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Commitments and Contingencies - Legal Matters (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($) item
Commitments and Contingencies. |
Number of former employees who allege the Company engaged in anticompetitive activities | item | 2
Amount paid for settlement of claims | $ | $ 23.0

X
- Definition Represents the number of former employees engaged in anticompetitive activities. + References No definition available. + Details
Name: | rs_NumberOfFormerEmployees
Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration