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Accounts payable and accrued expenses: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts payable and accrued expenses:    
Suppliers $ 290,687 $ 353,885
Taxes payable 311,847 57,174
Use rights of assets under concession 337,087 5,070
Accounts payable to related parties 127,901 53,598
Lease payable 24,510 17,236
Salaries payable 166,089 128,105
Sundry creditors for services provided 959,376 639,726
Accounts payable to contractors 271,462 343,610
Total $ 2,488,959 $ 1,598,404