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Stockholders' equity (Narrative) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Percentage of legal reserve 5.00%  
Legal reserve amount $ 484,046 $ 484,046
Percentage of nominal capital 20.00%  
Reserve   3,000,000
Increase reserve amount   5,000,000
Treasury Shares $ 33,729,926 31,066,207
Treasury amount 2,059,668 1,903,610
Profit (loss) on treasury shares $ 0 $ 4,239
Fixed capital, Shares 90,850,000 90,850,000
Variable capital, Shares 406,859,000 406,859,000
Class I Shares [Member]    
Statement Line Items [Line Items]    
Fixed capital, Shares 90,850,050  
Class II Shares [Member]    
Statement Line Items [Line Items]    
Fixed capital, Shares 406,859,164