2.4.0.80010 - Statement - STATEMENTS OF FINANCIAL CONDITIONtruefalsefalse1false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0001309136instant2013-06-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012http://www.sec.gov/CIK0001309136instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3mlwf_EquityInCommodityTradingAccountsAbstractmlwf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Equity in commodity trading accounts:2false 4mlwf_CashAndRestrictedCashmlwf_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10737107191073710719USD$falsetruefalse2truefalsefalse10947478641094747864USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis element represents the cash available for day-to-day operating needs and carrying amounts of cash and cash equivalent items which are restricted for withdrawal or usage. 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For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.No definition available.false2Cash (including restricted cash of $59,637,436 for 2013 and $88,048,482 for 2012)3false 4mlwf_NetUnrealizedProfitOnOpenFuturesContractsmlwf_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1900757119007571falsefalsefalse2truefalsefalse1318119213181192falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the net unrealized profits on open futures contracts which arise on an account of translation difference and the impact of market and credit risk.No definition available.false2Net unrealized profit on open futures contracts4false 4mlwf_NetUnrealizedProfitOnOpenForwardsContractsmlwf_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse18785811878581falsefalsefalse2truefalsefalse27872072787207falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the net unrealized profits on open forwards contracts which arise on an account of translation difference and the impact of market and credit risk.No definition available.false2Net unrealized profit on open forwards contracts5false 3us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse318451318451falsefalsefalse2truefalsefalse872010872010falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2TOTAL ASSETS8true 3us-gaap_LiabilitiesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0LIABILITIES:9false 4us-gaap_PayablesToBrokerDealersAndClearingOrganizationsus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse73017301falsefalsefalse2truefalsefalse59755975falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate amounts payable to broker-dealers and clearing organizations include amounts payable for securities failed to receive, certain deposits received for securities loaned, amounts payable to clearing organizations on open transactions, and floor-brokerage payables. In addition, the net receivable or payable arising from unsettled trades would be reflected in those captions. A broker-dealer that purchases securities, either for its own account or for a customer's account, but does not receive the securities on the settlement date records the amount of money representing the purchase price of the securities, including any accrued interest, as a liability to the selling broker-dealer. This liability is paid when the securities are received by the purchasing broker-dealer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 4 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 24, 25 -IssueDate 2006-05-01 -Chapter 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 24-31, 35 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Brokerage commissions payable10false 4mlwf_SponsorAndAdvisoryFeesPayablemlwf_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse30471483047148falsefalsefalse2truefalsefalse32087633208763falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the outstanding sponsorship fees payable based on the classes of units and fees paid to its trading advisor.No definition available.false2Sponsor and Advisory fees payable11false 4mlwf_RedemptionsPayablemlwf_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse50319455031945falsefalsefalse2truefalsefalse1040345510403455falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents redemption proceeds payable to the various classes of unit holders based on the maturity and redemption pattern.No definition available.false2Redemptions payable12false 4mlwf_NetUnrealizedLossOnOpenFuturesContractsmlwf_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse85071618507161falsefalsefalse2truefalsefalse34953133495313falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the net unrealized losses on open futures contracts which arise on an account of translation difference and the impact of market and credit risk.No definition available.false2Net unrealized loss on open futures contracts13false 4mlwf_NetUnrealizedLossOnOpenForwardsContractsmlwf_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse36821083682108falsefalsefalse2truefalsefalse16363001636300falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the net unrealized losses on open forwards contracts which arise on an account of translation difference and also the impact of market and credit risk.No definition available.false2Net unrealized loss on open forwards contracts14false 4us-gaap_OtherLiabilitiesus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse705081705081falsefalsefalse2truefalsefalse451936451936falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 false2Other liabilities15false 4us-gaap_Liabilitiesus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse2098074420980744falsefalsefalse2truefalsefalse1920174219201742falsefalsefalsexbrli:monetaryItemTypemonetarySum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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