Acquisitions - Summary of Acquired Shopping Centers (Detail) - Shopping Center [Member] $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
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