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Business Acquisitions and Divestitures (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair values of net assets acquired:        
Goodwill $ 13,036us-gaap_Goodwill $ 13,686us-gaap_Goodwill $ 13,669us-gaap_Goodwill  
Associate Migrations [Member]        
Fair values of net assets acquired:        
Equipment     10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= prgx_AssociateMigrationsMember
 
Intangible assets, primarily non-compete agreements     171us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= prgx_AssociateMigrationsMember
 
Working capital, including work in progress     666prgx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedWorkInProgress
/ us-gaap_BusinessAcquisitionAxis
= prgx_AssociateMigrationsMember
 
Goodwill     695us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= prgx_AssociateMigrationsMember
 
Fair value of net assets acquired     1,542us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= prgx_AssociateMigrationsMember
 
Business Strategy, Inc. [Member]        
Fair values of net assets acquired:        
Equipment       70us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member
Intangible assets, primarily non-compete agreements       4,041us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member
Working capital, including work in progress       1,967prgx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedWorkInProgress
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member
Deferred tax liabilities       (1,736)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member
Goodwill       7,577us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member
Fair value of net assets acquired       $ 11,919us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= prgx_BusinessStrategyInc.Member