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Segments - Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 04, 2015 | Jul. 05, 2014 | Jul. 04, 2015 | Jul. 05, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 4,357,609 | $ 5,291,075 | $ 8,757,049 | $ 10,399,519 |
Earnings (loss) before income taxes and noncontrolling interests | 216,222 | 241,865 | 335,267 | 449,366 |
Total assets | 15,068,177 |  | 15,068,177 |  | $ 15,615,927
Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (loss) before income taxes and noncontrolling interests | 198,500 | 368,138 | 415,628 | 685,935 |
Total assets | 7,900,573 |  | 7,900,573 |  | 8,528,623
Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (loss) before income taxes and noncontrolling interests | 70,636 | 42,612 | 103,094 | 44,332 |
Total assets | 2,708,522 |  | 2,708,522 |  | 2,731,320
Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (loss) before income taxes and noncontrolling interests | (38,104) | (9,635) | (79,601) | (1,276) |
Total assets | 3,590,917 |  | 3,590,917 |  | 3,858,254
Net Sales to External Customers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 4,357,609 | 5,291,075 | 8,757,049 | 10,399,519 |
Net Sales to External Customers [Member] | Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 2,968,644 | 3,674,140 | 6,021,983 | 7,281,904 |
Net Sales to External Customers [Member] | Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,015,646 | 1,035,923 | 1,937,030 | 1,910,092 |
Net Sales to External Customers [Member] | Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 373,319 | 581,012 | 798,036 | 1,207,523 |
Intercompany Eliminations [Member] | Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 577,271 | 742,200 | 1,152,254 | 1,451,066 |
Intercompany Eliminations [Member] | Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 21,020 | 26,542 | 40,517 | 48,042 |
Intercompany Eliminations [Member] | Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,687,941 | 2,443,492 | 3,520,859 | 4,971,498 |
Intercompany Eliminations [Member] | Corporate/Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (2,286,232) | (3,212,234) | (4,713,630) | (6,470,606) |
Earnings (loss) before income taxes and noncontrolling interests | (14,810) | $ (159,250) | (103,854) | $ (279,625) |
Total assets | $ 868,165 |  | $ 868,165 |  | $ 497,730

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