HEDGES AND OTHER DERIVATIVE FINANCIAL INSTRUMENTS - Consolidated Funds (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	$ 3,503,998	$ 4,560,782	$ 1,744,135
Net Change in Unrealized Appreciation (Depreciation) on Investments	1,843,469	835,160	(3,064,676)
Consolidated funds | Net Investment Hedging | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total Net Realized Gain (Loss) on Investments	(145,823)	139,563	(263,976)
Total Net Change in Unrealized Appreciation (Depreciation) on Investments	(309,193)	(117,318)	168,426
Consolidated funds | Net Investment Hedging | Foreign currency forward contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	(217,234)	85,773	(307,681)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(286,336)	(148,791)	233,816
Consolidated funds | Net Investment Hedging | Options and futures | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	(17,922)	(13,202)	(36,693)
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (238)	$ (1,972)	$ (5,367)