Acquisitions - Schedule of Acquisitions Terms (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Transaction value at 100%	$ 407,705,000	$ 1,063,681,000
Gain on Sale and Change in Control of Interests	4,296,000	19,906,000
Blackstone I Acquisition [Member]
Business Acquisition [Line Items]
Date acquired		2013-10
Number of centers		30
Transaction value at 100%		1,550,000,000
Mortgage debt assumed at 95% (face value)		792,900,000
Mortgage debt repaid at closing		139,000,000
Mortgage debt repaid subsequent to closing		256,000,000
DDR preferred equity interest repaid to DDR		128,400,000
DDR mezzanine loan repaid to DDR		31,700,000
Gain on Sale and Change in Control of Interests		18,800,000
Blackstone II Acquisition [Member]
Business Acquisition [Line Items]
Date acquired	2014-09
Number of centers	7
Transaction value at 100%	395,300,000
Mortgage debt assumed at 95% (face value)	233,300,000
Mortgage debt repaid at closing	28,000,000
DDR preferred equity interest repaid to DDR	31,200,000
Gain on Sale and Change in Control of Interests	$ 4,000,000

Business acquisition, date of acquisition.

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- Definition

Amount of mezzanine loan repaid to the acquirer as part of the consideration transferred in a business acquisition.

+ References

No definition available.

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- Definition

Amount of mortgage indebtedness repaid by the acquirer subsequent to the closing of the acquisition.

+ References

No definition available.

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- Definition

Amount of mortgage indebtedness repaid by the acquirer at the closing of the acquisition.

+ References

No definition available.

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- Definition

The amount represents the face value of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash acquisition.

+ References

No definition available.

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- Definition

Number of real estate properties acquired.

+ References

No definition available.

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- Definition

Amount of preferred equity interest repaid to the acquirer as part of the consideration transferred in a business acquisition.

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

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-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

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-Publisher FASB

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-Topic 805

-SubTopic 30

-Section 50

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- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

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