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Investments - Summary of Investments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
investment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]      
Cost method investment ownership percentage 10.00%    
Number Of Equity Method Investments | investment 11    
Investments accounted for under the equity method $ 186,228 $ 75,498  
Fair Value, Investments, Privately Held Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 372,900    
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 $ 117,200    
Investments in privately held entities that do not report NAV, impairment loss (58,100)    
Unrealized losses (112,246) (201,475) $ (412,193)
Investment loss (53,122) (195,397) (331,758)
Equity in earnings of unconsolidated real estate joint ventures 7,059 980 645
Summary of Investment [Abstract]      
Investment at fair value, cost 1,207,146 1,177,072  
Cumulative unrealized gains on investments 228,100 320,445  
Cumulative unrealized losses on investments (144,489) (123,497)  
Total investments held at adjusted carrying value or fair value 1,476,985 1,449,518  
Equity Method Investments      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated real estate joint ventures (2,600)    
Investments in publicly traded companies      
Summary of Investment [Abstract]      
Investment at fair value, book value $ 105,667 159,566  
Investments in privately held entities that report NAV      
Schedule of Investments [Line Items]      
Weighted-average remaining liquidation term (in years) 8 years 2 months 12 days    
Summary of Investment [Abstract]      
Investment at fair value, book value $ 609,866 671,532  
Investments in privately held entities that do not report NAV | Entities with observable price change      
Schedule of Investments [Line Items]      
Equity Securities without Readily Determinable Fair Value, Net Upward (Downward) Price Adjustment, Annual Amount     (18,300)
Investments in privately held entities that do not report NAV, annual upward price adjustment     26,300
Investments in privately held entities that do not report NAV, annual downward price adjustment     (44,600)
Summary of Investment [Abstract]      
Cumulative unrealized gains on investments 77,761    
Investment in privately held entities that do not report fair value, book value 174,737 174,268  
Investments in privately held entities that do not report NAV | Entities without observable price changes      
Summary of Investment [Abstract]      
Investment in privately held entities that do not report fair value, book value 400,487 368,654  
Total investments held      
Schedule of Investments [Line Items]      
Unrealized losses (32,700) (58,800) $ (276,500)
Investments in privately held entities that do not report NAV | Entities with observable price change      
Schedule of Investments [Line Items]      
Investment in privately held entities that do not report NAV, cumulative price adjustment (90,400)    
Investment in privately held entities that do not report NAV, upward price adjustment 77,800    
Investment in privately held entities that do not report NAV, downward price adjustment (3,000)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (165,200)    
Equity Securities without Readily Determinable Fair Value, Net Upward (Downward) Price Adjustment, Annual Amount (37,700) (77,700)  
Investments in privately held entities that do not report NAV, annual upward price adjustment 22,800 16,800  
Investments in privately held entities that do not report NAV, annual downward price adjustment (60,500) (94,600)  
Summary of Investment [Abstract]      
Investment at fair value, cost 99,932 97,892  
Cumulative unrealized gains on investments   77,600  
Cumulative unrealized losses on investments (2,956) (1,224)  
Investments in privately held entities that do not report NAV | Entities without observable price changes      
Summary of Investment [Abstract]      
Investment at fair value, cost 400,487 368,654  
Cumulative unrealized gains on investments 0 0  
Cumulative unrealized losses on investments 0 0  
Investment in privately held entities that do not report fair value, book value 400,500 368,700  
Investments in publicly traded companies      
Summary of Investment [Abstract]      
Investment at fair value, cost 188,653 203,467  
Cumulative unrealized gains on investments 24,262 50,377  
Cumulative unrealized losses on investments (107,248) (94,278)  
Limited partnerships      
Summary of Investment [Abstract]      
Investment at fair value, cost 518,074 507,059  
Cumulative unrealized gains on investments 126,077 192,468  
Cumulative unrealized losses on investments $ (34,285) $ (27,995)