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Equity Investments - Additional Information (Detail)
€ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
Sheet
Oct. 03, 2015
USD ($)
Dec. 31, 2015
USD ($)
Oct. 01, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Schedule of Equity Method Investments [Line Items]                
Equity method investment $ 659,500,000 $ 746,600,000   $ 659,500,000   $ 746,600,000    
Amortization expense due to fair value step-up       54,066,000 $ 55,673,000      
Distributions from affiliates       38,474,000 14,149,000      
Duferdofin Nucor S.r.l. [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment $ 277,700,000 258,200,000   $ 277,700,000   258,200,000    
Period used for lag basis, in months       1 month        
Equity method investment, ownership percentage 50.00%     50.00%     50.00%  
Equity method investments, share of net assets $ 103,400,000     $ 103,400,000        
Basis difference due to the step-up to fair value of certain assets and liabilities 174,300,000     174,300,000        
Step-up to fair value of equity method investment, portion related to identification of goodwill       86,400,000        
Amortization expense due to fair value step-up 2,200,000   $ 2,200,000 6,600,000 6,600,000      
Due from related parties, noncurrent 39,200,000 38,200,000   $ 39,200,000   38,200,000 € 35.0 € 35.0
Notes receivable, related parties, interest rate       0.94%        
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 $ 312,900,000 314,500,000   $ 312,900,000   314,500,000    
Period used for lag basis, in months       1 month        
Equity method investment, ownership percentage 50.00%     50.00%     50.00%  
Distributions from affiliates $ 500,000   $ 0 $ 37,500,000 $ 12,100,000      
Steel Technologies LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage 100.00%     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]                
Period used for lag basis, in months       1 month        
Equity method investment sold, carrying amount       $ 133,300,000   135,900,000    
Equity Method Investment Sales Price       135,000,000        
Equity method investment ownership percentage, percentage of investee's ownership interest sold 50.00%              
Facility A [Member] | Duferdofin Nucor S.r.l. [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investments credit facilities, amount $ 137,300,000     137,300,000     € 122.5  
Total amount outstanding under equity method investments credit facilities $ 122,200,000 $ 129,800,000   $ 122,200,000   $ 129,800,000 € 109.0 € 119.0
Guarantor obligation percentage of exposure in case of default 50.00%     50.00%     50.00%  
Line of credit facility, maturity period       Oct. 12, 2018