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Investments - Summary of Investments (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
investment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Investments      
Cost method investment ownership percentage 10.00%    
Number of equity method investments | investment 10    
Fair Value, Investments, Privately Held Entities that Calculate NAV, Unfunded Commitments $ 377,200    
Limited partnership maximum expiration terms 12 years    
Weighted-average remaining liquidation term (in years) 5 years 3 months 18 days    
Limited partnership liquidation, expected initial term (in years) 10 years    
Equity Securities, FV-NI, Realized Gain $ 28,800    
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount (14,700)    
Equity in earnings of unconsolidated real estate joint ventures 155 $ 194  
Summary of Investment [Abstract]      
Investment at fair value, cost 1,175,505   $ 1,177,072
Cumulative unrealized gains on investments 320,434   320,445
Cumulative unrealized losses on investments (100,193)   (123,497)
Investments accounted for under the equity method 115,842   75,498
Total investments held at adjusted carrying value or fair value 1,511,588   1,449,518
Investment Income, Net [Abstract]      
Realized gains 14,126 20,744  
Unrealized gains (losses) 29,158 (65,855)  
Investment income (loss) 43,284 (45,111)  
Equity Method Investments      
Schedule of Investments      
Equity in earnings of unconsolidated real estate joint ventures 5,000    
Investments in publicly traded companies      
Summary of Investment [Abstract]      
Investment at fair value, cost 187,775   203,467
Cumulative unrealized gains on investments 57,761   50,377
Cumulative unrealized losses on investments (71,015)   (94,278)
Investments at fair value, book value $ 174,521   159,566
Investments in privately held entities that report NAV      
Schedule of Investments      
Weighted-average remaining liquidation term (in years) 8 years 3 months 18 days    
Summary of Investment [Abstract]      
Investment at fair value, cost $ 511,039   507,059
Cumulative unrealized gains on investments 189,044   192,468
Cumulative unrealized losses on investments (27,954)   (27,995)
Investments at fair value, book value 672,129   671,532
Investments in privately held entities that do not report NAV | Entities with observable price change      
Schedule of Investments      
Investment in privately held entities that do not report NAV, cumulative price adjustments (64,600)    
Investments in privately held entities that do not report NAV, cumulative upward price adjustment 73,600    
Investments in privately held entities that do not report NAV, cumulative downward price adjustment (1,200)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (137,000)    
Annual adjustments recognized on investments in privately held entities that do not report NAV 10,500 (510)  
Investments in privately held entities that do not report NAV, annual upward price adjustment 8,600 1,800  
Investments in privately held entities that do not report NAV, annual downward price adjustment 19,100 2,300  
Summary of Investment [Abstract]      
Investment at fair value, cost 94,283   97,892
Cumulative unrealized gains on investments 73,629   77,600
Cumulative unrealized losses on investments (1,224)   (1,224)
Investments in privately held entities that do not report fair value, book value 166,688   174,268
Investments in privately held entities that do not report NAV | Entities without observable price changes      
Summary of Investment [Abstract]      
Investment at fair value, cost 382,408   368,654
Cumulative unrealized gains on investments 0   0
Cumulative unrealized losses on investments 0   0
Investments in privately held entities that do not report fair value, book value 382,408   $ 368,654
Total investments held      
Investment Income, Net [Abstract]      
Unrealized gains (losses) $ 47,800 $ (38,300)