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Property, plant and equipment (Schedule of Cost of Investment 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
Balance at end of year 16,970,832 15,737,081
Land [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 1,094,000 1,105,000
Balance at end of year 1,217,000 1,094,000
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
Constructions and machinery in-progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 3,434,000 3,293,000
Balance at end of year 4,800,000 3,434,000
Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 34,396,000 32,101,000
Additions 2,914,000 3,040,000
Translation adjustments (748,000) (745,000)
Balance at end of year 36,562,000 34,396,000
Cost [Member] | Land [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 1,094,000 1,105,000
Additions 137,000  
Translation adjustments (14,000) (11,000)
Balance at end of year 1,217,000 1,094,000
Cost [Member] | Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 4,776,000 4,859,000
Additions 90,000 36,000
Translation adjustments (186,000) (119,000)
Balance at end of year 4,680,000 4,776,000
Cost [Member] | Machinery and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 24,805,000 22,560,000
Additions 1,305,000 2,817,000
Translation adjustments (543,000) (572,000)
Balance at end of year 25,567,000 24,805,000
Cost [Member] | Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 158,000 155,000
Additions 1,000 4,000
Translation adjustments   (1,000)
Balance at end of year 159,000 158,000
Cost [Member] | Furniture, mixtures and computer Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 129,000 129,000
Additions 11,000 2,000
Translation adjustments (1,000) (2,000)
Balance at end of year 139,000 129,000
Cost [Member] | Constructions and machinery in-progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 3,434,000 3,293,000
Additions 1,370,000 181,000
Translation adjustments (4,000) (40,000)
Balance at end of year $ 4,800,000 $ 3,434,000