Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 14, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Class 0 Units [Member]
Subsequent Event [Line Items]
Advisory fees at annual rate of net asset value of fund				1.75%	1.75%
Sponsor fees at annual rate of net asset value of fund		0.75%	0.75%
Class 2 Units [Member]
Subsequent Event [Line Items]
Advisory fees at annual rate of net asset value of fund				1.75%	1.75%
Sponsor fees at annual rate of net asset value of fund		1.50%	2.75%
Subsequent Event [Member]
Subsequent Event [Line Items]
Fund subscriptions	$ 0.0
Fund redemptions	$ 0.7
Subsequent Event [Member] | Class 0 Units [Member]
Subsequent Event [Line Items]
Advisory fees at annual rate of net asset value of fund	1.50%
Sponsor fees at annual rate of net asset value of fund	0.50%
Subsequent Event [Member] | Class 2 Units [Member]
Subsequent Event [Line Items]
Advisory fees at annual rate of net asset value of fund	1.50%
Sponsor fees at annual rate of net asset value of fund	1.25%