v3.26.3
Compensation and Benefits - Change in Value of Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Variable Interest Entity, Primary Beneficiary        
Schedule of Investments [Line Items]        
Net investment gain (loss) of nonconsolidated investment products $ 359 $ 8,738 $ 10,560 $ 38,506
Long-Term Cash Awards | Location, Statement of Income, Balance [Axis]: us-gaap:GainLossOnInvestments        
Schedule of Investments [Line Items]        
Net investment gain (loss) of nonconsolidated investment products (3,868) 9,407 17,759 27,403
Long-Term Cash Awards | Location, Statement of Income, Balance [Axis]: us-gaap:GainLossOnInvestments | Variable Interest Entity, Primary Beneficiary        
Schedule of Investments [Line Items]        
Net investment gain (loss) of nonconsolidated investment products (381) 645 1,967 3,625
Long-Term Cash Awards | Location, Statement of Income, Balance [Axis]: us-gaap:LaborAndRelatedExpense        
Schedule of Investments [Line Items]        
Compensation and benefits $ 1,098 $ 7,277 $ 17,877 $ 19,714