XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Summary of Significant Accounting Policies - Composition of Underlying Assets Comprising Company's Deferred Compensation Plans Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Employee deferred compensation trust assets | $ 494,991 | $ 406,634
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 | 494,991 | 406,634
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 | 66,700 | 69,681
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 | 66,700 | 69,681
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 | 30,750 | 27,282
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 | 30,750 | 27,282
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 | 303,277 | 234,667
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 | 303,277 | 234,667
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 | 94,264 | 75,004
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 | 94,264 | 75,004
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: |