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Acquisitions - Summary of Acquired Shopping Centers (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Blackstone II Acquisition [Member]
Business Acquisition [Line Items]
Face Value of Mortgage Debt Assumed	$ 233.3
Shopping Centers [Member]
Business Acquisition [Line Items]
Gross Purchase Price	673.2
Face Value of Mortgage Debt Assumed	281.7
Shopping Centers [Member] | Colorado Springs [Member] | Colorado [Member]
Business Acquisition [Line Items]
Date Acquired	April 2014
Gross Purchase Price	29.4
Face Value of Mortgage Debt Assumed	12.9
Shopping Centers [Member] | Roseville [Member] | California [Member]
Business Acquisition [Line Items]
Date Acquired	May 2014
Gross Purchase Price	89.5
Face Value of Mortgage Debt Assumed	0
Shopping Centers [Member] | Cincinnati [Member] | Ohio [Member]
Business Acquisition [Line Items]
Date Acquired	May 2014
Gross Purchase Price	29.5
Face Value of Mortgage Debt Assumed	0
Shopping Centers [Member] | Chicago [Member] | Illinois [Member]
Business Acquisition [Line Items]
Date Acquired	June 2014
Gross Purchase Price	98.0
Face Value of Mortgage Debt Assumed	35.5
Shopping Centers [Member] | Philadelphia [Member] | Pennsylvania [Member]
Business Acquisition [Line Items]
Date Acquired	August 2014
Gross Purchase Price	31.5
Face Value of Mortgage Debt Assumed	0
Shopping Centers [Member] | Blackstone II Acquisition [Member]
Business Acquisition [Line Items]
Date Acquired	September 2014
Gross Purchase Price	395.3
Face Value of Mortgage Debt Assumed	$ 233.3

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- Definition

Business acquisition, date of acquisition.

+ References

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+ Details

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- Definition

Business acquisitions, cost of acquired entity, purchase price gross.

+ References

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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.

+ Details

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