Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 10,500,755	$ 10,313,223	$ 32,788,511	$ 26,119,527
Earnings (losses) before income taxes and noncontrolling interests	2,322,922	2,869,107	8,711,439	6,193,101
Total assets	32,072,704		32,072,704		$ 25,823,072
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	5,908,153	6,862,133	19,682,829	17,380,819
Earnings (losses) before income taxes and noncontrolling interests	1,287,855	3,116,539	6,682,432	6,606,320
Total assets	14,678,511		14,678,511		13,235,463
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	4,087,107	2,744,279	11,253,143	6,795,441
Earnings (losses) before income taxes and noncontrolling interests	1,196,845	368,595	3,011,644	839,737
Total assets	12,556,428		12,556,428		7,845,010
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	505,495	706,811	1,852,539	1,943,267
Earnings (losses) before income taxes and noncontrolling interests	279,189	161,870	638,640	505,248
Total assets	3,616,466		3,616,466		3,870,806
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	1,486,378	1,840,007	4,843,199	4,561,418
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	139,146	93,910	391,141	245,523
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	3,690,120	4,355,702	11,382,329	12,011,705
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales	(5,315,644)	(6,289,619)	(16,616,669)	(16,818,646)
Earnings (losses) before income taxes and noncontrolling interests	(440,967)	$ (777,897)	(1,621,277)	$ (1,758,204)
Total assets	$ 1,221,299		$ 1,221,299		$ 871,793