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Amount of assets acquired at the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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

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The amount of inventory recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions and Dispositions - Estimated Fair Values of Assets Acquired and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 08, 2014	Jun. 20, 2012
Business Acquisition [Line Items]
Goodwill	$ 2,068,664us-gaap_Goodwill	$ 1,973,608us-gaap_Goodwill	$ 2,004,538us-gaap_Goodwill
Gallatin Steel Company [Member]
Business Acquisition [Line Items]
Cash				48,957
Accounts receivable				82,291
Inventory				101,692
Other current assets				5,117
Property, plant and equipment				483,007
Goodwill				98,505
Other intangible assets				67,150
Other assets				2,762
Total assets acquired				889,481
Current liabilities				105,816
Long-term debt				2,093
Deferred credits and other liabilities				2,500
Total liabilities assumed				110,409
Net assets acquired				779,072
Skyline Steel LLC [Member]
Business Acquisition [Line Items]
Accounts receivable					128,004
Inventory					260,473
Other current assets					4,410
Property, plant and equipment					70,100
Goodwill					138,579
Other intangible assets					215,600
Total assets acquired					817,166
Current liabilities					137,654
Deferred credits and other liabilities					4,078
Total liabilities assumed					141,732
Net assets acquired					$ 675,434