Total Amount outstanding under equity method investment's applicable credit facilities

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- Definition

The equity method investment's available credit facilities subject to guarantee.

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No definition available.

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- Definition

Guarantor Obligation Percentage Of Exposure In Case Of Default

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No definition available.

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- Definition

Interest rate per year in excess of Euribor as of date of the note.

+ References

No definition available.

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- Definition

Basis points per year in excess of LIBOR as of date of note.

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No definition available.

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- Definition

Line of credit extended to joint venture

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No definition available.

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- Definition

Line of Credit Extended To Joint Venture Amount Outstanding

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No definition available.

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- Definition

Line of credit facility extended to joint venture interest rate.

+ References

No definition available.

+ Details

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- Definition

The number of sheet processing facilities operated by equity method investment.

+ References

No definition available.

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- Definition

Period Used For Lag Basis, In Months

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No definition available.

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- Definition

Step-up to fair value of equity method investment, portion related to identification of goodwill.

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No definition available.

+ Details

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- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Topic 210

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-Subparagraph (SX 210.5-02.11)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 11

-Article 5

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(3)

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a(3)

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 19

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

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-Topic 323

-SubTopic 10

-Section 35

-Paragraph 32

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

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-Topic 323

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-Publisher AICPA

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-Subparagraph a (1)

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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- Definition

This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

+ References

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Balance Type:	credit
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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.4-08.(k)(1))

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-Glossary Related Parties

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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Date of maturity or expiration of arrangements with a related party (for example, but not limited to, leasing and debt arrangements between related parties), in CCYY-MM-DD format.

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No definition available.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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No definition available.

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Equity Investments - Additional Information (Detail)	6 Months Ended			1 Months Ended			3 Months Ended			6 Months Ended							6 Months Ended		6 Months Ended
Equity Investments - Additional Information (Detail)	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)	Nov. 30, 2012 Hunter Ridge Energy Services LLC [Member]	Jun. 29, 2013 Hunter Ridge Energy Services LLC [Member] USD ($)	Dec. 31, 2012 Hunter Ridge Energy Services LLC [Member] USD ($)	Jun. 29, 2013 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 29, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 30, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 29, 2013 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 29, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 29, 2013 Duferdofin Nucor S.R.L. [Member] EUR (€)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] EUR (€)	Jun. 29, 2013 Duferdofin Nucor S.R.L. [Member] EURO [Member] EUR (€)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] EURO [Member] EUR (€)	Jun. 29, 2013 NuMit [Member] USD ($) Sheet	Dec. 31, 2012 NuMit [Member] USD ($)	Jun. 29, 2013 Steel Technologies LLC [Member] USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 886,200,000		$ 855,900,000		$ 130,600,000	$ 95,400,000	$ 440,700,000			$ 440,700,000			$ 454,100,000				$ 297,300,000	$ 288,400,000
Period used for lag basis, in months				1 month						1 month							1 month
Equity method investment, ownership percentage				50.00%			50.00%			50.00%							50.00%		100.00%
Equity method investments, share of net assets							48,700,000			48,700,000
Step-up to fair value of certain assets and liabilities							392,000,000			392,000,000
Step-up to fair value of equity method investment, portion related to identification of goodwill							314,900,000
Amortization expense and other purchase accounting adjustments due to fair value step-up	37,575,000	33,122,000					2,800,000	2,800,000		5,700,000	5,600,000
Due from related parties, noncurrent							45,600,000			45,600,000		35,000,000		35,000,000
Notes receivable, related parties, interest rate										1.69%									1.18%
Interest rate per year in excess of Euribor as of date of the notes	1.00%
Equity method investment's credit facilities with parent company, maturity date										Jan. 31, 2016							Oct. 21, 2014
Equity method investment's credit facilities, amount							159,800,000			159,800,000					122,500,000
Total amount outstanding under equity method investment's credit facilities							140,800,000			140,800,000			134,800,000		108,000,000	102,000,000
Line of credit facility, maturity period										Apr. 26, 2016									Apr. 01, 2014
Guarantor obligation percentage of exposure in case of default							50.00%			50.00%
Number of sheet processing facilities operated by Steel Technologies																	23
Investment in joint venture																	221,300,000
Notes receivable, related parties																			40,000,000
Basis points in excess of LIBOR on note receivable from related party																			0.90%
Line of credit extended to joint venture, amount outstanding																			16,500,000
Line of credit extended to joint venture																			100,000,000
Line of credit facility extended to joint venture, interest rate																			1.21%
Impairment charge against investment in Duferdofin Nucor									$ 30,000,000