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Property and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Computer hardware $ 159,309rhi_ComputerHardwareGross $ 148,541rhi_ComputerHardwareGross  
Computer software 312,968us-gaap_CapitalizedComputerSoftwareGross 288,532us-gaap_CapitalizedComputerSoftwareGross  
Furniture and equipment 105,262us-gaap_FurnitureAndFixturesGross 111,426us-gaap_FurnitureAndFixturesGross  
Leasehold improvements 113,782us-gaap_LeaseholdImprovementsGross 118,868us-gaap_LeaseholdImprovementsGross  
Other 9,045us-gaap_PropertyPlantAndEquipmentOther 11,488us-gaap_PropertyPlantAndEquipmentOther  
Property and equipment, cost 700,366us-gaap_PropertyPlantAndEquipmentGross 678,855us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (578,612)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (566,211)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property and equipment, net $ 121,754us-gaap_PropertyPlantAndEquipmentNet $ 112,644us-gaap_PropertyPlantAndEquipmentNet $ 107,680us-gaap_PropertyPlantAndEquipmentNet