Stock-Based Compensation - Summary of Nucor's Restricted Stock Activity under AIP and LTIP (Detail) - Restricted Stock Units and Restricted Stock Awards [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at beginning of year, Shares	209	107	127
Granted, Shares	414	465	262
Vested, Shares	(406)	(356)	(273)
Canceled, Shares	(7)	(7)	(9)
Unvested at end of year, Shares	210	209	107
Unvested at beginning of year, Grant Date Fair Value	$ 108.55	$ 57.17	$ 49.94
Granted, Grant Date Fair Value	171.38	128.62	65.61
Vested, Grant Date Fair Value	152.68	119.29	62.17
Canceled, Grant Date Fair Value	154.05	113.86	48.75
Unvested at end of year, Grant Date Fair Value	$ 145.55	$ 108.55	$ 57.17