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Contingencies, Commitments, and Guarantees - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Litigation Related Reserve Activity, Net $ 0.8pjc_LitigationRelatedReserveActivityNet $ (4.1)pjc_LitigationRelatedReserveActivityNet $ 0.9pjc_LitigationRelatedReserveActivityNet
Remaining Capital Commitments To Investment Vehicles $ 37.3pjc_RemainingCapitalCommitmentsToInvestmentVehicles