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Employee Deferred Compensation Plan Obligations - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Deferred Compensation Plans [Abstract] |  |
Employee deferred compensation trust assets | $ 462,260 | $ 406,634
Employee deferred compensation plan obligations | $ 492,147 | $ 435,121

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- Definition Deferred Compensation Plan Assets, Current + References No definition available. + Details
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Balance Type: | debit
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- Definition Deferred Compensation Plans + References No definition available. + Details
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Namespace Prefix: | rhi_
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + Details
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