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Investments - Summary of Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) investment | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) investment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 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 | $ 347,200 |  | $ 347,200 |  |
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 | 34,800 |  | $ 94,700 |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | 25,100 |  | 75,500 |  |
Equity in earnings (losses) of unconsolidated real estate joint ventures | 201 | $ 139 | (9,327) | $ 424 |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 1,182,936 |  | 1,182,936 |  | $ 1,207,146
Cumulative unrealized gains on investments | 180,375 |  | 180,375 |  | 228,100
Cumulative unrealized losses on investments | (152,118) |  | (152,118) |  | (144,489)
Investments accounted for under the equity method | 326,445 |  | 326,445 |  | 186,228
Total investments held at adjusted carrying value or fair value | 1,537,638 |  | 1,537,638 |  | 1,476,985
Investment Income, Net [Abstract] |  |  |  |  |
Realized gains | 9,646 | 12,632 | 19,115 | 47,336 |
Unrealized gains (losses) | 18,515 | 2,610 | (71,568) | (32,470) |
Investment income (loss) | 28,161 | $ 15,242 | (52,453) | 14,866 |
Equity Method Investments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Equity in earnings (losses) of unconsolidated real estate joint ventures |  |  | (1,800) |  |
Investments in publicly traded companies |  |  |  |  |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 197,229 |  | 197,229 |  | 188,653
Cumulative unrealized gains on investments | 28,964 |  | 28,964 |  | 24,262
Cumulative unrealized losses on investments | (101,901) |  | (101,901) |  | (107,248)
Investments at fair value, book value | 124,292 |  | $ 124,292 |  | 105,667
Investments in privately held entities that report NAV |  |  |  |  |
Schedule of Investments |  |  |  |  |
Weighted-average remaining liquidation term (in years) |  |  | 7 years 10 months 24 days |  |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 482,734 |  | $ 482,734 |  | 518,074
Cumulative unrealized gains on investments | 98,002 |  | 98,002 |  | 126,077
Cumulative unrealized losses on investments | (40,603) |  | (40,603) |  | (34,285)
Investments at fair value, book value | 540,133 |  | 540,133 |  | 609,866
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 | (112,400) |  | (112,400) |  |
Investments in privately held entities that do not report NAV, cumulative upward price adjustment | 53,400 |  | 53,400 |  |
Investments in privately held entities that do not report NAV, cumulative downward price adjustment | (9,600) |  | (9,600) |  |
Investments in privately held entities that do not report NAV, cumulative impairment loss | (156,200) |  | (156,200) |  |
Equity Securities without Readily Determinable Fair Value, Net Upward (Downward) Price Adjustment, Annual Amount |  |  | (79,100) | (27,300) |
Investments in privately held entities that do not report NAV, annual upward price adjustment |  |  | 14,900 | 17,600 |
Investments in privately held entities that do not report NAV, annual downward price adjustment |  |  | 94,000 | 44,900 |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 80,454 |  | 80,454 |  | 99,932
Cumulative unrealized gains on investments | 53,409 |  | 53,409 |  | 77,761
Cumulative unrealized losses on investments | (9,614) |  | (9,614) |  | (2,956)
Investments in privately held entities that do not report fair value, book value | 124,249 |  | 124,249 |  | 174,737
Investments in privately held entities that do not report NAV | Entities without observable price changes |  |  |  |  |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 422,519 |  | 422,519 |  | 400,487
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 | $ 422,519 |  | 422,519 |  | $ 400,487
Total investments held |  |  |  |  |
Investment Income, Net [Abstract] |  |  |  |  |
Unrealized gains (losses) |  |  | $ 16,600 | $ 15,700 |

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