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Transactions and balances with related parties (Schedule of Transactions with Related Parties) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Holding company      
Interest expense $ 7,346
Interest income 41,034 265,200 210,514
Management staff      
Administrative services expenditures 199,488 23,548 23,494
Other related parties      
Sales 188,082 249,560 20,375
Purchases 27,507 438,052 372,759
Direct short-term benefits [1] $ 90,562 $ 106,631 $ 90,600
[1] Correspond to the salaries, allowances and bonuses paid to the executives of Simec.