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Income taxes (Schedule of Deferred Income Tax Liability) (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Deferred tax assets | $ 222,310 | $ 132,159
Deferred tax liabilities: |  |
Total deferred liabilities | 3,860,831 | 3,542,265
Deferred tax liabilities, net | 3,638,521 | 3,410,106
Allowance for doubtful accounts [Member] |  |
Deferred tax assets: |  |
Deferred tax assets reduction in allowance for doubtful accounts | (61,536) | (50,476)
Provisions [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 202,407 | 30,641
Advances from customers [Member] |  |
Deferred tax assets: |  |
Deferred tax assets | 283,846 | 182,635
Property, plant and equipment [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 3,321,941 | 3,159,719
Intangible assets from Grupo San [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 329,600 | 318,768
Prepaid expenses [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | $ 6,883 | $ 33,137

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