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Income taxes (Schedule of Income Tax Expense (Benefit)) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]      
Expected benefit, expense $ 514,294 $ 1,308,828 $ 890,249
Increase (decrease) as a result of:      
Inflation effect, net (417,960) (114,419) (217,249)
Impact of the nominal rate differences between the USA and Mexico (23,368) (35,914) (16,572)
Benefit from utilization of tax loss carry-forward and others [1] (987,135) (1,238,444) (115,068)
Others, net (includes permanent items) 1,802,118 832,411 581,449
Income tax expense $ 887,949 $ 752,462 $ 1,122,809
Effective tax rate 54.26% 17.92% 37.21%
[1] This amount corresponds to the income tax benefit obtained by those companies that used tax loss carry-forwards in the years presented that were generated previously 2019, 2018 and 2017 , less the effect of tax losses incurred by some subsidiaries for which no deferred tax asset was recorded.