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Significant events (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Mar. 10, 2020
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2018
USD ($)
shares
$ / shares
Sep. 30, 2018
MXN ($)
May 01, 2018
T
Dec. 31, 2012
MXN ($)
Disclosure of detailed information about business combination [line items]            
Amount of Consideration       $ 1,631,827   $ 2,452,028
Dividends paid $ 1,990,000 $ 1,990,000        
First Steel Mill of ArcelorMittal in Brazil [Member]            
Disclosure of detailed information about business combination [line items]            
Production capacity | T         600,000  
Second Steel Mill of ArcelorMittal in Brazil [Member]            
Disclosure of detailed information about business combination [line items]            
Production capacity | T         120,000  
SimRep Corporation [Member]            
Disclosure of detailed information about business combination [line items]            
Shares acquired by subsidiary | shares     83,862      
Percentage of capital stock acquired by subsidiary     99.41%      
Number of common shares acquired per share price | $ / shares     $ 3,454      
Amount of Consideration     $ 289,660