STATEMENTS OF FINANCIAL CONDITION (Unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Trading Equity:
Unrestricted cash	$ 166,881,286	$ 171,164,335
Restricted cash	26,440,851	27,192,268
Total cash	193,322,137	198,356,603
Net unrealized gain (loss) on open contracts	1,943,202	2,551,354
Total Trading Equity	195,265,339	200,907,957
Interest receivable (MS&Co.)	11,606	6,032
Total Assets	195,276,945	200,913,989
Liabilities:
Redemptions payable	3,739,157	3,642,807
Accrued brokerage fees (MS&Co.)	957,030	994,527
Accrued management fees	290,756	302,574
Total Liabilities	4,986,943	4,939,908
Partners' Capital:
Limited Partners (6,633,154.296 and 6,979,883.723 Units, respectively)	188,279,807	193,760,270
General Partner (70,819.769 and 79,748.769 Units, respectively)	2,010,195	2,213,811
Total Partners' Capital	190,290,002	195,974,081
Total Liabilities and Partners' Capital	195,276,945	200,913,989
NET ASSET VALUE PER UNIT (in dollars per unit)	$ 28.38	$ 27.76
MS&Co. [Member]
Trading Equity:
Net unrealized gain (loss) on open contracts	1,943,202	3,072,667
MSIP [Member]
Trading Equity:
Net unrealized gain (loss) on open contracts	$ 0	$ (521,313)