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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses by nature [abstract]      
Raw materials and consumables $ 15,565,242 $ 11,268,400 $ 10,968,932
Electrical energy 2,536,387 2,123,658 1,767,149
Ferroalloys 1,973,586 1,734,914 1,403,206
Refractories 613,563 492,781 466,815
Oxygen 279,272 213,838 211,051
Electrodes 1,463,091 419,741 276,473
Gas and fuels 766,163 612,605 518,072
Labor 3,181,556 2,699,414 2,931,108
Operation materials 954,415 1,000,752 890,002
Depreciation and amortization 1,112,418 1,465,759 1,429,380
Maintenance 2,243,255 2,586,507 2,565,772
Other expenses 954,379 615,100 625,120
Total expense 31,643,327 25,233,469 24,053,080
Cost of sales 30,563,315 23,994,526 22,775,593
Administrative expenses $ 1,080,012 $ 1,238,943 $ 1,277,487