Variable Interest Entities - Schedule of Supplemental Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 382,508	$ 302,154	$ 345,335	$ 855,564
Investments (Note 3)	2,266,403	2,492,268
Other assets	138,914	52,504
Total assets	3,419,182	3,513,318
Due to custodian	13,483	9,121
Other	256	697
Total other liabilities	670,155	725,766
Marketable equity securities
Variable Interest Entity [Line Items]
Securities sold short	115,101	83,269
Variable Interest Entity, Primary Beneficiary | Corporate and Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	87,119	62,630
Investments (Note 3)	236,340	146,423
Other assets	2,135	724
Total assets	325,594	209,777
Due to custodian	13,483	9,121
Other	256	697
Total other liabilities	88,026	57,748
Variable Interest Entity, Primary Beneficiary | Corporate and Other | Marketable equity securities | Short
Variable Interest Entity [Line Items]
Securities sold short	$ 74,287	$ 47,930