Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Acquisition costs related to assets	$ 2,100,000
Revenues from the date of acquisition	7,700,000	13,900,000
Gain on Sale and Change in Control of Interests	3,977,000
Blackstone II Acquisition [Member]
Business Acquisition [Line Items]
Number of power centers acquired	7
Value of transaction	395,300,000
Ownership interest percentage	100.00%
Ownership interest of joint venture partner	95.00%
Debt assumed	233,300,000
Mortgage debt assumed repaid at closing	28,000,000
Preferred equity interest repaid	31,200,000
Gain on Sale and Change in Control of Interests	$ 4,000,000