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Intangible and other long-term assets (Narrative) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2009
Disclosure of detailed information about intangible assets [line items]        
Amortization of intangible assets $ 9,880 $ 10,087 $ 125,384  
Trademark San 42 [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets impairment loss       $ 16,000
Goodwill [Member]        
Disclosure of detailed information about intangible assets [line items]        
Goodwill impairment loss       $ 2,352,000