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Employee Benefits (Details)	12 Months Ended
	Dec. 31, 2013
Defined Contribution Plans
Eligibility period of service	3 months
Vesting percentage per year	25.00%
Period after which vesting of the Company's contribution commences	1 year

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 period after which vesting of the company's contribution commences.

+ References

No definition available.

+ Details

Name:	rs_DefinedContributionPlanThresholdPeriodForVesting
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

- Details

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