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Disposal of Operating Properties and Investment Properties Held for Sale - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 4 Months Ended 2 Months Ended
Mar. 31, 2015
property
Mar. 16, 2015
tranche
Dec. 31, 2014
property
Sep. 16, 2014
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of Real Estate Properties 117us-gaap_NumberOfRealEstateProperties   61us-gaap_NumberOfRealEstateProperties 15us-gaap_NumberOfRealEstateProperties
Number of Disposal Tranches   2krg_NumberofDisposalTranches    
Proceeds from Sale of Real Estate Held-for-investment $ 94.7us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment      
Disposal Tranche I [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of Real Estate Properties     8us-gaap_NumberOfRealEstateProperties
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIMember
 
Disposal Group, Including Discontinued Operation, Assets     150.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIMember
 
Gain (Loss) on Sale of Properties     1.4us-gaap_GainLossOnSaleOfProperties
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIMember
 
Disposal Tranche II [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of Real Estate Properties   7us-gaap_NumberOfRealEstateProperties
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIIMember
   
Disposal Group, Including Discontinued Operation, Assets 103.0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIIMember
     
Gain (Loss) on Sale of Properties $ 3.4us-gaap_GainLossOnSaleOfProperties
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= krg_DisposalTrancheIIMember