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Note 3 - Property Acquisitions, Developments and Other Investments - Previous Ownership Interest and Gain on Change of Interest (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Gain on change in control of interests, net | $ 71,160 |
Plantation Commons [Member] |  |
Previous ownership interest | 76.25% |
Gain on change in control of interests, net | $ 9,793 |
Gordon Plaza [Member] |  |
Previous ownership interest | 40.62% |
Gain on change in control of interests, net | $ 395 |
The District at Tustin Legacy [Member] |  |
Previous ownership interest |  | [1]
Gain on change in control of interests, net | $ 60,972 |
[1] | The Company's share of this investment is subject to change and is based upon a cash flow waterfall provision within the partnership agreement (54.27% as of date of consolidation).

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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=kim_PlantationCommonsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=kim_GordonPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=kim_TheDistrictAtTustinLegacyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |