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Investments in and Advances to Joint Ventures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2014 ShoppingCenter	Dec. 31, 2013 ShoppingCenter	Mar. 31, 2014 Sonae Sierra Brazil [Member] ExchangeRate	Mar. 31, 2013 Sonae Sierra Brazil [Member] ExchangeRate	Apr. 28, 2014 Sonae Sierra Brazil [Member] Subsequent Event [Member]	Mar. 31, 2014 Sonae Sierra Brazil [Member] Shopping Centers [Member] ShoppingCenter	Mar. 31, 2014 DDR [Member]
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned	166	170				10
Ownership interest in joint venture			66.00%		50.00%	50.00%
Weighted-average exchange rate used for recording the equity in net income			2.36	2.01
Investement interest percentage			33.00%
Proceeds from sale of unconsolidated joint venture assets	$ 67.7				$ 343.6		$ 14.0
Number of properties sold	4
Number of joint ventures with assets sold	3
Gain on sale of unconsolidated joint venture assets	$ 21.5						$ 5.4

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Investment Interest Percentage

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Number of assets sold.

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Number of joint ventures with assets sold.

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Weighted-average exchange rate used for recording the equity in net income.

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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.

+ References

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 an equity method investment.

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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.

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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