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Subsequent Event (Details) - Subsequent event - TSI $ in Millions | Jan. 01, 2016 USD ($) item
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Subsequent Event |
Number of locations the entity operates | item | 7
Net Sales from prior period | $ | $ 200.0

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- Definition Represents sales of an acquired entity from the prior reporting period. + References No definition available. + Details
Name: | rs_NetSalesFromPriorReportingPeriod
Namespace Prefix: | rs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of locations the entity operates. + References No definition available. + Details
Name: | rs_NumberOfLocationEntityOperates
Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=rs_TubularSteelInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |