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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 | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounting Policies [Abstract] |  |  |  |
Dividend income | $ (2,361) | $ (966) | $ (6,156) | $ (3,576)
Realized and unrealized (gains) losses | 16,636 | 16,301 | (35,207) | 114,534
(Income) loss from investments held in employee deferred compensation trusts | $ 14,275 | $ 15,335 | $ (41,363) | $ 110,958

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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
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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
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