Total amount outstanding under equity method investments applicable credit facilities.

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The equity method investments available credit facilities subject to guarantee.

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Guarantor obligation percentage of exposure in case of default.

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

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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

Amount of line of credit extended to joint venture.

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Amount of line of credit that was extended to joint venture that is outstanding.

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No definition available.

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- Definition

Line of credit facility extended to joint venture interest rate.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Period Used For Lag Basis

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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.

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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.

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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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-SubTopic 10

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

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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.

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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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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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-Topic 323

-SubTopic 10

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-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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-Name Accounting Standards Codification

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-Subparagraph (a)(1)

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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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-Subparagraph (SX 210.5-02.12)

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

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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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

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-Section 02

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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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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		6 Months Ended
Equity Investments - Additional Information (Detail)	Jul. 05, 2014 USD ($)	Jun. 29, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jul. 05, 2014 Hunter Ridge Energy Services LLC [Member] USD ($)	Dec. 31, 2013 Hunter Ridge Energy Services LLC [Member] USD ($)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] USD ($)	Jun. 29, 2013 Duferdofin Nucor S.r.l. [Member] USD ($)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] USD ($)	Jun. 29, 2013 Duferdofin Nucor S.r.l. [Member] USD ($)	Jun. 30, 2012 Duferdofin Nucor S.r.l. [Member] USD ($)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] EUR (€)	Dec. 31, 2013 Duferdofin Nucor S.r.l. [Member] USD ($)	Dec. 31, 2013 Duferdofin Nucor S.r.l. [Member] EUR (€)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] Standby Medium Long Term Credit Facility [Member] USD ($)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] Standby Medium Long Term Credit Facility [Member] EUR (€)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] Facility A [Member] USD ($)	Jul. 05, 2014 Duferdofin Nucor S.r.l. [Member] Facility A [Member] EUR (€)	Dec. 31, 2013 Duferdofin Nucor S.r.l. [Member] Facility A [Member] USD ($)	Dec. 31, 2013 Duferdofin Nucor S.r.l. [Member] Facility A [Member] EUR (€)	Jul. 05, 2014 NuMit LLC [Member] USD ($)	Dec. 31, 2013 NuMit LLC [Member] USD ($)	Jul. 05, 2014 Steel Technologies LLC [Member] USD ($) Sheet	Jul. 05, 2014 Steel Technologies LLC [Member] Notes Receivable One [Member] USD ($)	Jul. 05, 2014 Steel Technologies LLC [Member] Notes Receivable Two [Member] USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 937,300,000		$ 936,000,000	$ 136,700,000	$ 134,500,000	$ 456,700,000		$ 456,700,000				$ 465,400,000								$ 324,800,000	$ 318,400,000
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						55,900,000		55,900,000
Basis difference due to the step-up to fair value of certain assets and liabilities						400,800,000		400,800,000
Step-up to fair value of equity method investment, portion related to identification of goodwill								328,400,000
Amortization expense and other purchase accounting adjustments due to fair value step-up	36,265,000	37,575,000				2,700,000	2,800,000	5,400,000	5,700,000
Due from related parties, noncurrent						47,600,000		47,600,000			35,000,000	48,200,000	35,000,000
Notes receivable, related parties, interest rate								1.539%															1.13%	1.43%
Interest rate per year in excess of Euribor as of date of the notes								1.00%
Equity method investments note payable with parent company, maturity date								Jan. 31, 2016															Oct. 21, 2014	May 01, 2015
Equity method investments credit facilities, amount																	122,500,000
Total amount outstanding under equity method investments credit facilities														81,600,000	60,000,000	154,300,000	113,500,000	154,400,000	112,000,000
Line of credit facility, maturity period														Apr. 22, 2016	Apr. 22, 2016	Apr. 26, 2016	Apr. 26, 2016					Apr. 01, 2015
Guarantor obligation percentage of exposure in case of default														50.00%	50.00%
Number of sheet processing facilities operated by Steel Technologies																						25
Notes receivable, related parties																							40,000,000	44,000,000
Basis points in excess of LIBOR on note receivable from related party																							0.90%
Line of credit extended to joint venture																						60,000,000
Line of credit extended to joint venture, amount outstanding																						15,000,000
Line of credit extended to joint venture, interest rate																						1.36%
Impairment of equity method investments										$ 30,000,000