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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accounting Policies [Abstract] |  |  |  |
Dividend income | $ (2,232) | $ (2,315) | $ (3,795) | $ (2,610)
Realized and unrealized (gains) losses | (26,115) | 67,937 | (51,843) | 98,233
(Income) loss from investments held in employee deferred compensation trusts | $ (28,347) | $ 65,622 | $ (55,638) | $ 95,623

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

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

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