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Investments and Other Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gain (loss) | $ (8,536) | $ (6,875) |
Net unrealized holding gains (losses), income tax (benefit) expense | (2,549) | (2,054) |
Equity securities, gross realized gains | 2,218 | 661 | $ 263
Equity securities, gross realized losses | 1,550 | 349 | 773
Securities owned | 29,583 | 31,334 |
Cash equivalents fair value | 541,635 | 565,588 |
Available for sale debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale securities, gross realized gains | 475 |  |
Available-for-sale securities, gross realized losses |  | 215 | 602
Investment funds sponsored by LSV |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds sponsored by LSV | 8,129 | 7,316 |
Gains (losses) from the change in fair value of the funds | $ 813 | $ 950 | $ (550)

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