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Segment Information - Summary of sales by product and service (Details) | 12 Months Ended
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Dec. 31, 2023 segment item | Dec. 31, 2022 segment item | Dec. 31, 2021 segment item
Segment Information |  |  |
Number of reportable segments | item | 1 | 1 | 1
Number of operating segments | segment | 1 | 1 | 1
Sales (as a percent) | 100.00% | 100.00% | 100.00%
Carbon steel |  |  |
Segment Information |  |  |
Sales (as a percent) | 53.00% | 54.00% | 58.00%
Stainless steel |  |  |
Segment Information |  |  |
Sales (as a percent) | 15.00% | 17.00% | 16.00%
Aluminum |  |  |
Segment Information |  |  |
Sales (as a percent) | 16.00% | 15.00% | 14.00%
Alloy |  |  |
Segment Information |  |  |
Sales (as a percent) | 5.00% | 4.00% | 4.00%
Toll processing and logistics |  |  |
Segment Information |  |  |
Sales (as a percent) | 4.00% | 3.00% | 3.00%
Copper and brass |  |  |
Segment Information |  |  |
Sales (as a percent) | 2.00% | 2.00% | 1.00%
Other and eliminations |  |  |
Segment Information |  |  |
Sales (as a percent) | 5.00% | 5.00% | 4.00%

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- Definition Represents the percentage of revenue from sale of goods and services. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_StainlessSteelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_AluminumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_AlloySteelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_TollProcessingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_CopperAndBrassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=rs_OtherProductsOrServicesMember
Namespace Prefix: |
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Balance Type: |
Period Type: |