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Stock-Based Compensation - Summary of Nucor's RSU Activity (Detail) - Restricted Stock Units [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at beginning of year, Shares | shares 1,071
Granted, Shares | shares 1,013
Vested, Shares | shares (762)
Canceled, Shares | shares (10)
Unvested at end of year, Shares | shares 1,312
Unvested at beginning of year, Grant Date Fair Value | $ / shares $ 52.62
Granted, Grant Date Fair Value | $ / shares 65.80
Vested, Grant Date Fair Value | $ / shares 59.20
Canceled, Grant Date Fair Value | $ / shares 53.50
Unvested at end of year, Grant Date Fair Value | $ / shares $ 58.97