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Segment Information - Summary of sales by product and service (Details) | 12 Months Ended
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Dec. 31, 2021 segment item | Dec. 31, 2020 segment item | Dec. 31, 2019 item segment
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) | 58.00% | 51.00% | 52.00%
Aluminum |  |  |
Segment Information |  |  |
Sales (as a percent) | 14.00% | 19.00% | 19.00%
Stainless steel |  |  |
Segment Information |  |  |
Sales (as a percent) | 16.00% | 16.00% | 14.00%
Alloy steel |  |  |
Segment Information |  |  |
Sales (as a percent) | 4.00% | 5.00% | 6.00%
Other. |  |  |
Segment Information |  |  |
Sales (as a percent) | 5.00% | 5.00% | 5.00%
Toll processing |  |  |
Segment Information |  |  |
Sales (as a percent) | 3.00% | 4.00% | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=rs_CarbonSteelMember
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_StainlessSteelMember
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_OtherProductsOrServicesMember
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: |