Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) fund	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (861,000)	$ 22,099,000	$ (11,355,000)	$ 41,831,000
Cash collateral payable to trade counterparties	7,900,000		7,900,000		$ 8,400,000
Cash collateral received	5,600,000		5,600,000		4,200,000
Advisory fee receivables	125,299,000		125,299,000		127,040,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	1,500,000		1,500,000		14,000,000
Gains (losses) on derivative instruments	(1,300,000)	$ 5,700,000	400,000	$ 5,200,000
Cash collateral payable to trade counterparties	603,000		603,000		2,731,000
Cash collateral received	2,181,000		2,181,000		5,444,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	0		0
Cash collateral payable to trade counterparties	0		0
Cash collateral received	0		0
Non-consolidated VIEs
Derivative [Line Items]
Net assets	53,900,000,000		53,900,000,000		46,400,000,000
Maximum risk of loss in investment in VIEs	13,000,000		13,000,000		5,700,000
Advisory fee receivables	$ 60,800,000		$ 60,800,000		54,200,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			3
Seed investment, deconsolidated amount					$ 40,600,000