XML 22 R29.htm IDEA: XBRL DOCUMENT v2.4.1.9

Fair Value Of Financial Instruments (Fair Value of Derivative Instruments) (Detail) (Futures [Member], Commodity Contracts [Member], Assets [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Futures [Member] | Commodity Contracts [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (115,984,140)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_AssetsTotalMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	$ (167,617,930)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_AssetsTotalMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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=35706170&loc=SL5624163-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration