Statements of Financial Condition (USD $)	Mar. 31, 2012	Dec. 31, 2011
Trading Equity:
Unrestricted cash	$ 235,611,738	$ 250,786,399
Restricted cash	36,700,883	37,327,727
Total cash	272,312,621	288,114,126
Net unrealized gain on open contracts (MS&Co.)	3,546,073	6,712,081
Net unrealized gain (loss) on open contracts (MSIP)	9,200	(310,182)
Total net unrealized gain on open contracts	3,555,273	6,401,899
Total Trading Equity	275,867,894	294,516,025
Interest receivable (MSSB)	15,342	808
Total Assets	275,883,236	294,516,833
LIABILITIES
Redemptions payable	5,123,813	6,464,963
Accrued brokerage fees (MS&Co.)	1,409,076	1,459,689
Accrued management fees	431,093	447,773
Total Liabilities	6,963,982	8,372,425
PARTNERS' CAPITAL
Limited Partners	265,827,792	283,036,281
General Partner	3,091,462	3,108,127
Total Partners' Capital	268,919,254	286,144,408
Total Liabilities and Partners' Capital	$ 275,883,236	$ 294,516,833
NET ASSET VALUE PER UNIT (in dollars per unit)	$ 31.08	$ 31.24