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Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
GAAP net income	$ 52,781us-gaap_NetIncomeLoss	$ 194,708us-gaap_NetIncomeLoss	$ 89,512us-gaap_NetIncomeLoss	$ 87,000us-gaap_NetIncomeLoss	$ 61,609us-gaap_NetIncomeLoss	$ 55,763us-gaap_NetIncomeLoss	$ 51,139us-gaap_NetIncomeLoss	$ 67,770us-gaap_NetIncomeLoss	$ 424,001us-gaap_NetIncomeLoss		$ 236,281us-gaap_NetIncomeLoss		$ 266,073us-gaap_NetIncomeLoss
Net book depreciation in excess of tax depreciation									39,620us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciation		32,906us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciation		37,492us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciation
Capitalized leasing/legal commissions									(13,576)kim_EffectiveIncomeTaxRateReconciliationCapitalizedLeasinglegalCommissions				(12,986)kim_EffectiveIncomeTaxRateReconciliationCapitalizedLeasinglegalCommissions
Deferred/prepaid/above and below market rents, net									(20,487)us-gaap_IncomeTaxReconciliationDeductionsOther		(11,985)us-gaap_IncomeTaxReconciliationDeductionsOther		(16,050)us-gaap_IncomeTaxReconciliationDeductionsOther
Fair market value debt amortization									(7,419)kim_EffectiveIncomeTaxRateReconciliationDeductionFairMarketValueDebtAmortization		(3,510)kim_EffectiveIncomeTaxRateReconciliationDeductionFairMarketValueDebtAmortization		(2,977)kim_EffectiveIncomeTaxRateReconciliationDeductionFairMarketValueDebtAmortization
Accounts receivable reserve									(681)kim_EffectiveIncomeTaxRateReconciliationDeductionAccountsReceivableReserve		(3,047)kim_EffectiveIncomeTaxRateReconciliationDeductionAccountsReceivableReserve		(741)kim_EffectiveIncomeTaxRateReconciliationDeductionAccountsReceivableReserve
Book/tax differences from investments in real estate joint ventures									33,268us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary		(11,928)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary		60,441us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Book/tax difference on sale of property									(152,613)us-gaap_IncomeTaxReconciliationDispositionOfAssets		36,896us-gaap_IncomeTaxReconciliationDispositionOfAssets		(77,853)us-gaap_IncomeTaxReconciliationDispositionOfAssets
Foreign income tax from Mexico capital gains									(17,387)us-gaap_IncomeTaxReconciliationTaxCreditsForeign		(31,130)us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Cumulative foreign currency translation adjustment & deferred tax adjustment									145,608us-gaap_IncomeTaxReconciliationOtherReconcilingItems		5,095us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Book adjustment to property carrying values and marketable equity securities									93,956us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses		22,811us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses		2,656us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Taxable currency exchange (loss)/gain, net									(73,138)us-gaap_IncomeTaxReconciliationTaxExemptIncome		(25,958)us-gaap_IncomeTaxReconciliationTaxExemptIncome		(2,620)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Book/tax differences on capitalized costs									5,498us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther		4,607us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther		5,781us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Repair regulation deduction									(95,033)kim_EffectiveIncomeTaxRateReconciliationDeductionsRepairRegulationDeduction
Dividends from taxable REIT subsidiaries									66,745us-gaap_IncomeTaxReconciliationDeductionsDividends		2,980us-gaap_IncomeTaxReconciliationDeductionsDividends		2,304us-gaap_IncomeTaxReconciliationDeductionsDividends
GAAP change in control gain									(107,235)kim_EffectiveIncomeTaxRateReconciliationGAAPChangeInControlGain		9,147kim_EffectiveIncomeTaxRateReconciliationGAAPChangeInControlGain		(15,555)kim_EffectiveIncomeTaxRateReconciliationGAAPChangeInControlGain
Other book/tax differences, net											229us-gaap_IncomeTaxReconciliationOtherAdjustments		(25)us-gaap_IncomeTaxReconciliationOtherAdjustments
Adjusted REIT taxable income									300,743kim_TaxableIncome		249,891kim_TaxableIncome		242,792kim_TaxableIncome
Other Credit Derivatives [Member]
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
Other book/tax differences, net									(1,052)us-gaap_IncomeTaxReconciliationOtherAdjustments / kim_DisclosureAxis = us-gaap_OtherCreditDerivativesMember		(4,822)us-gaap_IncomeTaxReconciliationOtherAdjustments / kim_DisclosureAxis = us-gaap_OtherCreditDerivativesMember		502us-gaap_IncomeTaxReconciliationOtherAdjustments / kim_DisclosureAxis = us-gaap_OtherCreditDerivativesMember
Restricted Stock [Member]
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
Sharebased Compensation									(1,078)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember		(2,247)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember		(200)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Employee Stock Option [Member]
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
Sharebased Compensation									(5,144)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember		(255)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember		1,774us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
GAAP net loss/(income) of taxable REIT subsidiaries [Member]
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
Less: GAAP net income of taxable REIT subsidiaries									(13,110)us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = kim_GAAPNetLossIncomeOfTaxableREITSubsidiariesMember		(5,950)us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = kim_GAAPNetLossIncomeOfTaxableREITSubsidiariesMember		(5,249)us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = kim_GAAPNetLossIncomeOfTaxableREITSubsidiariesMember
GAAP net income from REIT operations [Member]
Note 21 - Income Taxes (Details) - GAAP Net Income/(Loss) to Taxable Income Reconciliation [Line Items]
GAAP net income									$ 410,891us-gaap_NetIncomeLoss / dei_LegalEntityAxis = kim_GAAPNetIncomeFromREITOperationsMember	[1]	$ 230,331us-gaap_NetIncomeLoss / dei_LegalEntityAxis = kim_GAAPNetIncomeFromREITOperationsMember	[1]	$ 260,824us-gaap_NetIncomeLoss / dei_LegalEntityAxis = kim_GAAPNetIncomeFromREITOperationsMember	[1]
[1] All adjustments to "GAAP net income from REIT operations" are net of amounts attributable to noncontrolling interest and taxable REIT subsidiaries.

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