Fair Value Measurements - Schedule of Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Cash equivalents	$ 164,878	$ 197,240
Investment securities - fair value
Fair value	127,914	97,304
Debt securities	25,918
Total assets measured at fair value	307,719	307,226
Liabilities
Total liabilities measured at fair value	34,408	56,200
Contingent consideration
Liabilities
Total liabilities measured at fair value	34,408	56,200
Sponsored funds
Investment securities - fair value
Fair value	80,303	77,433
Equity securities
Investment securities - fair value
Fair value	21,693	19,871
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	14,927	12,682
Level 1
Assets
Cash equivalents	164,878	197,240
Investment securities - fair value
Debt securities	259
Total assets measured at fair value	282,060	307,226
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	80,303	77,433
Level 1 \| Equity securities
Investment securities - fair value
Fair value	21,693	19,871
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	14,927	12,682
Level 2
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	1,216
Total assets measured at fair value	1,216	0
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	24,443
Total assets measured at fair value	24,443	0
Liabilities
Total liabilities measured at fair value	34,408	56,200
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	34,408	56,200
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

Fair value portion of asset recognized for present right to economic benefit.

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