Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) fund	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ 8,936,000	$ 14,539,000	$ (2,419,000)	$ 56,370,000
Cash collateral payable to trade counterparties	13,500,000		13,500,000		$ 8,400,000
Cash collateral received	1,600,000		1,600,000		4,200,000
Advisory fee receivables	119,817,000		119,817,000		127,040,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	1,800,000		1,800,000		14,000,000
Gains (losses) on derivative instruments	(3,300,000)	$ 4,900,000	(2,900,000)	$ 10,100,000
Cash collateral payable to trade counterparties	621,000		621,000		2,731,000
Cash collateral received	3,337,000		3,337,000		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	54,900,000,000		54,900,000,000		46,400,000,000
Maximum risk of loss in investment in VIEs	11,000,000		11,000,000		5,700,000
Advisory fee receivables	$ 99,300,000		$ 99,300,000		54,200,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			3
Seed investment, deconsolidated amount					$ 40,600,000