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Income taxes (Schedule of Income Tax Charged (Credited)) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income taxes [1] $ 3,276,274 $ 752,462 $ 1,122,809
Mexican companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 3,177,506 67,745 19
Deferred Tax 12,978 408,141 656,060
Foreign companies [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax 301,263 444,104 44,751
Deferred Tax $ (215,473) $ (167,528) $ 421,979
[1] For the purpose of determining the effective tax rate, the payments corresponding to taxes from previous years and expenses that were paid by various group companies derived from repair agreements during the 2019 fiscal year were not considered within the income tax expense.