XML 50 R40.htm IDEA: XBRL DOCUMENT
v3.23.3

Summary of Significant Accounting Policies - Schedule of Composition of Underlying Assets Comprising Company's Deferred Compensation Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | $ 523,843 | $ 432,734
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 523,843 | 432,734
Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Money market funds |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 122,080 | 77,730
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 122,080 | 77,730
Money market funds | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Money market funds | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - bond |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 31,945 | 31,096
Mutual funds - bond | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 31,945 | 31,096
Mutual funds - bond | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - bond | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - stock |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 285,164 | 245,908
Mutual funds - stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 285,164 | 245,908
Mutual funds - stock | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - stock | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - blend |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 84,654 | 78,000
Mutual funds - blend | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 84,654 | 78,000
Mutual funds - blend | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | 0 | 0
Mutual funds - blend | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | $ 0 | $ 0

X
- Definition Deferred Compensation Plan Assets, Current + References No definition available. + Details
Name: | rhi_DeferredCompensationPlanAssetsCurrent
Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rhi_MutualFundBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rhi_MutualFundStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rhi_MutualFundBlendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |