COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)	12 Months Ended					12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Consolidated funds USD ($)	Dec. 31, 2012 Consolidated funds USD ($)	Dec. 31, 2013 Revolving credit facility Line of Credit Consolidated funds USD ($)	Dec. 31, 2012 Revolving credit facility Line of Credit Consolidated funds USD ($)	Dec. 20, 2012 Revolving credit facility Line of Credit Consolidated funds GBP (£)	Dec. 31, 2013 Libor or Euribor Consolidated funds
Contingencies And Commitments [Line Items]
Claims for damages	$ 800,000,000
Accrued incentives (fund level)	2,211,979,000	2,137,798,000	1,686,967,000
Compensation expense related to accrued incentives (fund level)	994,879,000	855,604,000	659,256,000
Capital commitments	327,254,000	265,401,000
Commitments				1,307,880,000	912,001,000
Credit agreement								200,000,000
Line of Credit Facility, Contractual Term (in years)						3 years
Commitment fee payable on unused funds (as a percent)						1.00%
LIBOR margin (as percent)									2.00%
Outstanding amount				$ 2,297,181,000	$ 491,625,000	$ 317,000,000	$ 0