Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	6 Months Ended
	Jul. 02, 2022 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 2,827,344
Acquisitions	1,124,187
Other	(19,983)
Translation	(2,045)
Balance, end of period	3,929,503
Steel Mills [Member]
Goodwill [Line Items]
Balance, beginning of period	613,175
Acquisitions	62,011
Balance, end of period	675,186
Steel Products [Member]
Goodwill [Line Items]
Balance, beginning of period	1,439,874
Acquisitions	1,062,176
Translation	(2,045)
Balance, end of period	2,500,005
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	774,295
Other	(19,983)
Balance, end of period	$ 754,312