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Number and Cost of Employee Stock Plan Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Uncategorized [Abstract] |  |  |
Employee stock plan repurchased (in shares) | 1,157 | 1,661 | 1,020
Employee stock plan repurchased | $ 44,169 | $ 50,045 | $ 29,017

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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
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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
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Namespace Prefix: | rhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration