XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.23.1

Summary of Significant Accounting Policies - Schedule of Company's (Income) Loss from Investments Held in Employee Deferred Compensation Trusts (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Accounting Policies [Abstract] |  |
Dividend income | $ (1,563) | $ (295)
Realized and unrealized (gains) losses | (25,728) | 30,296
(Income) loss from investments held in employee deferred compensation trusts | $ (27,291) | $ 30,001

X
- Definition Deferred Compensation Plan, Dividend Income + References No definition available. + Details
Name: | rhi_DeferredCompensationPlanDividendIncome
Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred Compensation Plan, Investment Income + References No definition available. + Details
Name: | rhi_DeferredCompensationPlanInvestmentIncome
Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred Compensation Plan, Realized and Unrealized Gain (Loss) + References No definition available. + Details
Name: | rhi_DeferredCompensationPlanRealizedAndUnrealizedGainLoss
Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration