Acquisitions - Summary of Acquired Shopping Centers (Detail) - Shopping Center [Member] - USD ($) $ in Millions	12 Months Ended
	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