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Composition of Certain Financial Statement Captions - Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 160,943 $ 143,574
Fees earned, not billed 486,942 403,514
Other receivables 24,459 21,981
Gross receivables 672,344 569,069
Less: Allowance for doubtful accounts (2,228) (1,435)
Receivables, net $ 670,116 $ 567,634