2.4.0.8 HtmlAndXml 426 139 1 true 60 0 false 9 false false R1.htm 0000 - Document - Document and Entity Information Sheet http://www.grantparkfunds.com/role/DocumentAndEntityInformation Document and Entity Information R1.xml false false R2.htm 0010 - Statement - Consolidated Statements of Financial Condition Sheet http://www.grantparkfunds.com/role/BalanceSheet Consolidated Statements of Financial Condition R2.xml false false R3.htm 0015 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.grantparkfunds.com/role/BalanceSheetParenthetical Consolidated Statements of Financial Condition (Parenthetical) R3.xml false false R4.htm 0020 - Statement - Consolidated Condensed Schedule of Investments Sheet http://www.grantparkfunds.com/role/ScheduleOfInvestments Consolidated Condensed Schedule of Investments R4.xml false false R5.htm 0030 - Statement - Consolidated Statements of Operations Sheet http://www.grantparkfunds.com/role/StatementOfIncome Consolidated Statements of Operations R5.xml false false R6.htm 0040 - Statement - Consolidated Statements of Changes in Partners' Capital (Net Asset Value) (Class A, Class B and Legacy Class) Sheet http://www.grantparkfunds.com/role/StatementsOfChangesInPartnersCapitalClassAClassBAndLegacyClass Consolidated Statements of Changes in Partners' Capital (Net Asset Value) (Class A, Class B and Legacy Class) R6.xml false false R7.htm 0041 - Statement - Consolidated Statements of Changes in Partners' Capital (Net Asset Value) (Global Class) Sheet http://www.grantparkfunds.com/role/StatementsOfChangesInPartnersCapitalGlobalClass Consolidated Statements of Changes in Partners' Capital (Net Asset Value) (Global Class) R7.xml false false R8.htm 1010 - Disclosure - Nature of Business and Significant Accounting Policies Sheet http://www.grantparkfunds.com/role/DisclosureNatureOfBusinessAndSignificantAccountingPolicies Nature of Business and Significant Accounting Policies R8.xml false false R9.htm 1020 - Disclosure - Fair Value Measurements Sheet http://www.grantparkfunds.com/role/DisclosureFairValueMeasurements Fair Value Measurements R9.xml false false R10.htm 1030 - Disclosure - Deposits with Brokers Sheet http://www.grantparkfunds.com/role/DisclosureDepositsWithBrokers Deposits with Brokers R10.xml false false R11.htm 1040 - Disclosure - Commodity Trading Advisors Sheet http://www.grantparkfunds.com/role/DisclosureCommodityTradingAdvisors Commodity Trading Advisors R11.xml false false R12.htm 1050 - Disclosure - General Partner and Related Party Transactions Sheet http://www.grantparkfunds.com/role/DisclosureGeneralPartnerAndRelatedPartyTransactions General Partner and Related Party Transactions R12.xml false false R13.htm 1060 - Disclosure - Subscriptions, Redemptions and Allocation of Net Income or Loss Sheet http://www.grantparkfunds.com/role/DisclosureSubscriptionsRedemptionsAndAllocationOfNetIncomeOrLoss Subscriptions, Redemptions and Allocation of Net Income or Loss R13.xml false false R14.htm 1070 - Disclosure - Financial Highlights Sheet http://www.grantparkfunds.com/role/DisclosureFinancialHighlights Financial Highlights R14.xml false false R15.htm 1080 - Disclosure - Trading Activities and Related Risks Sheet http://www.grantparkfunds.com/role/DisclosureTradingActivitiesAndRelatedRisks Trading Activities and Related Risks R15.xml false false R16.htm 1090 - Disclosure - Indemnifications Sheet http://www.grantparkfunds.com/role/DisclosureIndemnifications Indemnifications R16.xml false false R17.htm 1100 - Disclosure - Derivative Instruments Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstruments Derivative Instruments R17.xml false false R18.htm 1110 - Disclosure - Subsequent Events Sheet http://www.grantparkfunds.com/role/DisclosureSubsequentEvents Subsequent Events R18.xml false false R19.htm 2010 - Disclosure - Nature of Business and Significant Accounting Policies (Policies) Sheet http://www.grantparkfunds.com/role/DisclosureNatureOfBusinessAndSignificantAccountingPoliciesPolicies Nature of Business and Significant Accounting Policies (Policies) R19.xml false false R20.htm 3020 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.grantparkfunds.