Fees and Related Party Transactions (Details)	9 Months Ended
	Sep. 30, 2012
Fees and Related Party Transactions [Abstract]
Annual advisory fee percentage (in hundredths)	2.00%
Annual sponsor fee percentage (in hundredths)	1.00%
Incentive allocation percentage (in hundredths)	20.00%
Class 0 Units [Member]
Brokerage Fees [Abstract]
Annual brokerage fee percentage (in hundredths)	2.00%
Class 2 Units [Member]
Brokerage Fees [Abstract]
Annual brokerage fee percentage (in hundredths)	4.00%