Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 8,709,980	$ 10,493,282
Earnings (losses) before income taxes and noncontrolling interests	1,596,784	2,898,115
Total assets	32,246,390		$ 32,479,210
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	4,979,257	6,518,609
Earnings (losses) before income taxes and noncontrolling interests	838,388	2,578,854
Total assets	14,053,600		14,157,229
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	3,275,997	3,323,088
Earnings (losses) before income taxes and noncontrolling interests	970,802	684,867
Total assets	11,318,754		12,087,145
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	454,726	651,585
Earnings (losses) before income taxes and noncontrolling interests	58,140	95,853
Total assets	3,466,854		3,383,114
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	1,163,632	1,593,258
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	100,361	134,706
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	3,170,892	3,546,519
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales	(4,434,885)	(5,274,483)
Earnings (losses) before income taxes and noncontrolling interests	(270,546)	$ (461,459)
Total assets	$ 3,407,182		$ 2,851,722