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Investments in and Advances to Joint Ventures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		0 Months Ended	6 Months Ended	4 Months Ended	6 Months Ended
	Jun. 30, 2014 Unconsolidated Joint Ventures [Member] ShoppingCenter	Dec. 31, 2013 Unconsolidated Joint Ventures [Member] ShoppingCenter	Apr. 28, 2014 DDR [Member]	Jun. 30, 2014 DDR [Member]	Apr. 28, 2014 Sonae Sierra Brazil [Member] ExchangeRate	Jun. 30, 2013 Sonae Sierra Brazil [Member] ExchangeRate	Jun. 30, 2014 Sonae Sierra Brazil [Member]	Jun. 30, 2014 Sonae Sierra Brazil [Member] Shopping Centers [Member] ShoppingCenter
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned	154	170						10
Ownership interest in joint venture			50.00%				66.00%
Proceeds from sale of unconsolidated joint venture assets			$ 343.6
Investment interest percentage				33.00%
Weighted-average exchange rate used for recording the equity in net income					2.26	2.02
Number of properties sold	8
Proceeds from sale of unconsolidated joint venture assets	101.7			20.3
Gain on sale of unconsolidated joint venture assets	$ 23.5			$ 6.3

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Effective ownership percentage in an investment accounted for using the equity method.

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Number of assets sold.

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Weighted-average exchange rate used for recording the equity in net income in U.S. dollars for an investment accounted for using the equity method.

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- Definition

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 35

-URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32847-111569

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230



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-Section 50

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The number of real estate properties owned as of the balance sheet date.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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