Consolidation - Schedule of Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (98,111)	$ (129,450)	$ (104,869)	$ (96,266)	$ (110,399)	$ (113,718)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	10,294		1,223
Investments	23,032		30,985
Other assets	157		174
Notes payable	0		0
Securities purchased payable and other liabilities	(719)		(740)
Noncontrolling interests	(7,917)		(7,316)
Net interests in CIP	24,847		24,326
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	105,261		98,101
Investments	1,973,688		1,972,342
Other assets	30,041		41,985
Notes payable	(1,940,085)		(1,922,243)
Securities purchased payable and other liabilities	(80,817)		(89,167)
Noncontrolling interests	(3,676)		(4,363)
Net interests in CIP	84,412		96,655
GFs
Variable Interest Entity [Line Items]
Cash and cash equivalents	825		2,088
Investments	78,690		79,386
Other assets	2,427		1,076
Notes payable	0		0
Securities purchased payable and other liabilities	(2,290)		(616)
Noncontrolling interests	(31,180)		(23,327)
Net interests in CIP	$ 48,472		$ 58,607