v3.26.3
Financial Instruments and Other Inventory Positions - Unrealized Gains/(Losses) on Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss)        
Unrealized gains/(losses) on derivative instruments $ 12,106 $ (4,335) $ 15,648 $ (4,111)
Interest rate derivate contract | Income Statement Location [Axis]: us-gaap:InvestmentBankingRevenue        
Derivative Instruments, Gain (Loss)        
Unrealized gains/(losses) on derivative instruments (130) (30) (234) (55)
Interest rate derivate contract | Income Statement Location [Axis]: pipr:InstitutionalBrokerageRevenue        
Derivative Instruments, Gain (Loss)        
Unrealized gains/(losses) on derivative instruments $ 12,236 $ (4,305) $ 15,882 $ (4,056)