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Employee Deferred Compensation Plan Obligations - Compensation Expense Related to Qualified and Nonqualified Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Deferred Compensation Plans [Abstract] |  |
Contribution expense | $ 9,554 | $ 8,485
Increase (decrease) in employee deferred compensation expense related to changes in the fair value of trust assets | 11,988 | (40,376)
Total compensation expense related to qualified defined contribution plans and nonqualified plans | $ 21,542 | $ (31,891)

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- Definition Deferred Compensation Plans + References No definition available. + Details
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Namespace Prefix: | rhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan, (Income) Expense + References No definition available. + Details
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Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration