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Composition of Certain Financial Statement Captions - Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 174,091 $ 115,356
Fees earned, not billed 418,561 372,291
Other receivables 18,975 14,450
Gross receivables 611,627 502,097
Less: Allowance for doubtful accounts (1,833) (663)
Receivables, net $ 609,794 $ 501,434