DERIVATIVES AND HEDGING - Fair Value of Derivatives of Consolidated Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Fair Value	$ 17,946	$ 967
Liabilities
Fair Value	(12,383)	(20,984)
Consolidated Funds
Assets
Fair Value	6,733	508
Liabilities
Fair Value	(11,847)
Consolidated Funds | Foreign-currency forward contracts
Assets
Fair Value	5,062	482
Liabilities
Fair Value	(886)	(933)
Consolidated Funds | Total-return and interest-rate and credit default swaps
Assets
Fair Value	1,162
Liabilities
Fair Value	(4,335)
Consolidated Funds | Options and futures
Assets
Fair Value	509	26
Consolidated Funds | Warrants
Liabilities
Fair Value	(6,626)
Consolidated Funds | Not Designated as Hedging Instrument
Assets
Notional	438,170	51,205
Fair Value	6,733	508
Liabilities
Notional	(52,099)	(47,787)
Fair Value	(11,847)	(933)
Consolidated Funds | Not Designated as Hedging Instrument | Foreign-currency forward contracts
Assets
Notional	210,868	28,638
Fair Value	5,062	482
Liabilities
Notional	(24,845)	(47,787)
Fair Value	(886)	(933)
Consolidated Funds | Not Designated as Hedging Instrument | Total-return and interest-rate and credit default swaps
Assets
Notional	13,727
Fair Value	1,162
Liabilities
Notional	(27,254)
Fair Value	(4,335)
Consolidated Funds | Not Designated as Hedging Instrument | Options and futures
Assets
Notional	213,575	22,567
Fair Value	509	26
Liabilities
Notional	0	0
Fair Value	0	$ 0
Consolidated Funds | Not Designated as Hedging Instrument | Warrants
Assets
Notional	0
Fair Value	0
Liabilities
Notional	0
Fair Value	$ 6,626