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Employee benefits (Schedule of Components of Net Cost of Benefits Plan to Employees) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Current service cost $ 2,179 $ 2,697  
Financial cost 4,242 4,025  
Past service cost (1,947) (1,481)  
Anticipated reduction obligations 296 (327)  
Actuarial losses (gains) recognized in the year 32,934 (17,928)  
Net cost of benefits 41,598 (9,910) $ (8,097)
Employees [Member]      
Disclosure of defined benefit plans [line items]      
Current service cost 2,179 2,839 5,697
Financial cost 4,242 4,025 6,637
Past service cost 1,947 1,481 (3,575)
Anticipated reduction obligations 296 (327) (12,517)
Actuarial losses (gains) recognized in the year 32,934 (17,928) (4,339)
Net cost of benefits $ 41,598 $ (9,910) $ (8,097)