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Summary of Significant Accounting Policies and Basis of Presentation - Fair Value of Financial Instruments (Details) (Business acquisition obligations [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Business acquisition obligations [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial and nonfinancial liabilities, fair value $ 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= prgx_BusinessAcquisitionObligationsMember		 $ 3.2us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= prgx_BusinessAcquisitionObligationsMember