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Stockholders' Equity Number and Cost of Employee Stock Plan Repurchases (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |
Employee stock plan repurchased (in shares) | 462 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares | 1,157 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares | 1,661 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares
Employee stock plan repurchased | $ 22,386 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue | $ 44,169 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue | $ 50,045 rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue

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- 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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- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration