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Equity Investments - Additional Information (Detail)
€ in Millions
3 Months Ended
Apr. 02, 2016
USD ($)
Sheet
Dec. 31, 2015
USD ($)
Apr. 04, 2015
USD ($)
Apr. 02, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 737,400,000 $ 746,600,000      
Amortization expense due to fair value step-up 18,112,000   $ 18,655,000    
Distributions from affiliates 36,015,000        
Duferdofin Nucor S.r.l. [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 275,800,000 258,200,000      
Period used for lag basis, in months 1 month        
Equity method investment, ownership percentage 50.00%     50.00%  
Equity method investments, share of net assets $ 96,600,000        
Basis difference due to the step-up to fair value of certain assets and liabilities 179,200,000        
Step-up to fair value of equity method investment, portion related to identification of goodwill 87,800,000        
Amortization expense due to fair value step-up 2,200,000   2,200,000    
Due from related parties, noncurrent $ 39,800,000 38,200,000   € 35.0 € 35.0
Notes receivable, related parties, interest rate 1.14%        
Interest rate per year in excess of Euribor as of date of the notes 1.00%        
Equity method investments note payable with parent company, maturity date Jan. 31, 2019        
Impairment charge against investment   153,000,000      
NuMit LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 288,200,000 314,500,000      
Period used for lag basis, in months 1 month        
Equity method investment, ownership percentage 50.00%     50.00%  
Distributions from affiliates $ 36,000,000   $ 0    
Steel Technologies LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 100.00%     100.00%  
Number of sheet processing facilities operated by Steel Technologies | Sheet 25        
Hunter Ridge Energy Services LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 135,300,000 135,900,000      
Period used for lag basis, in months 1 month        
Equity method investment, ownership percentage 50.00%     50.00%  
Facility A [Member] | Duferdofin Nucor S.r.l. [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments credit facilities, amount $ 139,500,000     € 122.5  
Total amount outstanding under equity method investments credit facilities $ 133,200,000 $ 129,800,000   € 117.0 € 119.0
Guarantor obligation percentage of exposure in case of default 50.00%     50.00%  
Line of credit facility, maturity period Oct. 12, 2018