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Employee Benefits - Defined Contribution Plan Information (Details)	12 Months Ended
	Dec. 31, 2021
Defined Contribution Plans
Vesting percentage per year	25.00%

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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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