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Acquisitions - Schedule of Company Acquired Shopping Centers (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Vintage Plaza [Member] | Austin, TX [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired | 2019-10 |
Purchase Price | $ 12.6 |
The Blocks [Member] | Portland, OR [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired | 2019-11 |
Purchase Price | $ 50.5 |
Southtown Center [Member] | Tampa, FL [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired | 2019-12 |
Purchase Price | $ 22.0 |
Sharon Greens [Member] | Cumming, GA [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2018-11
Purchase Price |  | $ 13.4
Melbourne Shopping Center [Member] | Melbourne, FL [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2018-11
Purchase Price |  | $ 11.4
Market Square [Member] | Douglasville, GA [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2018-12
Purchase Price |  | $ 10.3

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