SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The table below sets forth the rights of setoff and related arrangements associated with the Company's derivative instruments, which are primarily held by the consolidated funds, as of March 31, 2013 and December 31, 2012:

	Gross Amounts of Assets (Liabilities)			Gross Amounts Offset in Assets (Liabilities)			Net Amounts of Assets (Liabilities) Presented			Gross Amounts Not Offset in Statements of Financial Condition						Net Amount
As of March 31, 2013										Derivative Assets (Liabilities)			Cash Collateral Received (Pledged)
Derivative Assets:
Foreign currency forward contracts	$	5,148		$	1,821		$	3,327		$	1,528		$	—		$	1,799
Derivative assets of consolidated funds:
Foreign currency forward contracts	74,034			—			74,034			11,099			—			62,935
Total-return, credit-default and interest-rate swaps	58,922			—			58,922			419			—			58,503
Options and futures	5,750			—			5,750			—			—			5,750
Subtotal	138,706			—			138,706			11,518			—			127,188
Total	$	143,854		$	1,821		$	142,033		$	13,046		$	—		$	128,987
Derivative Liabilities:
Foreign currency forward contracts	$	(2,596	)	$	(1,821	)	$	(775	)	$	(775	)	$	—		$	—
Interest-rate swaps	(7,400		)	—			(7,400		)	(753		)	—			(6,647		)
Subtotal	(9,996		)	(1,821		)	(8,175		)	(1,528		)	—			(6,647		)
Derivative liabilities of consolidated funds:
Foreign currency forward contracts	(12,027		)	—			(12,027		)	(11,099		)	—			(928		)
Total-return, credit-default and interest-rate swaps	(8,713		)	—			(8,713		)	(419		)	(1,419		)	(6,875		)
Options and futures	(3,328		)	—			(3,328		)	—			(373		)	(2,955		)
Subtotal	(24,068		)	—			(24,068		)	(11,518		)	(1,792		)	(10,758		)
Total	$	(34,064	)	$	(1,821	)	$	(32,243	)	$	(13,046	)	$	(1,792	)	$	(17,405	)

	Gross Amounts of Assets (Liabilities)			Gross Amounts Offset in Assets (Liabilities)			Net Amounts of Assets (Liabilities) Presented			Gross Amounts Not Offset in Statements of Financial Condition						Net Amount
As of December 31, 2012										Derivative Assets (Liabilities)			Cash Collateral Received (Pledged)
Derivative Assets:
Foreign currency forward contracts	$	1,558		$	1,558		$	—		$	(549	)	$	—		$	549
Derivative assets of consolidated funds:
Foreign currency forward contracts	52,663			—			52,663			34,139			—			18,524
Total-return, credit-default and interest-rate swaps	48,727			—			48,727			312			340			48,075
Options and futures	6,170			—			6,170			—			—			6,170
Subtotal	107,560			—			107,560			34,451			340			72,769
Total	$	109,118		$	1,558		$	107,560		$	33,902		$	340		$	73,318
Derivative Liabilities:
Foreign currency forward contracts	$	(2,361	)	$	(1,558	)	$	(803	)	$	654		$	—		$	(1,457	)
Interest-rate swaps	(7,900		)	—			(7,900		)	(105		)	—			(7,795		)
Subtotal	(10,261		)	(1,558		)	(8,703		)	549			—			(9,252		)
Derivative liabilities of consolidated funds:
Foreign currency forward contracts	(146,526		)	—			(146,526		)	(34,139		)	(632		)	(111,755		)
Total-return, credit-default and interest-rate swaps	(9,561		)	—			(9,561		)	(312		)	(1,828		)	(7,421		)
Options and futures	(560		)	—			(560		)	—			(47		)	(513		)
Subtotal	(156,647		)	—			(156,647		)	(34,451		)	(2,507		)	(119,689		)
Total	$	(166,908	)	$	(1,558	)	$	(165,350	)	$	(33,902	)	$	(2,507	)	$	(128,941	)