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Investments in and Advances to Joint Ventures - Summary of Company's Equity Method Joint Ventures Included in Investments in and Advances (Detail)	12 Months Ended
	Dec. 31, 2021 Property
DDRM Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Madison International Realty
Effective Ownership Percentage	20.00%
Operating Properties	24
Dividend Trust Portfolio JV LP [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Chinese Institutional Investors
Effective Ownership Percentage	20.00%
Operating Properties	10
DDR-SAU Retail Fund LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	State of Utah
Effective Ownership Percentage	20.00%
Operating Properties	11
Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Various
Operating Properties	2
Minimum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage	25.75%
Maximum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage	50.00%

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+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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

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