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5us-gaap_BusinessAcquisitionPurchasePriceAllocationBuildingsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse106688000106688000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse106688000106688000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse269616000269616000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of acquisition cost of a business combination allocated to buildings included in real estate.No definition available.false2Buildings7false 5stag_BusinessAcquisitionPurchasePriceAllocationTenantImprovementsstag_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse13000001300000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse13000001300000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse1062400010624000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of 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5stag_BusinessAcquisitionPurchasePriceAllocationBuildingAndLandImprovementsstag_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse38970003897000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse38970003897000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse74880007488000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of acquisition cost of a business combination allocated to building and land improvements included in real estate.No definition available.false2Building and land Improvements10false 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Net assets acquired11false 4stag_NumberOfBuildingsAcquiredThroughIssuanceOfCommonStockstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse88falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of buildings purchased through issuance of common stock.No definition available.false256Number of buildings purchased through issuance of common stock12false 4stag_EquityInterestsIssuedOrIssuableNumberOfSharesOfOperatingPartnershipIssuedstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse555758555758falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesRepresents the number of common units of operating partnership issued as a consideration for payment of acquisition fees to the entity.No definition available.false1Number of common units issued as a consideration for purchase of building13false 4stag_EquityInterestsIssuedOrIssuableFairValueOfSharesOfOperatingPartnershipIssuedstag_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1150000011500000USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the fair value of common units of operating partnership issued to the entity.No definition available.false2Fair value of common units issued14false 4us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaidus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4010000040100000USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of cash paid to acquire the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Purchase price paid in cash15false 4us-gaap_BusinessCombinationAcquisitionRelatedCostsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse12690001269000USD$falsefalsefalse3truefalsefalse11490001149000USD$falsefalsefalse4truefalsefalse18450001845000USD$falsefalsefalse5truefalsefalse14410001441000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Building acquisition costs16true 2us-gaap_BusinessAcquisitionProFormaInformationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Pro forma information17false 3us-gaap_BusinessAcquisitionsProFormaRevenueus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse6849300068493000USD$falsefalsefalse5truefalsefalse4974500049745000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 false2Total revenue18false 3us-gaap_BusinessAcquisitionsProFormaNetIncomeLossus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse33600003360000USD$falsefalsefalse5truefalsefalse11280001128000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 false2Net income19false 3stag_BusinessAcquisitionsProFormaNetIncomeLossAttributableToParentstag_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse-750000-750000USD$falsefalsefalse5truefalsefalse-1407000-1407000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the pro forma net income (loss) from continuing operations attributable to the parent for the period as if the business combination or combinations had been completed at the beginning of the period.No definition available.false2Net loss attributable to common stockholders20false 3stag_BusinessAcquisitionsProFormaWeightedAverageSharesOutstandingstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse4126507041265070falsefalsefalse5truefalsefalse1765470617654706falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesRepresents the pro forma average number of shares or units issued and outstanding for the period as if the business combination or combinations had been completed at the beginning of the period.No definition available.false1Weighted average shares outstanding21false 3us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasicus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse-0.02-0.02USD$falsetruefalse5truefalsefalse-0.08-0.08USD$falsetruefalse6falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalThe pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -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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IAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_MarionIAMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Marion, IA47true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions48false 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MIstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_SouthfieldMIMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Southfield, MI55true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions56false 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IDstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_IdahoFallsIDMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Idaho Falls, ID63true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions64false 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Prospect, ILstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_MtProspectILMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Mt. Prospect, IL67true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions68false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2truefalsefalse8738087380falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse8738087380falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)69false 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PAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_WilliamsportPAMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Williamsport, PA71true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions72false 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MIstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_KentwoodMIMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Kentwood, MI79true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions80false 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CTstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_EwinsrMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0East Windsor, CT87true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions88false 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VAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_BuenavMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Buena Vista, VA187true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions188false 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MIstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_AubhilMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Auburn Hills, MI195true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions196false 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NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Glove1Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Gloversville 1, NY203true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions204false 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NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Glove3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Gloversville 3, NY211true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions212false 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0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse55false truefalseD2012_Glove4Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseGloversville 4, NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Glove4Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Gloversville 4, NY215true 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4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired218false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse56false truefalseD2012_Green1Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseGreenwood 1, SCstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Green1Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Greenwood 1, SC219true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions220false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse104955104955falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)221false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired222false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse57false truefalseD2012_Green2Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseGreenwood 2, SCstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Green2Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Greenwood 2, SC223true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions224false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse7010070100falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)225false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired226false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse58false truefalseD2012_Holla3Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseHolland 3, MIstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Holla3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Holland 3, MI227true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions228false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse195000195000falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)229false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired230false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse59false truefalseD2012_IndepeMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseIndependence, VAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_IndepeMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Independence, VA231true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions232false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse120000120000falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)233false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired234false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse60false truefalseD2012_Jacks3Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseJackson, TNstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Jacks3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Jackson, TN235true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions236false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse250000250000falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)237false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired238false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse61false truefalseD2012_Johns1Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseJohnstown 1, NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Johns1Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Johnstown 1, NY239true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions240false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse5250052500falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)241false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired242false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse62false truefalseD2012_Johns2Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseJohnstown 2, NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Johns2Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Johnstown 