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Investments - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investments |  | $ 174,400,000 | $ 177,400,000 |
Proceeds from investments |  | 800,000 | 6,900,000 | $ 8,000,000
Non Marketable Equity Securities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investments |  | 124,100,000 | 124,100,000 |
Non Marketable Equity Securities | Series A Convertible Preferred Stock [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of shares acquired | 40,000,000 |  |  |
Investment acquired purchase price | $ 40,000,000 |  |  |
Dividend received |  | 8,000,000 | 8,000,000 | $ 8,000,000
Seed Capital Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investments |  | 26,400,000 | 23,100,000 |
Proceeds from investments |  |  | 3,600,000 |
Partnership interests in private equity funds |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investments |  | 4,300,000 | 8,600,000 |
Investments, fair value |  | 3,100,000 | 7,300,000 |
Equity method investments, fair value |  | $ 1,200,000 | $ 1,300,000 |

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