Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	9 Months Ended
	Oct. 01, 2022 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 2,827,344
Acquisitions	1,145,211
Other	(39,466)
Translation	(15,637)
Balance, end of period	3,917,452
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	1,083,200
Translation	(15,637)
Balance, end of period	2,507,437
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	774,295
Other	(39,466)
Balance, end of period	$ 734,829