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Stockholders' Equity - Number and Cost of Employee Stock Plan Repurchases (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Repurchases related to employee stock plans (in shares) | 366 | 352 | 235
Repurchases related to employee stock plans | $ 17,399 | $ 22,491 | $ 13,674

X
- Definition Shares repurchased in connection with employee stock plans, whereby Company shares were tendered by employees for the payment of applicable withholding taxes and/or exercise price. + References No definition available. + Details
Name: | rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares
Namespace Prefix: | rhi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Value of shares repurchased in connection with employee stock plans, whereby Company shares were tendered by employees for the payment of applicable withholding taxes and/or exercise price. + References No definition available. + Details
Name: | rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue
Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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