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Stock Plans Information of Option Outstanding and Exercisable (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding and Exercisable, Number 77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 632us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,091us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 4,450us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Outstanding and Exercisable, Weighted-Average Remaining Contractual Life 7 months 2 days      
Options Outstanding and Exercisable, Weighted-Average Exercise Price $ 29.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 27.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 24.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 21.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Outstanding and Exercisable, Aggregate Intrinsic Value $ 2,253us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
$25.34 to $25.34        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower $ 25.34us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeOneMember		      
Range of Exercise Prices, Upper $ 25.34us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeOneMember		      
Options Outstanding and Exercisable, Number 30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeOneMember		      
Options Outstanding and Exercisable, Weighted-Average Remaining Contractual Life 4 months 2 days      
Options Outstanding and Exercisable, Weighted-Average Exercise Price $ 25.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeOneMember		      
Options Outstanding and Exercisable, Aggregate Intrinsic Value 991us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeOneMember		      
$30.34 to $30.34        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower $ 30.34us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeTwoMember		      
Range of Exercise Prices, Upper $ 30.34us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeTwoMember		      
Options Outstanding and Exercisable, Number 21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeTwoMember		      
Options Outstanding and Exercisable, Weighted-Average Remaining Contractual Life 29 days      
Options Outstanding and Exercisable, Weighted-Average Exercise Price $ 30.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeTwoMember		      
Options Outstanding and Exercisable, Aggregate Intrinsic Value 601us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeTwoMember		      
$32.36 to $32.36        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower $ 32.36us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeThreeMember		      
Range of Exercise Prices, Upper $ 32.36us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeThreeMember		      
Options Outstanding and Exercisable, Number 18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeThreeMember		      
Options Outstanding and Exercisable, Weighted-Average Remaining Contractual Life 1 year 6 months 29 days      
Options Outstanding and Exercisable, Weighted-Average Exercise Price $ 32.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeThreeMember		      
Options Outstanding and Exercisable, Aggregate Intrinsic Value 477us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeThreeMember		      
$33.89 to $33.89        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower $ 33.89us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeFourMember		      
Range of Exercise Prices, Upper $ 33.89us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeFourMember		      
Options Outstanding and Exercisable, Number 8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeFourMember		      
Options Outstanding and Exercisable, Weighted-Average Remaining Contractual Life 6 months 29 days      
Options Outstanding and Exercisable, Weighted-Average Exercise Price $ 33.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeFourMember		      
Options Outstanding and Exercisable, Aggregate Intrinsic Value $ 184us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rhi_RangeFourMember