Fair Value Measurements - Schedule of Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Cash equivalents	$ 331,918	$ 225,736
Investment securities - fair value
Fair value	110,561	83,771
Debt securities	32,054	1,456
Total assets measured at fair value	462,085	324,666
Liabilities
Total liabilities measured at fair value	20,000	36,100
Contingent consideration
Liabilities
Total liabilities measured at fair value	20,000	36,100
Sponsored funds
Investment securities - fair value
Fair value	56,383	63,296
Equity securities
Investment securities - fair value
Fair value	22,124	19,019
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	19,606	15,159
Level 1
Assets
Cash equivalents	331,918	225,736
Investment securities - fair value
Debt securities	0	0
Total assets measured at fair value	430,031	323,210
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	56,383	63,296
Level 1 \| Equity securities
Investment securities - fair value
Fair value	22,124	19,019
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	19,606	15,159
Level 2
Assets
Cash equivalents	0	0
Investment securities - fair value
Debt securities	2,403	1,456
Total assets measured at fair value	2,403	1,456
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	29,651	0
Total assets measured at fair value	29,651	0
Liabilities
Total liabilities measured at fair value	20,000	36,100
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	20,000	36,100
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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