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Property, plant and equipment (Schedule of Accumulated Depreciation of Property, Plant and Equipment) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year $ 15,737,081 $ 14,491,000
Depreciation expense 1,102,331 1,340,375
Balance at end of year 16,970,832 15,737,081
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 3,743,000 3,854,000
Balance at end of year 3,625,000 3,743,000
Machinery and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 7,331,000 6,103,000
Balance at end of year 7,187,000 7,331,000
Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 78,000 77,000
Balance at end of year 78,000 78,000
Furniture, mixtures and computer Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 57,000 59,000
Balance at end of year 64,000 57,000
Accumulated amortization [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 18,659,000 17,610,000
Depreciation expense 1,102,000 1,341,000
Translation effects (170,000) (292,000)
Balance at end of year 19,591,000 18,659,000
Accumulated amortization [Member] | Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 1,033,000 1,005,000
Depreciation expense 37,000 35,000
Translation effects (15,000) (7,000)
Balance at end of year 1,055,000 1,033,000
Accumulated amortization [Member] | Machinery and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 17,474,000 16,457,000
Depreciation expense 1,057,000 1,297,000
Translation effects (151,000) (280,000)
Balance at end of year 18,380,000 17,474,000
Accumulated amortization [Member] | Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 80,000 78,000
Depreciation expense 3,000 3,000
Translation effects (2,000) (1,000)
Balance at end of year 81,000 80,000
Accumulated amortization [Member] | Furniture, mixtures and computer Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 72,000 70,000
Depreciation expense 5,000 6,000
Translation effects (2,000) (4,000)
Balance at end of year $ 75,000 $ 72,000