Summary of Significant Accounting Policies (Details) (USD $)	2 Months Ended	10 Months Ended	12 Months Ended			12 Months Ended				12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended
	Feb. 29, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012 General Partner [Member]	Dec. 31, 2012 ERISA/IRA Investors [Member]	Dec. 31, 2012 Capital Unit, Class A [Member]	Dec. 31, 2011 Capital Unit, Class A [Member]	Dec. 31, 2010 Capital Unit, Class A [Member]	Dec. 31, 2012 Capital Unit, Class A [Member] Maximum [Member]	Dec. 31, 2012 Capital Unit, Class B [Member]	Dec. 31, 2011 Capital Unit, Class B [Member]	Dec. 31, 2010 Capital Unit, Class B [Member]	Dec. 31, 2012 Capital Unit, Class B [Member] Minimum [Member]	Dec. 31, 2012 Capital Unit, Class B [Member] Maximum [Member]	Dec. 31, 2012 Capital Unit Class C [Member]	Dec. 31, 2011 Capital Unit Class C [Member]	Dec. 31, 2010 Capital Unit Class C [Member]	Dec. 31, 2012 Capital Unit Class C [Member] Minimum [Member]	Dec. 31, 2012 Capital Unit Class C [Member] Maximum [Member]	Dec. 31, 2012 Capital Unit Class D [Member]	Dec. 31, 2011 Capital Unit Class D [Member]	Dec. 31, 2010 Capital Unit Class D [Member]	Mar. 01, 2009 Capital Unit Class D [Member]	Dec. 31, 2012 Capital Unit Class D [Member] Minimum [Member]	Dec. 31, 2012 Capital Unit Class Z [Member]	Dec. 31, 2011 Capital Unit Class Z [Member]	Dec. 31, 2010 Capital Unit Class Z [Member]
Schedule of Equity Method Investments [Line Items]
Partnership payments to Ceres for general partner administrative fee, rate by investment, monthly basis (in hundredths)			0.0833%
Partnership payments to Ceres for general partner administrative fee, rate by investment, annual basis (in hundredths)			1.00%
Applicable rate payable by each limited partner to placement agent [Abstract]
Aggregate Investment									$ 4,999,999				$ 250,000	$ 499,999				$ 500,000	$ 4,999,999					$ 5,000,000
Aggregate Investment																									All
Placement agent fee rate, annualized basis (in hundredths)						2.00%				1.50%					1.00%					0.75%					0.00%
Placement agent fee rate, monthly basis (in hundredths)						0.167%				0.125%					0.083%					0.063%					0.00%
Partnership payments to Ceres for administrative fee, rate by investment, monthly basis (in hundredths)			0.0333%
Partnership payments to Ceres for administrative fee, rate by investment, annual basis (in hundredths)			0.40%
Number of share classes	4	2	4
Initial offer price per capital units (in dollars per unit)		$ 1,000	$ 1,000																				$ 1,137
Minimum partnership subscription amount		25,000	25,000		10,000
Incremental additional subscriptions		$ 10,000	$ 10,000
Limited partners unit that can be redeemed (in hundredths)		100.00%	100.00%
Minimum investment to be maintained by investor (in units)		3	3
Period to pay all redemptions			10 days
Units outstanding by share class [Roll Forward]
Units, period start (in units)						34,210.600	39,904.989	37,990.609		6,075.289	7,784.920	8,032.706			9,546.728	16,438.640	15,543.827			59.829	1,818.843	11,394.809			957.352	975.359	975.295
Subscriptions (in units)						519.393	4,234.446	10,083.111		126.801	1,662.825	2,686.485			0	605.343	4,664.661			0	0	59.828			0	0	157.826
Redemptions (in units)						(10,798.012)	(9,928.835)	(8,168.731)		(2,060.668)	(3,372.456)	(2,934.271)			(1,686.454)	(7,497.255)	(3,769.848)			(36.817)	(1,759.014)	(9,635.794)			(473.978)	(18.007)	(157.762)
Units, period end (in units)						23,931.981	34,210.600	39,904.989		4,141.422	6,075.289	7,784.920			7,860.274	9,546.728	16,438.640			23.012	59.829	1,818.843			483.374	957.352	975.359
Notice period to terminate partnership				60 days