Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (139,147)	$ (138,738)	$ (138,965)	$ (131,525)	$ (112,482)	$ (115,513)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	798		787
Investments	19,049		21,544
Other assets	94		64
Notes payable	0		0
Securities purchased payable and other liabilities	(417)		(558)
Noncontrolling interests	(4,634)		(4,935)
Net interests in CIP	14,890		16,902
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	104,348		205,192
Investments	1,917,076		2,055,107
Other assets	15,920		43,327
Notes payable	(1,904,444)		(2,033,617)
Securities purchased payable and other liabilities	(65,314)		(184,214)
Noncontrolling interests	(6,997)		(8,350)
Net interests in CIP	60,589		77,445
Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	3,155		1,245
Investments	54,034		63,587
Other assets	1,027		819
Notes payable	0		0
Securities purchased payable and other liabilities	(159)		(296)
Noncontrolling interests	(8,416)		(7,481)
Net interests in CIP	$ 49,641		$ 57,874