Related-Party Transactions - Summary of Related-Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related party assets
Cash and cash equivalents	$ 188,248		$ 188,248		$ 123,547
Related party revenue
Total revenue	225,628	$ 209,688	661,106	$ 615,234
Investment Management Fees
Related party revenue
Total revenue	177,809	163,953	520,757	480,199
Fund Administration and Distribution Fees
Related party revenue
Total revenue	47,819	45,735	140,349	135,035
VCH
Related party assets
Cash and cash equivalents	169,541		169,541		109,183
Receivables (investment management fees)	48,676		48,676		46,217
Receivables (fund administration and distribution fees)	15,096		15,096		14,238
Prepaid expenses	483		483		730
Investments (investments in proprietary funds, fair value)	596		596		534
Investments (deferred compensation plan investments, fair value)	34,012		34,012		31,143
Total	268,404		268,404		202,045
Related party liabilities
Accounts payable and accrued expenses (fund reimbursements)	5,549		5,549		$ 5,641
Related party revenue
Total revenue	183,330	170,580	535,377	501,773
Related party expense
General and administrative	119	117	337	366
Related party other income (expense)
Interest income and other income (expense)	3,385	465	7,953	3,260
VCH | Investment Management Fees
Related party revenue
Total revenue	135,511	124,845	395,028	366,738
VCH | Fund Administration and Distribution Fees
Related party revenue
Total revenue	$ 47,819	$ 45,735	$ 140,349	$ 135,035