2.4.0.84070 - Disclosure - Financial Highlights (Details)truefalsefalse1false falsefalseD2013Q2http://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli02false falsefalseD2012Q2http://www.sec.gov/CIK0000845698duration2012-04-01T00:00:002012-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli03false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0000845698duration2013-01-01T00:00:002013-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli04false falsefalseD2012Q2YTDhttp://www.sec.gov/CIK0000845698duration2012-01-01T00:00:002012-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli01true 4gpff_RatiosAsPercentageOfAverageNetAssetsAbstractgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Ratios as a percentage of average net assets:2false 5gpff_AnnualizedExpensesPriorToIncentiveFeesPercentOfNetAssetsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.06260.0626falsefalsefalse2truetruefalse0.06390.0639falsefalsefalse3truetruefalse0.06280.0628falsefalsefalse4truetruefalse0.06380.0638falsefalsefalsenum:percentItemTypepureRepresents annualized ratio of expenses prior to incentive fees to average net assets.No definition available.false0Expenses prior to incentive fees (as a percent)3false 5gpff_IncentiveFeesPercentOfNetAssetsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00000.0000falsefalsefalse2truetruefalse0.00580.0058falsefalsefalse3truetruefalse0.00060.0006falsefalsefalse4truetruefalse0.00810.0081falsefalsefalsenum:percentItemTypepureRepresents ratio of incentive fees to average net assets which is not annualized.No definition available.false0Incentive fees (as a percent)4false 5gpff_TotalExpensesPercentOfNetAssetsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truetruefalse0.06260.0626falsefalsefalse2truetruefalse0.06970.0697falsefalsefalse3truetruefalse0.06340.0634falsefalsefalse4truetruefalse0.07190.0719falsefalsefalsenum:percentItemTypepureRepresents ratio of total expenses to average net assets.No definition available.true0Total expenses (as a percent)5false 4gpff_InvestmentGainLossNetAnnualizedPercentOfNetAssetsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0606-0.0606falsefalsefalse2truetruefalse-0.0615-0.0615falsefalsefalse3truetruefalse-0.0607-0.0607falsefalsefalse4truetruefalse-0.0613-0.0613falsefalsefalsenum:percentItemTypepureRepresents annualized ratio of net income or loss on investments to average net assets, excluding incentive fees.No definition available.false0Net investment loss (as a percent)6false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5false USDtruefalse$D2013Q2_CapitalUnitClassAMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseClass A Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CapitalUnitClassAMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Class A Units7true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights8false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0491-0.0491falsefalsefalse2truetruefalse0.01000.0100falsefalsefalse3truetruefalse-0.0513-0.0513falsefalsefalse4truetruefalse-0.0044-0.0044falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)9true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):10false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse1213.591213.59USD$falsetruefalse2truefalsefalse1277.321277.32USD$falsetruefalse3truefalsefalse1216.371216.37USD$falsetruefalse4truefalsefalse1295.841295.84USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)11true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:12false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-40.68-40.68USD$falsetruefalse2truefalsefalse40.9640.96USD$falsetruefalse3truefalsefalse-23.72-23.72USD$falsetruefalse4truefalsefalse45.6445.64USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)13false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-18.92-18.92USD$falsetruefalse2truefalsefalse-28.14-28.14USD$falsetruefalse3truefalsefalse-38.66-38.66USD$falsetruefalse4truefalsefalse-51.34-51.34USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)14false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-59.60-59.60USD$falsetruefalse2truefalsefalse12.8212.82USD$falsetruefalse3truefalsefalse-62.38-62.38USD$falsetruefalse4truefalsefalse-5.70-5.70USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)15false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse1153.991153.99USD$falsetruefalse2truefalsefalse1290.141290.14USD$falsetruefalse3truefalsefalse1153.991153.99USD$falsetruefalse4truefalsefalse1290.141290.14USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)16false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse9false USDtruefalse$D2013Q2_CapitalUnitClassBMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseClass B Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CapitalUnitClassBMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Class B Units17true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights18false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0507-0.0507falsefalsefalse2truetruefalse0.00850.0085falsefalsefalse3truetruefalse-0.0543-0.0543falsefalsefalse4truetruefalse-0.0076-0.0076falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)19true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):20false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse1021.071021.07USD$falsetruefalse2truefalsefalse1081.521081.52USD$falsetruefalse3truefalsefalse1024.971024.97USD$falsetruefalse4truefalsefalse1099.041099.04USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)21true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:22false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-34.35-34.35USD$falsetruefalse2truefalsefalse34.6334.63USD$falsetruefalse3truefalsefalse-20.13-20.13USD$falsetruefalse4truefalsefalse38.6938.69USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)23false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-17.40-17.40USD$falsetruefalse2truefalsefalse-25.47-25.47USD$falsetruefalse3truefalsefalse-35.52-35.52USD$falsetruefalse4truefalsefalse-47.05-47.05USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)24false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-51.75-51.75USD$falsetruefalse2truefalsefalse9.169.16USD$falsetruefalse3truefalsefalse-55.65-55.65USD$falsetruefalse4truefalsefalse-8.36-8.36USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)25false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse969.32969.32USD$falsetruefalse2truefalsefalse1090.681090.68USD$falsetruefalse3truefalsefalse969.32969.32USD$falsetruefalse4truefalsefalse1090.681090.68USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)26false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse13false