Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 30, 2024 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 3,968,847
Acquisitions	(8,366)
Translation	(4,419)
Balance, end of period	3,956,062
Steel Mills [Member]
Goodwill [Line Items]
Balance, beginning of period	675,186
Balance, end of period	675,186
Steel Products [Member]
Goodwill [Line Items]
Balance, beginning of period	2,514,172
Translation	(4,419)
Balance, end of period	2,509,753
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	779,489
Acquisitions	(8,366)
Balance, end of period	$ 771,123