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Stockholders' equity (Narrative) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 31,066,207 3,662,564
Treasury amount 1,903,610 267,553
Profit (loss) on treasury shares $ 4,239 $ 22,842
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