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Stockholders' Equity Number of Cost of Common Stock Shares Repurchased (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] |  |  |
Common stock repurchased (in shares) | 3,336 rhi_CommonStockRepurchasedShares | 3,305 rhi_CommonStockRepurchasedShares | 4,689 rhi_CommonStockRepurchasedShares
Common stock repurchased | $ 161,587 rhi_CommonStockRepurchasedValue | $ 117,864 rhi_CommonStockRepurchasedValue | $ 132,691 rhi_CommonStockRepurchasedValue

X
- Definition Number of shares repurchased during the period that are held in treasury and are presented as if constructively retired. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
Name: | rhi_CommonStockRepurchasedShares
Namespace Prefix: | rhi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the value of stock that has been repurchased during the period that is held in treasury and is presented as if constructively retired. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
Name: | rhi_CommonStockRepurchasedValue
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