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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
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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

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