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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, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year $ 16,737,595 $ 16,971,000
Depreciation expense 1,441,021 1,098,749
Balance at end of year 15,950,352 16,737,595
Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 4,056,000 3,625,000
Balance at end of year 4,227,000 4,056,000
Machinery and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 9,879,000 7,187,000
Balance at end of year 9,255,000 9,879,000
Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 76,000 78,000
Balance at end of year 75,000 76,000
Furniture, mixtures and computer equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 64,000 64,000
Balance at end of year 63,000 64,000
Accumulated amortization [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 20,291,000 19,591,000
Depreciation expense 1,441,000 1,099,000
Translation effects 30,000 (399,000)
Balance at end of year 21,762,000 20,291,000
Accumulated amortization [Member] | Buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 1,082,000 1,055,000
Depreciation expense 152,000 30,000
Translation effects (21,000) (3,000)
Balance at end of year 1,213,000 1,082,000
Accumulated amortization [Member] | Machinery and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 19,047,000 18,380,000
Depreciation expense 1,283,000 1,063,000
Translation effects 52,000 (396,000)
Balance at end of year 20,382,000 19,047,000
Accumulated amortization [Member] | Transportation equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning of year 85,000 81,000
Depreciation expense 2,000 4,000
Translation effects (1,000) 0
Balance at end of year 86,000 85,000
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 77,000 75,000
Depreciation expense 4,000 2,000
Translation effects 0 0
Balance at end of year $ 81,000 $ 77,000