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Note 8 - Marketable Securities and Other Investments (Details) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Apr. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Note 8 - Marketable Securities and Other Investments (Details) [Line Items] |  |  |  |  |  |  |
Marketable Securities | $ 105,253,000 us-gaap_MarketableSecurities | [1] |  |  |  | $ 90,235,000 us-gaap_MarketableSecurities | [1]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 61,900,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |  |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities | 700,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities |  | 219,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities |  |  |  |
Subsequent Event [Member] | Supervalu Inc. [Member] |  |  |  |  |  |  |
Note 8 - Marketable Securities and Other Investments (Details) [Line Items] |  |  |  |  |  |  |
Marketable Securities, Number of Shares Sold (in Shares) |  |  |  | 6.4 kim_MarketableSecuritiesNumberOfSharesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_SupervaluIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  |  | 58,600,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_SupervaluIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Marketable Securities, Realized Gain (Loss) |  |  |  |  | $ 32,400,000 us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_SupervaluIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
[1] | As of March 31, 2015 and December 31, 2014, the Company determined that $102.7 million and $87.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $2.4 million and $2.3 million, respectively, were classified within Level 3 of the fair value hierarchy.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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