Fair Value Measurements and Disclosures (Details) (Fair Value Measurement on Recurring Basis [Member], USD $)	Dec. 31, 2012	Dec. 31, 2011
Investment in TT II, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	$ 12,246,448	$ 14,111,867
Investment in WNT I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	7,072,401	8,959,457
Investment in Chesapeake I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	4,408,930	4,910,449
Investment in Rotella I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	3,383,788	5,082,011
Investment in Kaiser I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	3,186,918	10,573,213
Investment in Augustus I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	2,433,314	5,112,295
Investment in GLC I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	2,359,140	3,942,919
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in TT II, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in WNT I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in Chesapeake I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in Rotella I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in Kaiser I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in Augustus I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Unadjusted Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in GLC I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Other Observable Inputs (Level 2) [Member] | Investment in TT II, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	12,246,448	14,111,867
Significant Other Observable Inputs (Level 2) [Member] | Investment in WNT I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	7,072,401	8,959,457
Significant Other Observable Inputs (Level 2) [Member] | Investment in Chesapeake I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	4,408,930	4,910,449
Significant Other Observable Inputs (Level 2) [Member] | Investment in Rotella I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	3,383,788	5,082,011
Significant Other Observable Inputs (Level 2) [Member] | Investment in Kaiser I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	3,186,918	10,573,213
Significant Other Observable Inputs (Level 2) [Member] | Investment in Augustus I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	2,433,314	5,112,295
Significant Other Observable Inputs (Level 2) [Member] | Investment in GLC I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	2,359,140	3,942,919
Significant Unobservable Inputs (Level 3) [Member] | Investment in TT II, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in WNT I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in Chesapeake I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in Rotella I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in Kaiser I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in Augustus I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investment in GLC I, LLC [Member]
Assets [Abstract]
Investments in Affiliated Trading Companies, at fair value	$ 0	$ 0