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) R20.xml false false R21.htm 3050 - Disclosure - General Partner and Related Party Transactions (Tables) Sheet http://www.grantparkfunds.com/role/DisclosureGeneralPartnerAndRelatedPartyTransactionsTables General Partner and Related Party Transactions (Tables) R21.xml false false R22.htm 3070 - Disclosure - Financial Highlights (Tables) Sheet http://www.grantparkfunds.com/role/DisclosureFinancialHighlightsTables Financial Highlights (Tables) R22.xml false false R23.htm 3100 - Disclosure - Derivative Instruments (Tables) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsTables Derivative Instruments (Tables) R23.xml false false R24.htm 4010 - Disclosure - Nature of Business and Significant Accounting Policies (Details) Sheet http://www.grantparkfunds.com/role/DisclosureNatureOfBusinessAndSignificantAccountingPoliciesDetails Nature of Business and Significant Accounting Policies (Details) R24.xml false false R25.htm 4020 - Disclosure - Fair Value Measurements (Details) Sheet http://www.grantparkfunds.com/role/DisclosureFairValueMeasurementsDetails Fair Value Measurements (Details) R25.xml false false R26.htm 4040 - Disclosure - Commodity Trading Advisors (Details) Sheet http://www.grantparkfunds.com/role/DisclosureCommodityTradingAdvisorsDetails Commodity Trading Advisors (Details) R26.xml false false R27.htm 4050 - Disclosure - General Partner and Related Party Transactions (Details) Sheet http://www.grantparkfunds.com/role/DisclosureGeneralPartnerAndRelatedPartyTransactionsDetails General Partner and Related Party Transactions (Details) R27.xml false false R28.htm 4060 - Disclosure - Subscriptions, Redemptions and Allocation of Net Income or Loss (Details) Sheet http://www.grantparkfunds.com/role/DisclosureSubscriptionsRedemptionsAndAllocationOfNetIncomeOrLossDetails Subscriptions, Redemptions and Allocation of Net Income or Loss (Details) R28.xml false false R29.htm 4070 - Disclosure - Financial Highlights (Details) Sheet http://www.grantparkfunds.com/role/DisclosureFinancialHighlightsDetails Financial Highlights (Details) R29.xml false false R30.htm 4080 - Disclosure - Trading Activities and Related Risks (Details) Sheet http://www.grantparkfunds.com/role/DisclosureTradingActivitiesAndRelatedRisksDetails Trading Activities and Related Risks (Details) R30.xml false false R31.htm 4100 - Disclosure - Derivative Instruments (Details) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsDetails Derivative Instruments (Details) R31.xml false false R32.htm 4101 - Disclosure - Derivative Instruments (Details 2) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsDetails2 Derivative Instruments (Details 2) R32.xml false false R33.htm 4102 - Disclosure - Derivative Instruments (Details 3) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsDetails3 Derivative Instruments (Details 3) R33.xml false false R34.htm 4103 - Disclosure - Derivative Instruments (Details 4) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsDetails4 Derivative Instruments (Details 4) R34.xml false false R35.htm 4104 - Disclosure - Derivative Instruments (Details 5) Sheet http://www.grantparkfunds.com/role/DisclosureDerivativeInstrumentsDetails5 Derivative Instruments (Details 5) R35.xml false false R36.htm 4110 - Disclosure - Subsequent Events (Details) Sheet http://www.grantparkfunds.com/role/DisclosureSubsequentEventsDetails Subsequent Events (Details) R36.xml true false All Reports Book All Reports Process Flow-Through: 0010 - Statement - Consolidated Statements of Financial Condition Process Flow-Through: Removing column 'Jun. 30, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 0015 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Process Flow-Through: 0020 - Statement - Consolidated Condensed Schedule of Investments Process Flow-Through: 0030 - Statement - Consolidated Statements of Operations gpff-20130630.xml gpff-20130630.xsd gpff-20130630_cal.xml gpff-20130630_def.xml gpff-20130630_lab.xml gpff-20130630_pre.xml true true