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Acquisitions - Summary of Acquired Shopping Centers (Detail) - Shopping Center [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Chicago [Member] | IL [Member] |  |
Business Acquisition [Line Items] |  |
Asset | 3030 North Broadway |
Date Acquired | 2017-01 |
Purchase Price | $ 81.0 |
Phoenix [Member] | AZ [Member] |  |
Business Acquisition [Line Items] |  |
Asset |  | Palm Valley Pavilions West
Date Acquired |  | 2016-02
Purchase Price |  | $ 60.5
Portland [Member] | OR [Member] |  |
Business Acquisition [Line Items] |  |
Asset |  | Gresham Station
Date Acquired |  | 2016-09
Purchase Price |  | $ 86.3

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