Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Subsequent Event [Member]
Subsequent Event [Line Items]
Fund subscriptions	$ 0.6
Fund redemptions	$ 10.5
Class 0 Units [Member]
Subsequent Event [Line Items]
Brokerage fees at annual rate (in hundredths)	2.00%
Class 0 Units [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Brokerage fees at annual rate (in hundredths)	0.00%
Class 2 Units [Member]
Subsequent Event [Line Items]
Brokerage fees at annual rate (in hundredths)	4.00%
Class 2 Units [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Brokerage fees at annual rate (in hundredths)	2.00%