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Marketable Securities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]          
Cash equivalents at fair value $ 633,780   $ 633,780   $ 565,588
Net unrealized gains (loss) (5,580)   (5,580)   (6,875)
Net unrealized gains (losses) income tax expense (benefit) (1,667)   (1,667)   (2,054)
Mutual funds and equities, gross realized gains     1,651    
Mutual funds and equities, gross realized loss     1,416    
Other long-term investments 49,675   49,675   110,781
Securities owned 30,289   30,289   31,334
Investment Funds Sponsored by LSV          
Schedule of Investments [Line Items]          
Other long-term investments 8,410   8,410   $ 7,316
Unrealized gains (losses) on investments $ 673 $ 66 $ 1,094 $ 472