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Income taxes (Schedule of Deferred Income Tax Liability) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Deferred tax assets $ 114,269 $ 145,285
Deferred tax liabilities:    
Total deferred liabilities 3,622,015 3,513,261
Deferred tax liabilities, net 3,507,746 3,367,976
Allowance for doubtful accounts [Member]    
Deferred tax assets:    
Deferred tax assets 1,045 64,434
Provisions [Member]    
Deferred tax assets:    
Deferred tax assets   977
Deferred tax liabilities:    
Total deferred liabilities 57,816  
Advances from customers [Member]    
Deferred tax assets:    
Deferred tax assets 113,224 79,874
Property, plant and equipment [Member]    
Deferred tax liabilities:    
Total deferred liabilities 3,224,295 3,161,272
Intangible assets from Grupo San [Member]    
Deferred tax liabilities:    
Total deferred liabilities 310,025 298,566
Prepaid expenses [Member]    
Deferred tax liabilities:    
Total deferred liabilities $ 29,879 $ 53,423