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Long-Term Debt (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Mar. 16, 2015
Mar. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Nov. 30, 2014
Jun. 15, 2014
Jun. 12, 2014
Feb. 13, 2015
Sep. 30, 2014
Mar. 31, 2013
Apr. 30, 2013
Long Term Debt                        
Total debt       $ 2,107,589,000us-gaap_LongTermDebt $ 3,024,166,000us-gaap_LongTermDebt              
Less current maturities       341,544,000us-gaap_LongTermDebtCurrent 46,460,000us-gaap_LongTermDebtCurrent              
Long-term debt       1,766,045,000us-gaap_LongTermDebtNoncurrent 2,977,706,000us-gaap_LongTermDebtNoncurrent              
Expenses recorded related to tender offer and early payoff of Senior Notes related to tender premiums, unamortized debt issuance cost write-off, and tender expenses 40,300,000stld_ExpensesRecordedRelatedToTenderOfferAndEarlyPayoff                      
Senior term loan                        
Long Term Debt                        
Total debt       247,500,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_TermLoanMember		 250,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_TermLoanMember		              
Debt issued         250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_TermLoanMember		 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_TermLoanMember		            
Senior notes due 2012                        
Long Term Debt                        
Debt extinguished 700,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotesDue2012Member		                      
Senior notes due 2016                        
Long Term Debt                        
Debt extinguished 500,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotesDue2016Member		                      
Term Loan maturing in 2016                        
Long Term Debt                        
Debt issued 275,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_TermLoanMaturingIn2016Member		                      
5.125% convertible senior notes                        
Long Term Debt                        
Total debt       287,493,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                
Stated interest rate (as a percent) 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		     5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		   5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		        
6 1/8% senior notes, due 2019                        
Long Term Debt                        
Total debt       400,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		 400,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		              
Stated interest rate (as a percent) 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		     6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		              
Debt issued 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.125PercentDue2019Member		                      
7 5/8% senior notes, due 2020                        
Long Term Debt                        
Total debt       350,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member		 350,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member		              
Stated interest rate (as a percent)       7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member		 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member		              
7 5/8% senior notes, due 2020 | Subsequent Event                        
Long Term Debt                        
Debt repurchased                 350,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
7 5/8% senior notes, due 2020 | Subsequent Event | Forecast                        
Long Term Debt                        
Redemption price of principal amount (as a percent)   103.831%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                    
Expenses recorded related to tender offer and early payoff of Senior Notes related to tender premiums, unamortized debt issuance cost write-off, and tender expenses     16,700,000stld_ExpensesRecordedRelatedToTenderOfferAndEarlyPayoff
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes7.625PercentDue2020Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                  
5.125% senior notes due 2021                        
Long Term Debt                        
Total debt         700,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.125PercentDue2021Member		              
Stated interest rate (as a percent)         5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.125PercentDue2021Member		         5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.125PercentDue2021Member		    
Debt issued                   700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.125PercentDue2021Member		    
6 3/8% Senior Notes, due 2022                        
Long Term Debt                        
Total debt       350,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.375PercentDue2022Member		 350,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.375PercentDue2022Member		              
Stated interest rate (as a percent) 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.375PercentDue2022Member		       6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.375PercentDue2022Member		              
Debt issued 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.375PercentDue2022Member		                      
5 1/4% Senior Notes due 2023                        
Long Term Debt                        
Total debt       400,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		 400,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		              
Stated interest rate (as a percent)       5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		           5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		  
Debt issued                     400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.25PercentDue2023Member		  
5.500% senior notes due 2024                        
Long Term Debt                        
Total debt         500,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.500PercentDue2024Member		              
Stated interest rate (as a percent)         5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.500PercentDue2024Member		         5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.500PercentDue2024Member		    
Debt issued                   500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes5.500PercentDue2024Member		    
6 3/4% senior notes, due 2015                        
Long Term Debt                        
Stated interest rate (as a percent)                     6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.75PercentDue2015Member		  
Debt repurchased                     301,700,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.75PercentDue2015Member		 198,300,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.75PercentDue2015Member
Expenses recorded related to tender offer and early payoff of Senior Notes related to tender premiums, unamortized debt issuance cost write-off, and tender expenses       2,600,000stld_ExpensesRecordedRelatedToTenderOfferAndEarlyPayoff
/ us-gaap_LongtermDebtTypeAxis
= stld_SeniorNotes6.75PercentDue2015Member		                
Other obligations                        
Long Term Debt                        
Total debt       $ 72,596,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_OtherDebtMember		 $ 74,166,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stld_OtherDebtMember