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Fair Value - Narrative (Details)
 1 Months Ended 3 Months Ended
Jul. 31, 2020
security
$ / shares
shares
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Securities sold short—consolidated funds   $ 45,628,000 $ 40,928,000    
Derivative assets   0 11,793,000    
Warrants issued to Wafra (Note 10)   22,200,000 17,700,000    
Decrease in fair value of warrants   $ 4,500,000      
Discount rate   4.90%      
InfraBridge          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration payable—Wafra (Note 10)   $ 10,938,000 0    
Common Stock Warrants | Class A Common Stock          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Number of warrants issued | security 5        
Number of shares called by each warrant (in shares) | shares 1,338,000        
Common Stock Warrants | Class A Common Stock | Minimum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Strike price (in dollars per share) | $ / shares $ 9.72        
Common Stock Warrants | Class A Common Stock | Maximum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Strike price (in dollars per share) | $ / shares $ 24.00        
Foreign exchange contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notional amount     $ 321,100,000    
Measurement Input, Price Volatility          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Warrants and rights outstanding, measurement input   0.444 0.408    
Measurement Input, Risk Free Interest Rate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Warrants and rights outstanding, measurement input   0.0378 0.0416    
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Outstanding balance   $ 168,800,000 $ 167,800,000    
Level 1 | Equity Securities | Long          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Marketable securities   166,000,000 155,900,000    
Level 1 | Equity Securities | Short          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Marketable securities   45,600,000 $ 40,900,000    
Level 3 | Discount rate | Minimum | Loans Receivable          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Measurement input     0.100    
Level 3 | Discount rate | Maximum | Loans Receivable          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Measurement input     0.105    
Level 3 | Equity Investment of Consolidated Fund | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Investment   62,508,000 $ 46,770,000 $ 0 $ 0
Level 3 | Loans Receivable | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Investment   6,804,000 $ 137,945,000 $ 327,955,000 $ 82,930,000
Fair Value Measured at Net Asset Value Per Share | Recurring | Retail Companies, Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Alternative Investment   $ 34,500,000