Acquisitions - Summary of Acquired Shopping Centers (Detail) - Shopping Center [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Phoenix [Member] | AZ [Member]
Business Acquisition [Line Items]
Date Acquired	2016-02
Purchase Price	$ 60.5
Portland [Member] | OR [Member]
Business Acquisition [Line Items]
Date Acquired	2016-09
Purchase Price	$ 86.3