Fair Value Disclosures - Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Investments at fair value	$ 162,234	$ 165,894
Contingent consideration receivable	1,834	0
Liabilities:
Warrant liabilities, at fair value	2,934	0
Earn-out liability, at fair value	49,124	63,444
TRA liability, fair value	6,911	13,233
Earn-in consideration payable	969	1,830
Fair value, recurring
Assets:
Contingent consideration receivable	1,834
Total	164,068	165,894
Liabilities:
Warrant liabilities, at fair value	2,934
Earn-out liability, at fair value	49,124	63,444
TRA liability, fair value	6,911	13,233
Earn-in consideration payable	969	1,830
Total	59,938	78,507
Mutual funds
Assets:
Investments at fair value	110	75
Mutual funds | Fair value, recurring
Assets:
Investments at fair value	110	75
Exchange-traded funds
Assets:
Investments at fair value	109	108
Exchange-traded funds | Fair value, recurring
Assets:
Investments at fair value	109	108
Investments – external strategic managers | Fair value, recurring
Assets:
Investments at fair value	161,145	164,084
Investments - affiliated funds | Fair value, recurring
Assets:
Investments at fair value	$ 870	$ 1,627
Liabilities:
Redemption, required notice	30 days	30 days
Level 1 | Fair value, recurring
Assets:
Contingent consideration receivable	$ 0
Total	225	$ 190
Liabilities:
Warrant liabilities, at fair value	0
Earn-out liability, at fair value	0	0
TRA liability, fair value	0	0
Earn-in consideration payable	969	1,830
Total	969	1,830
Level 1 | Mutual funds | Fair value, recurring
Assets:
Investments at fair value	110	75
Level 1 | Exchange-traded funds | Fair value, recurring
Assets:
Investments at fair value	109	108
Level 1 | Investments – external strategic managers | Fair value, recurring
Assets:
Investments at fair value	6	7
Level 1 | Investments - affiliated funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 2 | Fair value, recurring
Assets:
Contingent consideration receivable	0
Total	0	0
Liabilities:
Warrant liabilities, at fair value	0
Earn-out liability, at fair value	0	0
TRA liability, fair value	0	0
Earn-in consideration payable	0	0
Total	0	0
Level 2 | Mutual funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 2 | Exchange-traded funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 2 | Investments – external strategic managers | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 2 | Investments - affiliated funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 3
Assets:
Contingent consideration receivable	1,834
Liabilities:
Warrant liabilities, at fair value	2,934
TRA liability, fair value	6,911	13,233
Level 3 | Fair value, recurring
Assets:
Contingent consideration receivable	1,834
Total	162,973	164,077
Liabilities:
Warrant liabilities, at fair value	2,934
Earn-out liability, at fair value	49,124	63,444
TRA liability, fair value	6,911	13,233
Earn-in consideration payable	0	0
Total	58,969	76,677
Level 3 | Mutual funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 3 | Exchange-traded funds | Fair value, recurring
Assets:
Investments at fair value	0	0
Level 3 | Investments – external strategic managers
Assets:
Investments at fair value	161,139	164,077
Level 3 | Investments – external strategic managers | Fair value, recurring
Assets:
Investments at fair value	161,139	164,077
Level 3 | Investments - affiliated funds | Fair value, recurring
Assets:
Investments at fair value	$ 0	$ 0