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Equity Investments - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Oct. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Sheet
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Schedule of Equity Method Investments [Line Items]              
Equity method investment   $ 746,600 $ 663,400 $ 746,600      
Amortization expense due to fair value step-up     73,862 74,260 $ 72,423    
Distributions from affiliates     40,602 15,132 53,738    
Duferdofin Nucor S.r.l. [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investment   258,200 $ 256,600 258,200      
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     $ 102,000        
Basis difference due to the step-up to fair value of certain assets and liabilities     154,600        
Step-up to fair value of equity method investment, portion related to identification of goodwill     81,200        
Amortization expense due to fair value step-up     8,800 8,800 10,500    
Due from related parties, noncurrent   38,200 $ 36,900 38,200   € 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 notes payable with parent company, maturity date     Jan. 31, 2019        
Impairment charge against investment   153,000          
NuMit LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investment   314,500 $ 325,100 314,500      
Period used for lag basis, in months     1 month        
Equity method investment, ownership percentage     50.00%     50.00%  
Distributions from affiliates     $ 38,600 13,100 $ 52,700    
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]              
Period used for lag basis, in months     1 month        
Equity method investment sold, carrying amount     $ 133,300 135,900      
Equity Method Investment Sales Price $ 135,000            
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     129,100     € 122.5  
Total amount outstanding under equity method investments credit facilities   $ 129,800 $ 112,700 $ 129,800   € 107.0 € 119.0
Guarantor obligation percentage of exposure in case of default     50.00%     50.00%  
Line of credit facility, maturity period     Oct. 12, 2018