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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Advertising Costs $ 42,335,000us-gaap_AdvertisingExpense $ 38,845,000us-gaap_AdvertisingExpense $ 42,256,000us-gaap_AdvertisingExpense
Valuation allowance 29,561,000us-gaap_DeferredTaxAssetsValuationAllowance 37,044,000us-gaap_DeferredTaxAssetsValuationAllowance  
Provision for workers' compensation claims threshold 500,000rhi_ProvisionForWorkersCompensationClaims    
Internal-use software development costs $ 24,367,000us-gaap_PaymentsToDevelopSoftware $ 13,027,000us-gaap_PaymentsToDevelopSoftware $ 19,083,000us-gaap_PaymentsToDevelopSoftware
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Amortized life assigned to identifiable intangible assets (in years) 2 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Amortized life assigned to identifiable intangible assets (in years) 5 years    
Computer Hardware | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Computer Hardware | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Computer Software | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Computer Software | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Furniture and Fixtures      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Leasehold Improvements | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Property, Plant and Equipment, Useful Life 5 years