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Stock-Based Compensation - Summary of Nucor's Restricted Stock Activity under AIP and LTIP (Detail) - Restricted Stock Awards and Units [Member] - AIP and LTIP [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested at beginning of year, Shares 91 67 63
Granted, Shares 256 172 123
Vested, Shares (217) (148) (116)
Canceled, Shares     (3)
Unvested at end of year, Shares 130 91 67
Unvested at beginning of year, Grant Date Fair Value $ 54.50 $ 45.77 $ 48.07
Granted, Grant Date Fair Value 67.68 60.62 44.03
Vested, Grant Date Fair Value 64.95 51.72 45.16
Canceled, Grant Date Fair Value     45.75
Unvested at end of year, Grant Date Fair Value $ 62.97 $ 54.50 $ 45.77