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Stock-Based Compensation - Summary of Nucor's Restricted Stock Awards and Units Under AIP And LTIP (Detail) (AIP and LTIP [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 28, 2013
AIP and LTIP [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at beginning of year, Shares 72
Granted, Shares 122
Vested, Shares (121)
Canceled, Shares   
Unvested at end of period, Shares 73
Shares reserved for future grants 1,238
Unvested at beginning of year, Grant Date Fair Value $ 43.72
Granted, Grant Date Fair Value $ 47.36
Vested, Grant Date Fair Value $ 46.32
Canceled, Grant Date Fair Value   
Unvested at end of period, Grant Date Fair Value $ 45.49