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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]        
Other changes $ 26,663,000us-gaap_GoodwillOtherChanges $ (4,863,000)us-gaap_GoodwillOtherChanges    
Intangible asset amortization expense 72,400,000us-gaap_AmortizationOfIntangibleAssets 74,400,000us-gaap_AmortizationOfIntangibleAssets 73,000,000us-gaap_AmortizationOfIntangibleAssets  
Future amortization expense, in 2015 73,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths     73,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Future amortization expense, in 2016 71,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo     71,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Future amortization expense, in 2017 69,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree     69,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Future amortization expense, in 2018 66,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour     66,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Future amortization expense, in 2019 63,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive     63,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Impairment of goodwill 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss  
Increase in Goodwill Due to Correction of Deferred Tax [Member]        
Finite And Indefinite Lived Intangible Assets [Line Items]        
Other changes       $ 26,400,000us-gaap_GoodwillOtherChanges
/ us-gaap_RegulatoryAssetAxis
= nue_ChangeInGoodwillDueToCorrectionOfDeferredTaxMember
Minimum [Member]        
Finite And Indefinite Lived Intangible Assets [Line Items]        
Intangible assets, useful life 5 years      
Maximum [Member]        
Finite And Indefinite Lived Intangible Assets [Line Items]        
Intangible assets, useful life 22 years