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Other (income) expenses, net (Schedule of Other Income (Expenses) Net) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
Cancellation of balances $ 0 $ 87,241 $ 786
Land treatments in Pacific Steel, Inc. 2,708 3,362 8,922
Attorney's fees 0 54,520 0
Bad debt estimate 0 5,320 0
Other expenses 2,708 150,443 9,708
Sale of scrap (232,157) (3,182) (9,865)
Recovery of losses 0 (6,397) (6,405)
Update of balances in favor in taxes (256,698) 0 (2,699)
Agreements with clients (27,869)    
Other income (32,733) (4,282) (5,791)
Other income (549,457) (13,861) (24,760)
Other (income) and other expenses, net $ (546,749) $ 136,582 $ (15,052)