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Segments - Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Oct. 03, 2020 | Jul. 04, 2020 | Apr. 04, 2020 | Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 5,260,055 | $ 4,927,960 | $ 4,327,306 | $ 5,624,337 | $ 5,131,746 | $ 5,464,502 | $ 5,895,986 | $ 6,096,624 | $ 20,139,658 | $ 22,588,858 | $ 25,067,279
Depreciation expense |  |  |  |  |  |  |  |  | 702,110 | 648,911 | 630,879
Amortization expense |  |  |  |  |  |  |  |  | 83,356 | 85,742 | 88,758
Earnings (loss) before income taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 835,538 | 1,782,807 | 3,229,391
Total assets | 20,125,394 |  |  |  | 18,344,666 |  |  |  | 20,125,394 | 18,344,666 | 17,920,588
Capital expenditures |  |  |  |  |  |  |  |  | 1,527,116 | 1,512,070 | 997,256
Operating Segments [Member] | Steel Mills [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 12,109,307 | 13,933,950 | 16,245,218
Depreciation expense |  |  |  |  |  |  |  |  | 449,290 | 401,609 | 378,146
Amortization expense |  |  |  |  |  |  |  |  | 7,334 | 8,624 | 9,400
Earnings (loss) before income taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 720,151 | 1,790,694 | 3,500,085
Total assets | 9,708,260 |  |  |  | 9,283,216 |  |  |  | 9,708,260 | 9,283,216 | 9,244,086
Capital expenditures |  |  |  |  |  |  |  |  | 1,238,132 | 1,133,089 | 720,310
Operating Segments [Member] | Steel Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,623,068 | 6,990,064 | 6,796,501
Depreciation expense |  |  |  |  |  |  |  |  | 93,184 | 85,276 | 80,681
Amortization expense |  |  |  |  |  |  |  |  | 47,773 | 49,914 | 51,997
Earnings (loss) before income taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 690,547 | 511,145 | 467,105
Total assets | 4,461,042 |  |  |  | 4,610,628 |  |  |  | 4,461,042 | 4,610,628 | 4,734,636
Capital expenditures |  |  |  |  |  |  |  |  | 135,511 | 93,848 | 88,585
Operating Segments [Member] | Raw Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,407,283 | 1,664,844 | 2,025,560
Depreciation expense |  |  |  |  |  |  |  |  | 150,474 | 151,124 | 161,666
Amortization expense |  |  |  |  |  |  |  |  | 28,249 | 27,204 | 27,361
Earnings (loss) before income taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 23,621 | (28,244) | 236,241
Total assets | 3,324,489 |  |  |  | 3,316,479 |  |  |  | 3,324,489 | 3,316,479 | 3,492,126
Capital expenditures |  |  |  |  |  |  |  |  | 125,213 | 244,818 | 169,926
Intercompany Eliminations [Member] | Steel Mills [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,036,790 | 3,304,437 | 3,924,160
Intercompany Eliminations [Member] | Steel Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 248,477 | 233,728 | 207,003
Intercompany Eliminations [Member] | Raw Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,153,841 | 8,784,397 | 11,460,645
Corporate and Eliminations Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (11,439,108) | (12,322,562) | (15,591,808)
Earnings (loss) before income taxes and noncontrolling interests |  |  |  |  |  |  |  |  | (598,781) | (490,788) | (974,040)
Total assets | $ 2,631,603 |  |  |  | $ 1,134,343 |  |  |  | 2,631,603 | 1,134,343 | 449,740
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | 9,163 | 10,902 | 10,386
Capital expenditures |  |  |  |  |  |  |  |  | $ 28,259 | $ 40,315 | $ 18,435

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