2, NY243true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions244false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse6000060000falsefalsefalsenum:areaItemTypedecimalArea 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NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Johns3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Johnstown 3, NY247true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions248false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse4232542325falsefalsefalsenum:areaItemTypedecimalArea 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NYstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Johns4Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Johnstown 4, NY251true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions252false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse5710257102falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)253false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired254false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse65false truefalseD2012_KansasMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseKansas City, KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_KansasMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Kansas City, KS255true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions256false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse5658056580falsefalsefalsenum:areaItemTypedecimalArea 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INstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Lafay1Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Lafayette 1, IN259true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions260false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse7140071400falsefalsefalsenum:areaItemTypedecimalArea 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INstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Lafay2Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Lafayette 2, IN263true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions264false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse120000120000falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)265false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired266false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse68false truefalseD2012_Lafay3Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseLafayette 3, INstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Lafay3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Lafayette 3, IN267true 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MIstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Lansn3Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Lansing 3, MI271true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions272false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse250100250100falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)273false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired274false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse70false truefalseD2012_MarionMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseMarion, OHstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_MarionMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Marion, OH275true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions276false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse249600249600falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)277false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired278false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse71false truefalseD2012_NoviMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseNovi, 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real estate property.No definition available.false256Area (in square feet)281false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired282false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse72false truefalseD2012_OharaMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseO'Hara, PAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_OharaMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0O'Hara, PA283true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions284false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse887084887084falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)285false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired286false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse73false truefalseD2012_ParsonMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseParsons, KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_ParsonMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Parsons, KS287true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions288false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse120000120000falsefalsefalsenum:areaItemTypedecimalArea 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ALstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_PhenixMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Phenix City, AL291true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions292false 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0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse75false truefalseD2012_PortagMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalsePortage, INstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_PortagMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Portage, IN295true 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4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired298false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse76false truefalseD2012_WareshMemberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseWare Shoals, SCstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_WareshMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Ware Shoals, SC299true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions300false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse2051420514falsefalsefalsenum:areaItemTypedecimalArea of a real estate property.No definition available.false256Area (in square feet)301false 4stag_NumberOfPropertiesAcquiredstag_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties acquired by the entity.No definition available.false256Number of buildings acquired302false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse77false truefalseD2012_Wich01Memberhttp://www.sec.gov/CIK0001479094duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseWichita 1, KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Wich01Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Wichita 1, KS303true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions304false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse8085080850falsefalsefalsenum:areaItemTypedecimalArea 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KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Wich02Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Wichita 2, KS307true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions308false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse120000120000falsefalsefalsenum:areaItemTypedecimalArea 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KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Wich03Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Wichita 3, KS311true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions312false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse4476044760falsefalsefalsenum:areaItemTypedecimalArea 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KSstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_Wich04Memberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Wichita 4, KS315true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions316false 4us-gaap_AreaOfRealEstatePropertyus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse4770047700falsefalsefalsenum:areaItemTypedecimalArea 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MAstag_RealEstatePropertiesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldistag_ChicopeeMAMemberstag_RealEstatePropertiesByTypeAxisexplicitMemberPropertyStandardhttp://www.stagindustrial.com/20130630propertystag0Square_FootStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Chicopee, MA319true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Formation transactions320false 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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. false2Amortizable intangible assets365false 4us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse005 years 8 months 12 daysfalsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse006 years 7 months 6 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 false0Weighted Average Amortization Period of Lease Intangibles (in years)366false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse96false USDtruefalseD2013Q2YTD_CustomerRelationshipsMemberhttp://www.sec.gov/CIK0001479094duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseTenant relationshipsus-gaap_FiniteLivedIntangibleAssetsByMajorClassAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CustomerRelationshipsMemberus-gaap_FiniteLivedIntangibleAssetsByMajorClassAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0Tenant relationships367true 4us-gaap_BusinessAcquisitionPurchasePriceAllocationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Allocation of the consideration paid for the acquired assets and liabilities368false 5us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssetsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1023900010239000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse1023900010239000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse2624100026241000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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. false2Amortizable intangible assets369false 4us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse008 years 3 months 18 daysfalsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse008 years 2 months 12 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 false0Weighted Average Amortization Period of Lease Intangibles (in years)370false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse98false USDtruefalse$D2013Q2_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMemberhttp://www.sec.gov/CIK0001479094duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseSeries of individually insignificant propertiesus-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMemberus-gaap_BusinessAcquisitionAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PropertyStandardhttp://www.stagindustrial.com/20130630propertystag0USDUSD$nanafalse0Series of individually insignificant properties371true 4us-gaap_BusinessAcquisitionPurchasePriceAllocationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Allocation of the consideration paid for the acquired assets and liabilities372false 4stag_NumberOfPropertiesAcquiredWhoseResultsAreIncludedInConsolidatedStatementOfOperationsstag_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse2323falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse2323falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of buildings acquired whose results of operations are included in the consolidated statement of operations.No definition available.false256Number of buildings acquired whose results of operations are included in the consolidated statement of operations373false 4us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActualus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse30000003000000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse34000003400000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Total revenue374false 4us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse600000600000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse12000001200000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Net loss375false 4us-gaap_BusinessCombinationAcquisitionRelatedCostsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse12000001200000USD$falsetruefalse3falsefalsefalse00falsefalsefalse4truefalsefalse17000001700000USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -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. false2Building acquisition costsfalseReal Estate (Details) (USD $)NoRoundingNoRoundingNoRoundingUnKnowntruefalsefalseSheethttp://www.stagindustrial.com/role/DisclosureRealEstateDetails6375