Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 9,523,256	$ 11,794,474	$ 18,233,236	$ 22,287,756
Earnings (losses) before income taxes and noncontrolling interests	2,049,782	3,490,402	3,646,566	6,388,517
Total assets	33,379,916		33,379,916		$ 32,479,210
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	5,565,772	7,256,067	10,545,029	13,774,676
Earnings (losses) before income taxes and noncontrolling interests	1,403,547	2,815,723	2,241,935	5,394,577
Total assets	14,828,076		14,828,076		14,157,229
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	3,442,862	3,842,948	6,718,859	7,166,036
Earnings (losses) before income taxes and noncontrolling interests	1,010,789	1,129,932	1,981,591	1,814,799
Total assets	11,487,936		11,487,936		12,087,145
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	514,622	695,459	969,348	1,347,044
Earnings (losses) before income taxes and noncontrolling interests	138,411	263,598	196,551	359,451
Total assets	3,292,148		3,292,148		3,383,114
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	1,361,066	1,763,563	2,524,698	3,356,821
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	100,257	117,289	200,618	251,995
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	3,588,629	4,145,690	6,759,521	7,692,209
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales	(5,049,952)	(6,026,542)	(9,484,837)	(11,301,025)
Earnings (losses) before income taxes and noncontrolling interests	(502,965)	$ (718,851)	(773,511)	$ (1,180,310)
Corporate/eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 3,771,756		$ 3,771,756		$ 2,851,722