2.4.0.8134 - Disclosure - Significant Accounting Policies (Details 2)truefalsefalse1false USDfalsefalse$P01_01_2013To06_30_2013http://www.sec.gov/CIK0001287701duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 4us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldus-gaap_truedebitinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse00USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 false2Balance as of December 31, 2012 of credit losses on Retained CDO Bonds for which a portion of an OTTI was recognized in other comprehensive income2true 4gkk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAbstractgkk_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Additions to credit losses:3false 5us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairmentus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse16821682falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 false2On Retained CDO Bonds for which an OTTI was not previously recognized4false 5gkk_Otherthantemporaryimpairmentcreditlossesrecognizedinearningspreviouslyimpairmentgkk_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresenting value for other than temporary impairment credit losses recognized in earnings previously impairment.No definition available.false2On Retained CDO Bonds for which an OTTI was previously recognized and a portion of an other-than-temporary impairment was recognized in other comprehensive income5false 5gkk_Otherthantemporaryimpairmentcreditlossesrecognizedinearningspreviouslyimpairmentwithoutanyportiongkk_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresenting value for other than temporary impairment credit losses recognized in earnings previously impairment without any portion.No definition available.false2On Retained CDO Bonds for which an OTTI was previously recognized without any portion of other-than-temporary impairment recognized in other comprehensive income6true 4gkk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsAbstractgkk_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Reduction for credit losses:7false 5gkk_Otherthantemporaryimpairmentcreditlossesrecognizedcomprehensiveincomeatcurrentmeasurementdategkk_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresenting other than temporary impairment credit losses recognized comprehensive income at current measurement date.No definition available.false2On Retained CDO Bonds for which no other-than-temporary impairment was recognized in other comprehensive income at current measurement date8false 5us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 false2On Retained CDO Bonds sold during the period9false 5gkk_Otherthantemporaryimpairmentcreditlossesrecognizedinearningsreductionchargedoffgkk_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresenting other than temporary impairment credit losses recognized in earnings reduction charged off.No definition available.false2On Retained CDO Bonds charged off during the period10false 5us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlowsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 false2For increases in cash flows expected to be collected that are recognized over the remaining life of theRetained CDO Bonds11false 4us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse16821682USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 false2Balance as of June 30, 2013 of credit losses on Retained CDO Bonds for which a portion of an OTTI was recognized in other comprehensive incomefalseSignificant Accounting Policies (Details 2) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.gramercycapitalcorp.com/role/SignificantAccountingPoliciesDetails2111