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Income taxes (Schedule of Income Tax Charged (Credited)) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income taxes $ 752,462 $ 1,122,809 $ 936,394
Mexican companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 67,745 19 6,751
Deferred Tax 408,141 656,060 660,916
Foreign companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 444,104 44,751 60,965
Deferred Tax $ (167,528) $ 421,979 $ 207,762