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Employee Compensation and Benefits - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 09, 2023
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Compensation Items [Line Items]          
Partnership interest-based compensation   $ 12,225,000 $ 30,002,000    
Interest-based compensation, award modifications   5,400,000 18,500,000    
Unvested stated target payments   14,600,000 0    
Interest-based compensation expense, profit interest   2,900,000 2,400,000    
Holding Awards          
Compensation Items [Line Items]          
Partnership interest-based compensation   0 3,600,000    
Aggregate grant date fair value $ 155,500,000        
Target amount reserved       $ 80,000,000  
Estimated holding period (in years) 10 years        
Pre-tax cost of equity percentage 15.40%        
Discount rate (as percent) 13.00%        
Volatility rate (as percent) 35.00%        
Discount rate for lack of marketability (as percent) 40.00%        
Holdings, Holdings II and Management LLC          
Compensation Items [Line Items]          
Partnership interest-based compensation   12,200,000 30,000,000.0    
GCMH Equityholders Awards          
Compensation Items [Line Items]          
Partnership interest-based compensation   3,900,000 $ 5,500,000    
Equityholders awards, aggregate grant fair value (in shares)         7,169,415
Aggregate grant date fair value         $ 53,400,000
Equityholders awards, grant fair value (in dollars per share)         $ 7.45
Nonvested award, cost not yet recognized, amount   $ 1,800,000      
Nonvested award, cost not yet recognized, period for recognition (in years)   1 month 6 days