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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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. falseinstant2011-12-31T00:00:000001-01-01T00:00:001Partners' capital, (net asset value) (in units) at Dec. 31, 20116falseRowperiodPeriod*RowprimaryElement*8false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabelnum:perShareItemTypedecimalThis amount provides for net asset value per unit. 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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. falseinstant2012-12-31T00:00:000001-01-01T00:00:002Partners' capital, (net asset value) at Dec. 31, 201220falseRowperiodPeriod*RowprimaryElement*7false 5us-gaap_PartnersCapitalus-gaap_truecreditinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabelxbrli:monetaryItemTypemonetaryThe amount of ownership interest of different classes of partners in limited partnership.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 false2Partners' capital, (net asset value)duration2013-01-01T00:00:002013-06-30T00:00:00 0us-gaap_PartnersCapitalus-gaap_truecreditinstantfalsefalsetruefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse636740050636740050falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of ownership interest of different classes of partners in limited partnership.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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 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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 falseinstant2012-12-31T00:00:000001-01-01T00:00:002Partners' capital, (net asset value) at Dec. 31, 201221falseRowperiodPeriod*RowprimaryElement*3false 5us-gaap_GeneralPartnersCapitalAccountus-gaap_truecreditinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabelxbrli:monetaryItemTypemonetaryThe amount of the general partner's ownership interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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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. falseinstant2013-06-30T00:00:000001-01-01T00:00:002Partners' capital, (net asset value) at Jun. 30, 201334falseRowperiodPeriod*RowprimaryElement*17false 5us-gaap_LimitedPartnersCapitalAccountUnitsOutstandingus-gaap_truenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabelxbrli:sharesItemTypesharesThe number of limited partner units outstanding.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -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. false1Partners' capital, (net asset value) (in units)duration2013-01-01T00:00:002013-06-30T00:00:00 0us-gaap_LimitedPartnersCapitalAccountUnitsOutstandingus-gaap_truenainstantfalsefalsetruefalsefalsefalsetruefalseperiodEndLabel1falsefalsefalse00falsefalsefalse2truefalsefalse12271.5912271.59falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse12271.5912271.59falsefalsefalse5truefalsefalse25230.4425230.44falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse25230.4425230.44falsefalsefalse8truefalsefalse265877.08265877.08falsefalsefalse9falsefalsefalse00falsefalsefalse10truefalsefalse265877.08265877.08falsefalsefalsexbrli:sharesItemTypesharesThe number of limited partner units outstanding.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -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. falseinstant2013-06-30T00:00:000001-01-01T00:00:001Partners' capital, (net asset value) (in units) at Jun. 30, 201335falseRowperiodPeriod*RowprimaryElement*15false 5us-gaap_GeneralPartnersCapitalAccountUnitsOutstandingus-gaap_truenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabelxbrli:sharesItemTypesharesThe number of general partner units outstanding.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -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. false1Partners' capital, (net asset value) (in units)duration2013-01-01T00:00:002013-06-30T00:00:00 0us-gaap_GeneralPartnersCapitalAccountUnitsOutstandingus-gaap_truenainstantfalsefalsetruefalsefalsefalsetruefalseperiodEndLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1372.891372.89falsefalsefalse3truefalsefalse1372.891372.89falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse1974.701974.70falsefalsefalse6truefalsefalse1974.701974.70falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesThe number of general partner units outstanding.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -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. falseinstant2013-06-30T00:00:000001-01-01T00:00:001Partners' capital, (net asset value) (in units) at Jun. 30, 201336falseRowperiodPeriod*RowprimaryElement*19false 5gpff_NetAssetValuePerUnitgpff_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabelnum:perShareItemTypedecimalThis amount provides for net asset value per unit. 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Net asset value per unit is computed by dividing net asset value by units outstanding.No definition available.falseinstant2013-06-30T00:00:000001-01-01T00:00:003Net asset value per unit at end of period (in dollars per unit) at Jun. 30, 2013trueConsolidated Statements of Changes in Partners' Capital (Net Asset Value) (Global Class) (USD $)NoRoundingNoRoundingNoRoundingUnKnowntruefalsefalseSheethttp://www.grantparkfunds.com/role/StatementsOfChangesInPartnersCapitalGlobalClass1036