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Note 13 - Mortgages Payable (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Aug. 31, 2010
Dec. 31, 2013
Dec. 31, 2014
Note 13 - Mortgages Payable (Details) [Line Items]      
Repayments of Secured Debt $ 150.0us-gaap_RepaymentsOfSecuredDebt    
Acquisitions [Member] | Mortgages [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Number of Real Estate Properties   9us-gaap_NumberOfRealEstateProperties
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= kim_AcquisitionsMember
53us-gaap_NumberOfRealEstateProperties
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= kim_AcquisitionsMember
Transfers [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Mortgage Loans on Real Estate, Period Increase (Decrease)   36.0us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= kim_TransfersMember
 
Operating Properties [Member] | Repayment of Debt [Member] | Mortgages [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Number of Real Estate Properties   3us-gaap_NumberOfRealEstateProperties
/ us-gaap_DebtInstrumentAxis
= kim_RepaymentofDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= kim_OperatingPropertiesMember
 
Operating Properties [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Number of Real Estate Properties   4us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= kim_OperatingPropertiesMember
 
Repayment of Debt [Member] | Mortgages [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Number of Real Estate Properties   14us-gaap_NumberOfRealEstateProperties
/ us-gaap_DebtInstrumentAxis
= kim_RepaymentofDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
21us-gaap_NumberOfRealEstateProperties
/ us-gaap_DebtInstrumentAxis
= kim_RepaymentofDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Mortgages [Member]      
Note 13 - Mortgages Payable (Details) [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   284.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
742.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Unamortized Fair Value Adjustments During Period   5.8kim_UnamortizedFairValueAdjustmentsDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
39.4kim_UnamortizedFairValueAdjustmentsDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Repayments of Secured Debt   256.3us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
328.0us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Mortgage Loans on Real Estate, Period Increase (Decrease)     15.7us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum     0.08%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum     9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Debt, Weighted Average Interest Rate     5.58%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Unamortized FairValue Debt Adjustments     40.1kim_UnamortizedFairValueDebtAdjustments
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     157.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal in Year Two     363.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal in Year Three     457.6us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal in Year Four     73.1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal in Year Five     10.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Long-term Debt, Maturities, Repayments of Principal after Year Five     $ 326.7us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember