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4gkk_ProceedsFromSaleOfRepurchasedNotesgkk_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse3438100034381000USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash inflow associated with the sale of repurchased notes.No definition available.false2Proceeds From Sale Of Repurchased Notes2false 4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse389140000389140000USD$falsefalsefalse2truefalsefalse00USD$falsefalsefalse3truefalsefalse5300053000USD$falsefalsefalse4truefalsefalse389140000389140000USD$falsefalsefalse5truefalsefalse1199600011996000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 false2Net gains from disposals3false 4gkk_ReceivablesFromServicingAdvancegkk_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1460400014604000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse1460400014604000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount to be collected from customers in accordance with servicing advances receivable as of the balance sheet date.No definition available.false2Servicing advances receivable4false 4gkk_CollateralizedDebtObligationsBondsgkk_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse76450007645000USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse76450007645000USD$falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the carrying value of the collateralized debt obligation bonds as of the balance sheet date.No definition available.false2Retained CDO bonds5false 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acquisition cost of acquired purchase price12false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7false truefalseP04_01_2013To06_30_2013_ElevenPropertiesMemberusgaapRealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxishttp://www.sec.gov/CIK0001287701duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseEleven Properties [Member]us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxisxbrldihttp://xbrl.org/2006/xbrldigkk_ElevenPropertiesMemberus-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0sqftStandardhttp://www.xbrl.org/2009/utrsqftutr0nanafalse0Eleven Properties [Member]13false 4gkk_NumberOfPropertiesAcquiredgkk_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2truefalsefalse1111falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe number of properties acquired by the entity during the period.No definition available.false0Number of Properties acquired14false 4us-gaap_AreaOfLandus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2truefalsefalse650000650000falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse650000650000falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsenum:areaItemTypedecimalArea of land held.No definition available.false256Area Of Land15false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse8false USDtruefalse$PAsOn06_30_2013_CommercialLeasePropertiesMemberusgaapRealEstatePropertiesAxishttp://www.sec.gov/CIK0001287701instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseCommercial Lease Properties [Member]us-gaap_RealEstatePropertiesAxisxbrldihttp://xbrl.org/2006/xbrldigkk_CommercialLeasePropertiesMemberus-gaap_RealEstatePropertiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Commercial Lease Properties [Member]16false 4gkk_AvailableForSaleSecuritiesAndOtherInvestmentsgkk_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2truefalsefalse15000001500000USD$falsetruefalse3falsefalsefalse00falsefalsefalse4truefalsefalse15000001500000USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of available for sale securities and other investments as of the reporting date.No definition available.false2Available For Sale Securities and Other InvestmentsfalseBusiness and Organization (Details Textual) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.gramercycapitalcorp.com/role/BusinessAndOrganizationDetailsTextual616