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Investments - Summary of Investments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
investment
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
investment
Jun. 30, 2023
USD ($)
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 $ 402,000   $ 402,000    
Limited partnership maximum expiration terms     12 years    
Weighted-average remaining liquidation term (in years)     5 years 4 months 24 days    
Limited partnership liquidation, expected initial term (in years)     10 years    
Equity Securities, FV-NI, Realized Gain 33,400   $ 62,200    
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount (12,800)   (27,500)    
Equity in earnings of unconsolidated real estate joint ventures 130 $ 181 285 $ 375  
Summary of Investment [Abstract]          
Investment at fair value, cost 1,195,289   1,195,289   $ 1,177,072
Cumulative unrealized gains on investments 284,220   284,220   320,445
Cumulative unrealized losses on investments (124,443)   (124,443)   (123,497)
Investments accounted for under the equity method 139,282   139,282   75,498
Total investments held at adjusted carrying value or fair value 1,494,348   1,494,348   1,449,518
Investment Income, Net [Abstract]          
Realized gains (losses) 20,578 (371) 34,704 20,373  
Unrealized losses (64,238) (77,897) (35,080) (143,752)  
Investment loss (43,660) $ (78,268) (376) (123,379)  
Equity Method Investments          
Schedule of Investments          
Equity in earnings of unconsolidated real estate joint ventures     (700)    
Investments in publicly traded companies          
Summary of Investment [Abstract]          
Investment at fair value, cost 201,321   201,321   203,467
Cumulative unrealized gains on investments 42,052   42,052   50,377
Cumulative unrealized losses on investments (90,182)   (90,182)   (94,278)
Investments at fair value, book value 153,191   $ 153,191   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 510,335   $ 510,335   507,059
Cumulative unrealized gains on investments 162,559   162,559   192,468
Cumulative unrealized losses on investments (33,254)   (33,254)   (27,995)
Investments at fair value, book value 639,640   639,640   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 (59,600)   (59,600)    
Investments in privately held entities that do not report NAV, cumulative upward price adjustment 79,600   79,600    
Investments in privately held entities that do not report NAV, cumulative downward price adjustment (1,000)   (1,000)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (138,200)   (138,200)    
Equity Securities without Readily Determinable Fair Value, Net Upward (Downward) Price Adjustment, Annual Amount     (13,700) (23,300)  
Investments in privately held entities that do not report NAV, annual upward price adjustment     15,700 3,800  
Investments in privately held entities that do not report NAV, annual downward price adjustment     29,400 27,100  
Summary of Investment [Abstract]          
Investment at fair value, cost 94,509   94,509   97,892
Cumulative unrealized gains on investments 79,609   79,609   77,600
Cumulative unrealized losses on investments (1,007)   (1,007)   (1,224)
Investments in privately held entities that do not report fair value, book value 173,111   173,111   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 389,124   389,124   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 $ 389,124   389,124   $ 368,654
Total investments held          
Investment Income, Net [Abstract]          
Unrealized losses     $ (1,800) $ (47,600)