Fair Value Measurements - Schedule of Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets
Cash equivalents	$ 140,120	$ 340,276
Investment securities - fair value
Fair value	49,700	76,462
Debt securities	2,773	2,546
Total assets measured at fair value	220,402	436,828
Liabilities
Total liabilities measured at fair value	114,697	20,800
Contingent consideration
Liabilities
Total liabilities measured at fair value	114,697	20,800
Sponsored funds
Investment securities - fair value
Fair value	27,923	51,013
Equity securities
Investment securities - fair value
Fair value	19,004	22,903
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	30,582	20,090
Level 1
Assets
Cash equivalents	140,120	340,276
Investment securities - fair value
Debt securities	0	0
Total assets measured at fair value	217,629	434,282
Liabilities
Total liabilities measured at fair value	0	0
Level 1 | Contingent consideration
Liabilities
Total liabilities measured at fair value	0	0
Level 1 | Sponsored funds
Investment securities - fair value
Fair value	27,923	51,013
Level 1 | Equity securities
Investment securities - fair value
Fair value	19,004	22,903
Level 1 | Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	30,582	20,090
Level 2
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	2,773	2,546
Total assets measured at fair value	2,773	2,546
Liabilities
Total liabilities measured at fair value	0	0
Level 2 | Contingent consideration
Liabilities
Total liabilities measured at fair value	0	0
Level 2 | Sponsored funds
Investment securities - fair value
Fair value	0	0
Level 2 | Equity securities
Investment securities - fair value
Fair value	0	0
Level 2 | Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	0	0
Level 3
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	0	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	114,697	20,800
Level 3 | Contingent consideration
Liabilities
Total liabilities measured at fair value	114,697	20,800
Level 3 | Sponsored funds
Investment securities - fair value
Fair value	0	0
Level 3 | Equity securities
Investment securities - fair value
Fair value	0	0
Level 3 | Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	$ 0	$ 0