Segments - Schedule of Net Sale by Product to External Customers (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 to external customers	$ 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
Sheet [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									11,437,799	12,675,679	5,450,507
Bar [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									7,031,798	6,039,187	3,821,158
Structural [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									2,928,072	2,597,768	1,526,283
Plate [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									2,792,188	2,832,762	1,311,360
Tubular Products [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									1,944,532	2,194,732	1,113,581
Rebar Fabrication [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									2,205,960	1,794,658	1,708,441
Joist [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									2,958,235	1,351,235	758,853
Deck [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									2,392,438	1,167,162	717,276
Other Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									5,559,164	3,220,155	2,324,916
Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales to external customers									$ 2,262,281	$ 2,610,601	$ 1,407,283