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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, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year $ 16,970,832 $ 15,737,081
Depreciation expense 1,098,749 1,102,331
Balance at end of year 16,737,595 16,970,832
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 3,625,000 3,743,000
Balance at end of year 4,056,000 3,625,000
Machinery and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 7,187,000 7,331,000
Balance at end of year 6,489,000 7,187,000
Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 78,000 78,000
Balance at end of year 76,000 78,000
Furniture, mixtures and computer Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 64,000 57,000
Balance at end of year 64,000 64,000
Accumulated amortization [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 19,591,000 18,659,000
Depreciation expense 1,099,000 1,102,000
Translation effects (399,000) (170,000)
Balance at end of year 20,291,000 19,591,000
Accumulated amortization [Member] | Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 1,055,000 1,033,000
Depreciation expense 30,000 37,000
Translation effects (3,000) (15,000)
Balance at end of year 1,082,000 1,055,000
Accumulated amortization [Member] | Machinery and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 18,380,000 17,474,000
Depreciation expense 1,063,000 1,057,000
Translation effects (396,000) (151,000)
Balance at end of year 19,047,000 18,380,000
Accumulated amortization [Member] | Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 81,000 80,000
Depreciation expense 4,000 3,000
Translation effects 0 (2,000)
Balance at end of year 85,000 81,000
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 75,000 72,000
Depreciation expense 2,000 5,000
Translation effects 0 (2,000)
Balance at end of year $ 77,000 $ 75,000