Fees and Related Party Transactions (Details)	6 Months Ended
	Jun. 30, 2012
Brokerage Fees [Abstract]
Advisory fees at annual rate of net asset value of fund (in hundredths)	2.00%
Sponsor fees at annual rate of net asset value of fund (in hundredths)	1.00%
Percentage of incentive allocation (in hundredths)	20.00%
Class 0 Units [Member]
Brokerage Fees [Abstract]
Advisory fees at annual rate of net asset value of fund (in hundredths)	2.00%
Class 2 Units [Member]
Brokerage Fees [Abstract]
Brokerage fees at annual rate	4.00%