INVESTMENTS, AT FAIR VALUE - Net Gains (Losses) from Investment Activities of Consolidated Funds (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gain (Loss) on Investments [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)
Investments and other financial instruments
Gain (Loss) on Investments [Line Items]
Net Realized Gain (Loss) on Investments	3,649,821	4,421,219	2,008,111
Net Change in Unrealized Appreciation (Depreciation) on Investments	2,152,662	952,478	(3,233,102)
Swaps | Consolidated funds | Net Investment Hedging | Not Designated as Hedging Instrument
Gain (Loss) on Investments [Line Items]
Net Realized Gain (Loss) on Investments	89,333	66,992	80,398
Net Change in Unrealized Appreciation (Depreciation) on Investments	(22,619)	33,445	(60,023)
Foreign currency forward contracts | Consolidated funds | Net Investment Hedging | Not Designated as Hedging Instrument
Gain (Loss) on Investments [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
Options and futures | Consolidated funds | Net Investment Hedging | Not Designated as Hedging Instrument
Gain (Loss) on Investments [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)