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Stock Plans Activity Under All Stock Plans and Weighted Average Exercise Prices (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares/Units, Outstanding Beginning Balance | 632 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 2,091 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 4,450 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Shares/Units, Granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Number of Shares/Units, Exercised | (528)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (1,397)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (2,260)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Number of Shares/Units, Restrictions lapsed | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod
Number of Shares/Units, Forfeited | (27)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (62)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (99)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Number of Shares/Units, Outstanding, Ending Balance | 77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 632 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 2,091 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted Average Exercise Price Per Share, Outstanding Beginning Balance | $ 27.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 24.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 21.85 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Granted | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Exercised | $ 27.12 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 23.82 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 19.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Restrictions lapsed | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice | $ 0 rhi_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Forfeited | $ 27.83 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 20.48 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 24.74 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Outstanding Ending Balance | $ 29.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 27.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 24.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Restricted stock and stock units | Without Market Conditions |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares/Units, Outstanding Beginning Balance | 1,317 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 1,737 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 2,392 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Number of Shares/Units, Granted | 585 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 688 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 937 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Number of Shares/Units, Exercised | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Number of Shares/Units, Restrictions lapsed | (712)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | (1,087)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | (1,550)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Number of Shares/Units, Forfeited | (25)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | (21)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | (42)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Number of Shares/Units, Outstanding, Ending Balance | 1,165 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 1,317 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | 1,737 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance | $ 31.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 28.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 24.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Granted | $ 41.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 35.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 27.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Exercised | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Restrictions lapsed | $ 31.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 28.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 22.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Forfeited | $ 32.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 31.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 24.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Outstanding Ending Balance | $ 36.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 31.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember | $ 28.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_NotSubjectToMarketConditionsMember
Restricted stock and stock units | With Market Conditions |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares/Units, Outstanding Beginning Balance | 899 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 758 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 523 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Number of Shares/Units, Granted | 335 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 517 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Number of Shares/Units, Exercised | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Number of Shares/Units, Restrictions lapsed | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | (259)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | (240)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Number of Shares/Units, Forfeited | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | (42)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Number of Shares/Units, Outstanding, Ending Balance | 1,234 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 899 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | 758 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance | $ 36.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 30.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 33.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Granted | $ 50.09 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 42.04 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 29.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Exercised | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 0 rhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Restrictions lapsed | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 29.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 33.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Forfeited | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 33.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember
Weighted Average Grant Date Fair Value, Outstanding Ending Balance | $ 40.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 36.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember | $ 30.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember / us-gaap_VestingAxis = rhi_SubjectToMarketConditionsMember

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Exercises In Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Exercisable Number + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Grant In Period Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Vested In Period Weighted Average Exercise Price + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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