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Income taxes (Schedule of Deferred Income Tax Liability) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Deferred tax assets $ 132,159 $ 114,269
Deferred tax liabilities:    
Total deferred liabilities 3,542,265 3,622,015
Deferred tax liabilities, net 3,410,106 3,507,746
Allowance for doubtful accounts [Member]    
Deferred tax assets:    
Deferred tax assets   1,045
Deferred tax assets reduction in allowance for doubtful accounts (50,476)  
Provisions [Member]    
Deferred tax liabilities:    
Total deferred liabilities 30,641 57,816
Advances from customers [Member]    
Deferred tax assets:    
Deferred tax assets 182,635 113,224
Property, plant and equipment [Member]    
Deferred tax liabilities:    
Total deferred liabilities 3,159,719 3,224,295
Intangible assets from Grupo San [Member]    
Deferred tax liabilities:    
Total deferred liabilities 318,768 310,025
Prepaid expenses [Member]    
Deferred tax liabilities:    
Total deferred liabilities $ 33,137 $ 29,879