Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Dec. 31, 2021	Oct. 02, 2021	Jul. 03, 2021	Apr. 03, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 8,723,956	$ 10,500,755	$ 11,794,474	$ 10,493,282	$ 10,364,412	$ 10,313,223	$ 8,789,164	$ 7,017,140	$ 41,512,467	$ 36,483,939	$ 20,139,658
Depreciation expense									826,692	735,406	702,110
Amortization expense									234,942	129,157	83,356
Earnings (loss) before income taxes and noncontrolling interests									10,244,844	9,200,858	835,538
Total assets	32,479,210				25,823,072				32,479,210	25,823,072	20,125,394
Capital expenditures									1,952,465	1,700,364	1,527,116
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales									24,189,858	24,145,396	12,109,307
Depreciation expense									529,005	465,733	449,289
Amortization expense									7,829	7,829	7,334
Earnings (loss) before income taxes and noncontrolling interests									7,199,087	9,735,020	720,151
Total assets	14,157,229				13,235,463				14,157,229	13,235,463	9,708,260
Capital expenditures									1,453,277	1,336,276	1,238,132
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales									15,060,328	9,727,943	6,623,068
Depreciation expense									115,501	99,248	93,184
Amortization expense									199,379	93,160	47,773
Earnings (loss) before income taxes and noncontrolling interests									4,093,105	1,291,450	690,547
Total assets	12,087,145				7,845,010				12,087,145	7,845,010	4,461,042
Capital expenditures									267,128	187,152	135,512
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales									2,262,281	2,610,600	1,407,283
Depreciation expense									171,060	159,886	150,474
Amortization expense									27,734	28,168	28,249
Earnings (loss) before income taxes and noncontrolling interests									496,823	549,956	23,621
Total assets	3,383,114				3,870,806				3,383,114	3,870,806	3,324,489
Capital expenditures									181,680	128,765	125,213
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales									5,859,367	6,297,688	3,036,790
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales									547,219	360,063	248,477
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales									13,715,176	15,762,685	8,153,841
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales									(20,121,762)	(22,420,436)	(11,439,108)
Earnings (loss) before income taxes and noncontrolling interests									(1,544,171)	(2,375,568)	(598,781)
Total assets	$ 2,851,722				$ 871,793				2,851,722	871,793	2,631,603
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation expense									11,126	10,539	9,163
Capital expenditures									$ 50,380	$ 48,171	$ 28,259