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Investments Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2015
vote
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Number of votes 1praa_NumberOfVotes  
Cost-method investment, ownership percentage 3.00%praa_CostmethodInvestmentOwnershipPercentage  
Series B Certificates    
Schedule of Equity Method Investments [Line Items]    
Investment in securitized assets, certificates, ownership percentage   100.00%praa_InvestmentInSecuritizedAssetsCertificatesOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= praa_SeriesBCertificatesMember
Series C Certificates    
Schedule of Equity Method Investments [Line Items]    
Investment in securitized assets, certificates, ownership percentage   20.00%praa_InvestmentInSecuritizedAssetsCertificatesOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= praa_SeriesCCertificatesMember
Held-to-maturity Securities [Member] | Other Revenue [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment Income, Net 1.2us-gaap_InvestmentIncomeNet
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_IncomeStatementLocationAxis
= praa_OtherRevenueMember