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Acquisitions - Summary of Acquired Shopping Centers (Detail) - Shopping Center [Member] - USD ($) $ in Millions	12 Months Ended
	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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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