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Income taxes (Schedule of Income Tax Expense (Benefit)) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]      
Expected benefit, expense $ 1,308,828 $ 890,249 $ 1,591,129
Increase (decrease) as a result of:      
Inflation effects, net (114,419) (217,249) (62,708)
Effect between nominal rate from USA and Mexico (35,914) (16,572) 157,366
Benefit from utilization of tax loss carry-forward and others [1] (1,238,444) (115,068) (1,165,805)
Others, net (includes permanent items) 832,411 581,449 416,412
Income tax expense $ 752,462 $ 1,122,809 $ 936,394
Effective tax rate [2] 17.92% 37.21% 17.68%
[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, less the effect of tax losses incurred by some subsidiaries for which no deferred tax asset was recorded.
[2] This amount includes $ 9,014,364 corresponding to a tax loss from the sale of shares which, according to the Income Tax Law, can only be applied against taxable profits on the sale of shares generated in the future.