USDtruefalse$D2013Q2_LegacyOneClassMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseLegacy 1 Class Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigpff_LegacyOneClassMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Legacy 1 Class Units27true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights28false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0436-0.0436falsefalsefalse2truetruefalse0.01570.0157falsefalsefalse3truetruefalse-0.0405-0.0405falsefalsefalse4truetruefalse0.00690.0069falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)29true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):30false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse878.96878.96USD$falsetruefalse2truefalsefalse904.32904.32USD$falsetruefalse3truefalsefalse876.10876.10USD$falsetruefalse4truefalsefalse912.23912.23USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)31true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:32false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-29.88-29.88USD$falsetruefalse2truefalsefalse28.8328.83USD$falsetruefalse3truefalsefalse-17.78-17.78USD$falsetruefalse4truefalsefalse32.0532.05USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)33false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-8.45-8.45USD$falsetruefalse2truefalsefalse-14.60-14.60USD$falsetruefalse3truefalsefalse-17.69-17.69USD$falsetruefalse4truefalsefalse-25.73-25.73USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)34false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-38.33-38.33USD$falsetruefalse2truefalsefalse14.2314.23USD$falsetruefalse3truefalsefalse-35.47-35.47USD$falsetruefalse4truefalsefalse6.326.32USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)35false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse840.63840.63USD$falsetruefalse2truefalsefalse918.55918.55USD$falsetruefalse3truefalsefalse840.63840.63USD$falsetruefalse4truefalsefalse918.55918.55USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)36false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse17false USDtruefalse$D2013Q2_LegacyTwoClassMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseLegacy 2 Class Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigpff_LegacyTwoClassMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Legacy 2 Class Units37true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights38false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0442-0.0442falsefalsefalse2truetruefalse0.01440.0144falsefalsefalse3truetruefalse-0.0416-0.0416falsefalsefalse4truetruefalse0.00500.0050falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)39true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):40false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse866.97866.97USD$falsetruefalse2truefalsefalse894.70894.70USD$falsetruefalse3truefalsefalse864.60864.60USD$falsetruefalse4truefalsefalse903.06903.06USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)41true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:42false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-29.25-29.25USD$falsetruefalse2truefalsefalse28.6128.61USD$falsetruefalse3truefalsefalse-17.18-17.18USD$falsetruefalse4truefalsefalse31.8731.87USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)43false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-9.07-9.07USD$falsetruefalse2truefalsefalse-15.72-15.72USD$falsetruefalse3truefalsefalse-18.77-18.77USD$falsetruefalse4truefalsefalse-27.34-27.34USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)44false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-38.32-38.32USD$falsetruefalse2truefalsefalse12.8912.89USD$falsetruefalse3truefalsefalse-35.95-35.95USD$falsetruefalse4truefalsefalse4.534.53USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)45false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse828.65828.65USD$falsetruefalse2truefalsefalse907.59907.59USD$falsetruefalse3truefalsefalse828.65828.65USD$falsetruefalse4truefalsefalse907.59907.59USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)46false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse21false USDtruefalse$D2013Q2_GlobalOneClassMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseGlobal 1 Class Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigpff_GlobalOneClassMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Global 1 Class Units47true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights48false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0421-0.0421falsefalsefalse2truetruefalse0.01720.0172falsefalsefalse3truetruefalse-0.0375-0.0375falsefalsefalse4truetruefalse0.01070.0107falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)49true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):50false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse849.59849.59USD$falsetruefalse2truefalsefalse868.77868.77USD$falsetruefalse3truefalsefalse845.52845.52USD$falsetruefalse4truefalsefalse874.34874.34USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)51true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:52false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-28.73-28.73USD$falsetruefalse2truefalsefalse28.2528.25USD$falsetruefalse3truefalsefalse-16.96-16.96USD$falsetruefalse4truefalsefalse31.5731.57USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)53false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-7.01-7.01USD$falsetruefalse2truefalsefalse-13.30-13.30USD$falsetruefalse3truefalsefalse-14.71-14.71USD$falsetruefalse4truefalsefalse-22.19-22.19USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)54false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-35.74-35.74USD$falsetruefalse2truefalsefalse14.9514.95USD$falsetruefalse3truefalsefalse-31.67-31.67USD$falsetruefalse4truefalsefalse9.389.38USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)55false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse813.85813.85USD$falsetruefalse2truefalsefalse883.72883.72USD$falsetruefalse3truefalsefalse813.85813.85USD$falsetruefalse4truefalsefalse883.72883.72USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)56false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse25false