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Fair Value Of Financial Instruments (Fair Value of Derivative Instruments) (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Futures [Member] | Commodity Contracts [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (47,173,255)	$ (167,617,930)

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4B



-Subparagraph (c)(2)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

+ Details

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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- Details

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