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Organization and Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
segment
Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]    
Number of reportable segments 2us-gaap_NumberOfReportableSegments  
Interest Revenue [Member]    
Condensed Financial Statements, Captions [Line Items]    
Reclassified amount   $ 11.0us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_IncomeStatementLocationAxis
= pjc_InvestmentBankingandInstitutionalBrokerageRevenueMember
Interest Expense [Member]    
Condensed Financial Statements, Captions [Line Items]    
Reclassified amount   $ 10.2us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember