STATEMENTS OF FINANCIAL CONDITION (Unaudited) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Trading Equity:
Unrestricted cash	$ 197,600,846	$ 250,786,399
Restricted cash	37,983,324	37,327,727
Total cash	235,584,170	288,114,126
Total net unrealized gain (loss) on open contracts	(1,510,798)	6,401,899
Total Trading Equity	234,073,372	294,516,025
Interest receivable (MS&Co. & MSSB)	13,506	808
Total Assets	234,086,878	294,516,833
Liabilities:
Redemptions payable	3,930,462	6,464,963
Accrued brokerage fees (MS&Co.)	1,212,636	1,459,689
Accrued management fees	368,977	447,773
Total Liabilities	5,512,075	8,372,425
Partners' Capital:
Limited Partners (7,518,538.446 and 9,059,136.131 Units, respectively)	226,175,768	283,036,281
General Partner (79,748.769 and 99,481.769 Units, respectively)	2,399,035	3,108,127
Total Partners' Capital	228,574,803	286,144,408
Total Liabilities and Partners' Capital	234,086,878	294,516,833
NET ASSET VALUE PER UNIT (in dollars per unit)	$ 30.08	$ 31.24
MS&Co. [Member]
Trading Equity:
Total net unrealized gain (loss) on open contracts	(232,193)	6,712,081
MSIP [Member]
Trading Equity:
Total net unrealized gain (loss) on open contracts	$ (1,278,605)	$ (310,182)