USDtruefalse$D2013Q2_GlobalTwoClassMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseGlobal 2 Class Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigpff_GlobalTwoClassMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Global 2 Class Units57true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights58false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0426-0.0426falsefalsefalse2truetruefalse0.01650.0165falsefalsefalse3truetruefalse-0.0386-0.0386falsefalsefalse4truetruefalse0.00930.0093falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)59true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):60false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse838.99838.99USD$falsetruefalse2truefalsefalse860.14860.14USD$falsetruefalse3truefalsefalse835.49835.49USD$falsetruefalse4truefalsefalse866.22866.22USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)61true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:62false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-28.26-28.26USD$falsetruefalse2truefalsefalse27.5227.52USD$falsetruefalse3truefalsefalse-16.55-16.55USD$falsetruefalse4truefalsefalse30.9130.91USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)63false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-7.52-7.52USD$falsetruefalse2truefalsefalse-13.35-13.35USD$falsetruefalse3truefalsefalse-15.73-15.73USD$falsetruefalse4truefalsefalse-22.82-22.82USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)64false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-35.78-35.78USD$falsetruefalse2truefalsefalse14.1714.17USD$falsetruefalse3truefalsefalse-32.28-32.28USD$falsetruefalse4truefalsefalse8.098.09USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)65false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse803.21803.21USD$falsetruefalse2truefalsefalse874.31874.31USD$falsetruefalse3truefalsefalse803.21803.21USD$falsetruefalse4truefalsefalse874.31874.31USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)66false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse29false USDtruefalse$D2013Q2_GlobalThreeClassMemberhttp://www.sec.gov/CIK0000845698duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseGlobal 3 Class Unitsus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigpff_GlobalThreeClassMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Global 3 Class Units67true 3gpff_ScheduleOfFinancialHighlightsPartnershipActivityLineItemsgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Highlights68false 4gpff_TotalReturnOnInvestmentgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.0469-0.0469falsefalsefalse2truetruefalse0.01240.0124falsefalsefalse3truetruefalse-0.0470-0.0470falsefalsefalse4truetruefalse0.00090.0009falsefalsefalsenum:percentItemTypepureRepresents total return earned on theoretical investment by various classes of units during the period which is not annualized.No definition available.false0Total return (as a percent)69true 4gpff_NetAssetValuePerUnitRollForwardgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Per Unit Performance (for unit outstanding throughout the entire period):70false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse779.82779.82USD$falsetruefalse2truefalsefalse813.23813.23USD$falsetruefalse3truefalsefalse779.90779.90USD$falsetruefalse4truefalsefalse822.60822.60USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at beginning of period (in dollars per unit)71true 5us-gaap_IncomeLossFromOperationsBeforeExtraordinaryItemsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income (loss) from operations:72false 6gpff_NetRealizedAndChangesInUnrealizedIncomeLossFromTradingPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-26.15-26.15USD$falsetruefalse2truefalsefalse25.9625.96USD$falsetruefalse3truefalsefalse-15.23-15.23USD$falsetruefalse4truefalsefalse29.2629.26USD$falsetruefalsenum:perShareItemTypedecimalRepresents net realized and change in unrealized gain (loss) from trading operations, allocated to each outstanding limited partnership and general partnership unit. The net realized and change in unrealized gain from trading is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.No definition available.false3Net realized and change in unrealized gain (loss) from trading (in dollars per unit)73false 6gpff_ExpensesNetOfInterestAndDividendIncomePerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicgpff_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-10.40-10.40USD$falsetruefalse2truefalsefalse-15.85-15.85USD$falsetruefalse3truefalsefalse-21.40-21.40USD$falsetruefalse4truefalsefalse-28.52-28.52USD$falsetruefalsenum:perShareItemTypedecimalRepresents expenses net of interest and dividend income, allocated to each outstanding limited partnership and general partnership unit. Expenses net of interest and dividend income per unit and organization and offering costs per unit are calculated by dividing the expenses net of interest and dividend income and organization and offering costs by the average number of units outstanding during the period.No definition available.false3Expenses net of interest income (in dollars per unit)74false 6us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-36.55-36.55USD$falsetruefalse2truefalsefalse10.1110.11USD$falsetruefalse3truefalsefalse-36.63-36.63USD$falsetruefalse4truefalsefalse0.740.74USD$falsetruefalsenum:perShareItemTypedecimalNet income (loss) allocated to each outstanding limited partnership and general partnership unit.No definition available.true3Total income (loss) from operations (in dollars per unit)75false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse743.27743.27USD$falsetruefalse2truefalsefalse823.34823.34USD$falsetruefalse3truefalsefalse743.27743.27USD$falsetruefalse4truefalsefalse823.34823.34USD$falsetruefalsenum:perShareItemTypedecimalThis amount provides for net asset value per unit. Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.false3Net asset value per unit at end of period (in dollars per unit)falseFinancial Highlights (Details) (USD $)UnKnownUnKnownNoRoundingUnKnowntruefalsefalseSheethttp://www.grantparkfunds.com/role/DisclosureFinancialHighlightsDetails475