DEBT OBLIGATIONS AND CREDIT FACILITIES - Revolving Bank Credit Facilities and Term Loans Outstanding of Consolidated Funds (Detail)					12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended							12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended					12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013 Standby Letter of Credit USD ($)	Dec. 31, 2012 Standby Letter of Credit USD ($)	Dec. 31, 2013 Consolidated Funds USD ($)	Dec. 31, 2012 Consolidated Funds USD ($)	Dec. 31, 2013 Consolidated Funds Senior variable notes	Dec. 31, 2013 Consolidated Funds Credit facility USD ($)		Dec. 31, 2012 Consolidated Funds Credit facility USD ($)		Dec. 31, 2013 Consolidated Funds Senior variable rate notes 1 USD ($)		Dec. 31, 2012 Consolidated Funds Senior variable rate notes 1 USD ($)		Dec. 31, 2013 Consolidated Funds Senior variable rate notes 2 USD ($)		Dec. 31, 2012 Consolidated Funds Senior variable rate notes 2 USD ($)		Dec. 31, 2013 Consolidated Funds Senior variable rate notes 3 USD ($)		Dec. 31, 2012 Consolidated Funds Senior variable rate notes 3 USD ($)		Dec. 31, 2013 Consolidated Funds Senior variable rate notes 4 USD ($)		Dec. 31, 2012 Consolidated Funds Senior variable rate notes 4 USD ($)		Dec. 31, 2013 Consolidated Funds Senior variable rate notes 5 USD ($)		Dec. 31, 2012 Consolidated Funds Senior variable rate notes 5 USD ($)		Dec. 31, 2013 Consolidated Funds Revolving credit facility 1 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 1 USD ($)	Dec. 31, 2013 Consolidated Funds Multi-currency term loan USD ($)		Dec. 31, 2012 Consolidated Funds Multi-currency term loan USD ($)		Dec. 31, 2013 Consolidated Funds Revolving credit facility 2 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 2 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving credit facility 3 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 3 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving credit facility 4 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 4 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving credit facility 5 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 5 USD ($)	Dec. 31, 2013 Consolidated Funds Euro-denominated revolving credit facility USD ($)		Dec. 31, 2013 Consolidated Funds Euro-denominated revolving credit facility EUR (€)		Dec. 31, 2012 Consolidated Funds Euro-denominated revolving credit facility USD ($)	Dec. 31, 2013 Consolidated Funds Revolving credit facility 6 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 6 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving credit facility 7 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving credit facility 7 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving Credit Facility 8 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving Credit Facility 8 USD ($)	Dec. 31, 2013 Consolidated Funds Revolving Credit Facility 9 USD ($)		Dec. 31, 2012 Consolidated Funds Revolving Credit Facility 9 USD ($)	Dec. 31, 2013 South Grand MM CLO I, LLC entity	Dec. 31, 2013 Minimum Consolidated Funds Senior variable rate notes 5	Dec. 31, 2013 Maximum Consolidated Funds Senior variable rate notes 5
Line of Credit Facility [Line Items]
Senior notes, term					10 years
Number of variable interest entities that are consolidated (in number of entities)																																																																		1
Outstanding Amount			$ 2,297,181,000	$ 491,625,000		$ 434,000,000	[1]	$ 63,000,000	[1]	$ 249,500,000	[1]	$ 249,500,000	[1]	$ 402,375,000	[1]	$ 0	[1]	$ 498,916,000	[1]	$ 0	[1]	$ 64,500,000	[1]	$ 0	[1]	$ 0	[1],[2]	$ 0	[1],[2]	$ 400,000,000		$ 0	$ 0	[3]	$ 49,158,000	[3]	$ 67,000,000		$ 38,000,000	$ 0		$ 8,625,000	$ 0		$ 19,400,000	$ 0		$ 0	$ 13,090,000				$ 63,942,000	$ 2,800,000		$ 0	$ 165,000,000		$ 0	$ 0		$ 0	$ 0		$ 0
Facility Capacity						435,000,000	[1]			249,500,000	[1]			402,500,000	[1]			500,000,000	[1]			64,500,000	[1]			126,000,000	[1],[2]			500,000,000			275,000,000	[3]			150,000,000			125,000,000			55,000,000			40,000,000					100,000,000			10,000,000			350,000,000			20,000,000			30,000,000
LIBOR margin (as percent)						1.45%	[1],[4]			1.55%	[1],[4]			1.20%	[1],[4]			1.20%	[1],[4]			1.65%	[1],[4]							1.60%	[4]		3.00%	[3],[4]			1.75%	[4]		1.75%	[4]		2.00%	[4]		1.50%	[4]		1.75%	[4]	1.75%	[4]		2.25%	[4]		1.65%	[4]		2.00%	[4]		1.50%	[4]
Maturity						Nov. 14, 2018	[1]			Oct. 20, 2022	[1]			Jul. 20, 2023	[1]			Apr. 20, 2023	[1]			Jul. 20, 2023	[1]			Dec. 23, 2018	[1],[2]			Jun. 26, 2015							Dec. 15, 2014			May 20, 2014			Dec. 15, 2015			Dec. 05, 2014			Dec. 17, 2015		Dec. 17, 2015			Sep. 01, 2014			Mar. 22, 2015			Jan. 31, 2015			Dec. 11, 2015
Commitment Fee Rate (as a percent)																														0.25%							0.35%			0.35%			0.35%			0.30%			0.30%		0.30%			0.38%			0.25%			0.35%			0.20%
L/C fee (as a percent)																																											2.00%	[5]		1.50%	[5]		2.00%	[5]	2.00%	[5]
Outstanding amounts	$ 55,954,000	$ 76,975,000
Commitment fee payable on unused funds (as a percent)																																																																			0.00%	2.00%

[1] The credit facility is collateralized by the portfolio investments and cash and cash-equivalents of the fund.

[2] The LIBOR margin is determined based on a formula defined in the borrowing agreement which incorporates different borrowing values based on the characteristics of collateral investments purchased. The unused commitment fee rate ranges from 0% to 2.0%.

[3] The loan was fully repaid and terminated on September 20, 2013.

[4] The facilities bear interest, at the borrower's option, at (a) an annual rate of LIBOR plus the applicable margin or (b) an alternate base rate, as defined in the respective credit agreement.

[5] Certain facilities allow for the issuance of letters of credit at an applicable annual fee. As of December 31, 2013 and 2012, outstanding standby letters of credit totaled $55,954 and $76,975, respectively.