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Investments - Summary of Investments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
investment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]      
Cost method investment ownership percentage 10.00%    
Number Of Equity Method Investments | investment 9    
Investments accounted for under the equity method $ 75,498 $ 65,459  
Fair Value, Investments, Privately Held Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 382,200    
Limited Partnership Maximum Expiration Terms 11 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 $ 80,600    
Investments in privately held entities that do not report NAV, impairment loss (74,600)    
Unrealized (losses) gains (201,475) (412,193) $ 43,632
Equity in earnings of unconsolidated real estate joint ventures 980 645 12,255
Summary of Investment [Abstract]      
Investment at fair value, cost 1,177,072 1,152,613  
Cumulative unrealized gains on investments 320,445 506,404  
Cumulative unrealized losses on investments (123,497) (109,402)  
Total investments held at adjusted carrying value or fair value 1,449,518 1,615,074  
Investment (loss) income (195,397) (331,758) 259,477
Equity Method Investments      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated real estate joint ventures (4,400)    
Investments in publicly traded companies      
Summary of Investment [Abstract]      
Investment at fair value, cost 203,467 210,986  
Cumulative unrealized gains on investments 50,377 96,271  
Cumulative unrealized losses on investments (94,278) (100,118)  
Investment at fair value, book value $ 159,566 207,139  
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, cost $ 507,059 452,391  
Cumulative unrealized gains on investments 192,468 315,071  
Cumulative unrealized losses on investments (27,995) (7,710)  
Investment at fair value, book value 671,532 759,752  
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 (50,200)    
Investment in privately held entities that do not report NAV, upward price adjustment 77,600    
Investment in privately held entities that do not report NAV, downward price adjustment (1,200)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (126,500)    
Annual adjustments recognized on investments in privately held entities that do not report NAV (77,700) 18,300 33,300
Investments in privately held entities that do not report NAV, annual upward price adjustment 16,800 26,300 32,700
Investments in privately held entities that do not report NAV, annual downward price adjustment (94,600) (44,600) (66,000)
Summary of Investment [Abstract]      
Investment at fair value, cost 97,892 100,296  
Cumulative unrealized gains on investments 77,600 95,062  
Cumulative unrealized losses on investments (1,224) (1,574)  
Investment in privately held entities that do not report fair value, book value 174,268 193,784  
Investments in privately held entities that do not report NAV | Entities without observable price changes      
Summary of Investment [Abstract]      
Investment at fair value, cost 368,654 388,940  
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 368,654 388,940  
Total investments held      
Schedule of Investments [Line Items]      
Unrealized (losses) gains $ (58,800) $ (276,500) $ 109,400