Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	6 Months Ended
	Jul. 01, 2023 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 3,920,060
Acquisitions	(3,740)
Translation	9,877
Balance, end of period	3,926,197
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	2,510,045
Acquisitions	(3,740)
Translation	9,877
Balance, end of period	2,516,182
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	734,829
Balance, end of period	$ 734,829