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Cost of sales and expenses by their nature (Schedule of Cost of Sales and Administration Expenses) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expenses by nature [abstract]      
Raw materials and consumables $ 16,411,788 $ 15,565,242 $ 11,268,400
Electrical energy 3,303,640 2,536,387 2,123,658
Ferroalloys 2,137,671 1,973,586 1,734,914
Refractories 707,214 613,563 492,781
Oxygen 276,648 279,272 213,838
Electrodes 1,293,096 1,463,091 419,741
Gas and fuels 962,001 766,163 612,605
Labor 2,042,433 3,181,556 2,699,414
Operation materials 919,893 954,415 1,000,752
Depreciation and amortization 1,108,629 1,112,418 1,465,759
Maintenance 2,221,595 2,243,255 2,586,507
Other expenses 319,958 954,379 615,100
Total expense 31,704,566 31,643,327 25,233,469
Cost of sales 30,067,141 30,563,315 23,994,526
Administrative expenses $ 1,637,425 $ 1,080,012 $ 1,238,943