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Employee Benefits - Defined Contribution Plan Information (Details) | 12 Months Ended
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Dec. 31, 2018
Defined Contribution Plans |
Eligibility period of service | 3 months
Vesting percentage per year | 25.00%

X
- Definition Represents the period of service required for employees to be eligible for participation in the defined contribution plan. + References No definition available. + Details
Name: | rs_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix: | rs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage at which the entity's contribution under defined contribution plan vests. + References No definition available. + Details
Name: | rs_DefinedContributionPlanVestingPercentage
Namespace Prefix: | rs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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