2.4.0.8140 - Disclosure - Dispositions and Assets Held-for-Sale (Details Textual)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$P03_01_2013To03_15_2013http://www.sec.gov/CIK0001287701duration2013-03-01T00:00:002013-03-15T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$P04_01_2013To06_30_2013http://www.sec.gov/CIK0001287701duration2013-04-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$P04_01_2012To06_30_2012http://www.sec.gov/CIK0001287701duration2012-04-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$P01_01_2013To06_30_2013http://www.sec.gov/CIK0001287701duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDfalsefalse$P01_01_2012To06_30_2012http://www.sec.gov/CIK0001287701duration2012-01-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse389140000389140USD$falsetruefalse2truefalsefalse00USD$falsetruefalse3truefalsefalse5300053USD$falsetruefalse4truefalsefalse389140000389140USD$falsetruefalse5truefalsefalse1199600011996USD$falsetruefalsexbrli: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 disposals2false 4gkk_DisposalGroupCashProceedsOnDisposalAfterExpensesgkk_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse62910006291falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of cash proceeds attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.No definition available.false2Collateral Debt Obligations3false 4us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse84920008492falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 false2Company carrying value-assets4false 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-Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653 false2Reimbursement Revenue6false 4gkk_ChangesInAssetsAndLiabilitiesCarryingValuegkk_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-421911000-421911USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryIt represent carrying value of asset and liabilities.No definition available.false2Changes in assets and liabilities carrying valuefalseDispositions and Assets Held-for-Sale (Details Textual) (USD 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