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Equity Investments - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended
Apr. 01, 2017
USD ($)
Sheet
Apr. 02, 2016
USD ($)
Apr. 01, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 660,000     $ 663,400  
Distributions from affiliates 30,249 $ 36,015      
Amortization expense due to fair value step-up 22,368 18,112      
NuMit LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 304,900     325,100  
Equity method investment, ownership percentage 50.00%   50.00%    
Period used for lag basis, in months 1 month        
Distributions from affiliates $ 30,200 36,000      
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        
Duferdofin Nucor S.r.l. [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment $ 258,600     256,600  
Equity method investment, ownership percentage 50.00%   50.00%    
Period used for lag basis, in months 1 month        
Equity method investments, share of net assets $ 103,400        
Basis difference due to the step-up to fair value of certain assets and liabilities 155,200        
Step-up to fair value of equity method investment, portion related to identification of goodwill 82,300        
Amortization expense due to fair value step-up 2,100 $ 2,200      
Due from related parties, noncurrent $ 37,400   € 35.0 36,900 € 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 notes payable with parent company, maturity date Jan. 31, 2019        
Facility A [Member] | Duferdofin Nucor S.r.l. [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments credit facilities, amount $ 130,800   122.5    
Total amount outstanding under equity method investments credit facilities $ 109,500   € 102.5 $ 112,700 € 107.0
Guarantor obligation percentage of exposure in case of default 50.00%   50.00%    
Line of credit facility, maturity period Oct. 12, 2018