]  
Depreciation expense of right-of-use assets $ 23,593,566
Interest expense on lease liabilities 7,940,240
Expense relating to short-term leases 1,980,361
Expense relating to leases of low-value assets 25,935
Variable lease payments 1,299,502
Total 34,839,604
Other [Member]  
Statement [line items]  
Depreciation expense of right-of-use assets 18,176,521
Interest expense on lease liabilities 5,654,721
Expense relating to short-term leases 1,978,403
Expense relating to leases of low-value assets 25,935
Variable lease payments 1,299,502
Total 27,135,082
Related Party [Member]  
Statement [line items]  
Depreciation expense of right-of-use assets 5,417,045
Interest expense on lease liabilities 2,285,519
Expense relating to short-term leases 1,958
Total $ 7,704,522