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Accounts payable and accrued expenses: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Accounts payable and accrued expenses:    
Suppliers $ 325,701 $ 306,547
Taxes payable 712,448 664,334
Use rights of assets under concession 355,809 455,125
Accounts payable to related parties 101,266 178,294
Lease payable 22,496 22,367
Salaries payable 234,133 221,328
Sundry creditors for services provided 1,143,956 929,483
Accounts payable to contractors 38,241 26,811
Total $ 2,934,050 $ 2,804,289