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Condensed Consolidating Financial Statements - (Detail) - Senior Unsecured Notes - USD ($) $ in Billions	1 Months Ended
	Apr. 30, 2013	Nov. 30, 2006
Condensed Consolidating Balance Sheet
Proceeds from Issuance of Debt	$ 1.1	$ 1.1
Majority Interest Ownership Percentage by Parent	100.00%	100.00%

X

- Definition

Represents the parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	rs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: