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Property, plant and equipment (Schedule of Net Book Value of Property, Plant and Equipment) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 16,970,832 $ 15,737,081 $ 14,491,000
Land [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 1,217,000 1,094,000 1,105,000
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 3,625,000 3,743,000 3,854,000
Machinery and Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 7,187,000 7,331,000 6,103,000
Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 78,000 78,000 77,000
Furniture, mixtures and computer Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 64,000 57,000 59,000
Constructions and machinery in-progress [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 4,800,000 $ 3,434,000 $ 3,293,000