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Subsequent Event (Details) (Subsequent event, USD $) In Millions, unless otherwise specified |  | 0 Months Ended
--- | --- | ---
Apr. 12, 2013 Metals USA | Apr. 30, 2013 Real estate holding company item
Subsequent Events |  |
Total transaction value | $ 1,250.0 | $ 75.6
Number of real estate properties of acquired entity which were leased by subsidiaries of our entity |  | 18
Value of debt assumed | $ 12.3 | $ 40.5

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- Definition Represents the number of real estate properties of the acquired entity, which were leased by subsidiaries of the reporting entity. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of acquisition cost of a business combination allocated to other current and noncurrent liabilities of the acquired entity. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration