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Investments - Summary of Investments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Investments          
Cost method investment ownership percentage 10.00%   10.00%    
Number of equity method investments | investment 10   10    
Fair Value, Investments, Privately Held Entities that Calculate NAV, Unfunded Commitments $ 379,900   $ 379,900    
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 23,000   $ 85,200    
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount (10,300)   (37,800)    
Equity in earnings of unconsolidated real estate joint ventures 139 $ 242 424 $ 617  
Summary of Investment [Abstract]          
Investment at fair value, cost 1,215,370   1,215,370   $ 1,177,072
Cumulative unrealized gains on investments 284,403   284,403   320,445
Cumulative unrealized losses on investments (118,154)   (118,154)   (123,497)
Investments accounted for under the equity method 137,708   137,708   75,498
Total investments held at adjusted carrying value or fair value 1,519,327   1,519,327   1,449,518
Investment Income, Net [Abstract]          
Realized gains (losses) 12,632 (3,470) 47,336 16,903  
Unrealized gains (losses) 2,610 (77,202) (32,470) (220,954)  
Investment income (loss) 15,242 $ (80,672) 14,866 (204,051)  
Equity Method Investments          
Schedule of Investments          
Equity in earnings of unconsolidated real estate joint ventures     (5,400)    
Investments in publicly traded companies          
Summary of Investment [Abstract]          
Investment at fair value, cost 187,085   187,085   203,467
Cumulative unrealized gains on investments 50,933   50,933   50,377
Cumulative unrealized losses on investments (85,592)   (85,592)   (94,278)
Investments at fair value, book value 152,426   $ 152,426   159,566
Investments in privately held entities that report NAV          
Schedule of Investments          
Weighted-average remaining liquidation term (in years)     8 years 1 month 6 days    
Summary of Investment [Abstract]          
Investment at fair value, cost 527,042   $ 527,042   507,059
Cumulative unrealized gains on investments 160,608   160,608   192,468
Cumulative unrealized losses on investments (31,225)   (31,225)   (27,995)
Investments at fair value, book value 656,425   656,425   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 (73,400)   (73,400)    
Investments in privately held entities that do not report NAV, cumulative upward price adjustment 72,900   72,900    
Investments in privately held entities that do not report NAV, cumulative downward price adjustment (1,300)   (1,300)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (144,900)   (144,900)    
Equity Securities without Readily Determinable Fair Value, Net Upward (Downward) Price Adjustment, Annual Amount     (27,300) (57,700)  
Investments in privately held entities that do not report NAV, annual upward price adjustment     17,600 16,500  
Investments in privately held entities that do not report NAV, annual downward price adjustment     44,900 74,200  
Summary of Investment [Abstract]          
Investment at fair value, cost 93,982   93,982   97,892
Cumulative unrealized gains on investments 72,862   72,862   77,600
Cumulative unrealized losses on investments (1,337)   (1,337)   (1,224)
Investments in privately held entities that do not report fair value, book value 165,507   165,507   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 407,261   407,261   368,654
Cumulative unrealized gains on investments 0   0   0
Cumulative unrealized losses on investments 0   0   0
Investments in privately held entities that do not report fair value, book value $ 407,261   407,261   $ 368,654
Total investments held          
Investment Income, Net [Abstract]          
Unrealized gains (losses)     $ 15,700 $ (97,800)