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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, 2016 | Dec. 31, 2015
Phoenix [Member] | AZ [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired | 2016-02 |
Purchase Price | $ 60.5 |
Face Value of Mortgage Debt Assumed | $ 0.0 |
Portland [Member] | OR [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired | 2016-09 |
Purchase Price | $ 86.3 |
Face Value of Mortgage Debt Assumed | $ 0.0 |
Orange County [Member] | CA [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2015-03
Purchase Price |  | $ 49.2
Face Value of Mortgage Debt Assumed |  | $ 33.0
Orlando [Member] | FL [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2015-04
Purchase Price |  | $ 33.0
Face Value of Mortgage Debt Assumed |  | $ 0.0
Houston [Member] | TX [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2015-06
Purchase Price |  | $ 69.8
Face Value of Mortgage Debt Assumed |  | $ 0.0
Orlando [Member] | FL [Member] |  |
Business Acquisition [Line Items] |  |
Date Acquired |  | 2015-12
Purchase Price |  | $ 67.1
Face Value of Mortgage Debt Assumed |  | $ 0.0

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