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Stockholders' equity (Narrative) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Mar. 10, 2020
Dec. 31, 2020
Dec. 31, 2019
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   $ 5,000,000  
Treasury Shares   34,465,803 33,729,926
Treasury amount   2,101,652 $ 2,059,668
Profit (loss) on treasury shares   $ 0  
Fixed capital, Shares   90,850,000 90,850,000
Variable capital, Shares   406,859,000 406,859,000
Dividend paid $ 1,990,000 $ 1,990,000  
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