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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitment And Contingencies [Line Items] |  |  |
Rental expense | $ 96.8 | $ 100.6 | $ 103.6
Future purchase commitments | $ 44 |  |
Purchase commitment period | 3 years |  |

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- Details
Name: | rhi_CommitmentAndContingenciesLineItems
Namespace Prefix: | rhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long Term Purchase Commitment, Period + References No definition available. + Details
Name: | rhi_LongTermPurchaseCommitmentPeriod
Namespace Prefix: | rhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration