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Property, plant and equipment (Schedule of Net Book Value of Property, Plant and Equipment) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 16,737,595 $ 16,970,832 $ 15,737,081
Land [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 1,291,000 1,217,000 1,094,000
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 4,056,000 3,625,000 3,743,000
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 6,489,000 7,187,000 7,331,000
Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 76,000 78,000 78,000
Furniture, mixtures and computer Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 64,000 64,000 57,000
Constructions and machinery in-progress [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 4,761,000 $ 4,800,000 $ 3,434,000