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Stock-Based Compensation - Summary of Nucor's Restricted Stock Unit Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jul. 05, 2014
Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at beginning of year, Shares 1,122
Granted, Shares 655
Vested, Shares (704)
Canceled, Shares (8)
Unvested at end of period, Shares 1,065
Unvested at beginning of year, Grant Date Fair Value $ 42.51
Granted, Grant Date Fair Value $ 50.63
Vested, Grant Date Fair Value $ 44.51
Canceled, Grant Date Fair Value $ 40.42
Unvested at end of period, Grant Date Fair Value $ 46.19
Restricted Stock Units and stock options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for future grants 11,868