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Income taxes (Schedule of Income Tax Charged (Credited)) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income taxes $ 2,077,844 $ 3,276,274 $ 752,462
Mexican companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 1,460,057 3,177,506 67,745
Deferred Tax (94,604) 12,978 408,141
Foreign companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 370,860 301,263 444,104
Deferred Tax $ 341,531 $ (215,473) $ (167,528)