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Investments - Summary of Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) investment | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) investment | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Investments |  |  |  |  |
Cost method investment ownership percentage | 10.00% |  | 10.00% |  |
Number of equity method investments | investment | 9 |  | 9 |  |
Fair Value, Investments, Privately Held Entities that Calculate NAV, Unfunded Commitments | $ 381,500 |  | $ 381,500 |  |
Limited partnership maximum expiration terms |  |  | 12 years |  |
Weighted-average remaining liquidation term (in years) |  |  | 5 years 6 months |  |
Limited partnership liquidation, expected initial term (in years) |  |  | 10 years |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | (28,500) |  | $ 51,500 |  |
Equity Securities, FV-NI, Realized Gain | 25,000 |  | 68,400 |  |
Income from equity method investments | 242 | $ 40 | 617 | $ 473 |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 1,181,833 |  | 1,181,833 |  | $ 1,152,613
Cumulative unrealized gains on investments | 311,448 |  | 311,448 |  | 506,404
Cumulative unrealized losses on investments | (135,425) |  | (135,425) |  | (109,402)
Investments accounted for under the equity method | 73,910 |  | 73,910 |  | 65,459
Total investments held at adjusted carrying value or fair value | 1,431,766 |  | 1,431,766 |  | 1,615,074
Investment Income, Net [Abstract] |  |  |  |  |
Realized (losses) gains | (3,470) | 24,210 | 16,903 | 75,971 |
Unrealized losses | (77,202) | (56,515) | (220,954) | (388,076) |
Investment loss | (80,672) | $ (32,305) | (204,051) | (312,105) |
Equity Method Investments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Income from equity method investments |  |  | (2,400) |  |
Investments in publicly traded companies |  |  |  |  |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 197,822 |  | 197,822 |  | 210,986
Cumulative unrealized gains on investments | 41,225 |  | 41,225 |  | 96,271
Cumulative unrealized losses on investments | (109,461) |  | (109,461) |  | (100,118)
Investments at fair value, book value | 129,586 |  | $ 129,586 |  | 207,139
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 | 492,151 |  | $ 492,151 |  | 452,391
Cumulative unrealized gains on investments | 191,378 |  | 191,378 |  | 315,071
Cumulative unrealized losses on investments | (24,740) |  | (24,740) |  | (7,710)
Investments at fair value, book value | 658,789 |  | 658,789 |  | 759,752
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 | (31,100) |  | (31,100) |  |
Investments in privately held entities that do not report NAV, cumulative upward price adjustment | 78,800 |  | 78,800 |  |
Investments in privately held entities that do not report NAV, cumulative downward price adjustment | (1,200) |  | (1,200) |  |
Investments in privately held entities that do not report NAV, cumulative impairment loss | (108,700) |  | (108,700) |  |
Annual adjustments recognized on investments in privately held entities that do not report NAV |  |  | 57,700 | 1,800 |
Investments in privately held entities that do not report NAV, annual upward price adjustment |  |  | 16,500 | 25,200 |
Investments in privately held entities that do not report NAV, annual downward price adjustment |  |  | 74,200 | 23,400 |
Summary of Investment [Abstract] |  |  |  |  |
Investment at fair value, cost | 104,105 |  | 104,105 |  | 100,296
Cumulative unrealized gains on investments | 78,845 |  | 78,845 |  | 95,062
Cumulative unrealized losses on investments | (1,224) |  | (1,224) |  | (1,574)
Investments in privately held entities that do not report fair value, book value | 181,726 |  | 181,726 |  | 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 | 387,755 |  | 387,755 |  | 388,940
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 | $ 387,755 |  | 387,755 |  | $ 388,940
Total investments held |  |  |  |  |
Investment Income, Net [Abstract] |  |  |  |  |
Unrealized losses |  |  | $ (97,800) | $ (301,800) |

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