Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 10,493,282	$ 7,017,140
Earnings (losses) before income taxes and noncontrolling interests	2,898,115	1,298,246
Total assets	28,632,868		$ 25,823,072
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	6,518,609	4,608,777
Earnings (losses) before income taxes and noncontrolling interests	2,578,854	1,314,974
Total assets	14,458,171		13,235,463
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	3,323,088	1,810,055
Earnings (losses) before income taxes and noncontrolling interests	684,867	211,812
Total assets	8,014,507		7,845,010
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	651,585	598,308
Earnings (losses) before income taxes and noncontrolling interests	95,853	223,235
Total assets	3,709,087		3,870,806
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	1,593,258	1,225,113
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	134,706	71,219
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	3,546,519	3,646,195
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales	(5,274,483)	(4,942,527)
Earnings (losses) before income taxes and noncontrolling interests	(461,459)	$ (451,775)
Total assets	$ 2,451,103		$ 871,793