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Revenue from Contracts with Customers: Construction services (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contracts with Customers:      
Compulsory works   $ 28,056  
Construction services (Note 3.1.3) $ 3,657,086 $ 1,236,193 $ 935,774