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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) - Property	12 Months Ended
	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage			25.00%
DDRTC Core Retail Fund LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	TIAA – CREF
Effective Ownership Percentage	15.00%
Operating Properties	23
DDRM Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Madison International Realty
Effective Ownership Percentage	20.00%
Operating Properties	35
BRE DDR Retail Holdings III [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Blackstone Real Estate Partners
Effective Ownership Percentage	5.00%
Operating Properties	16
Dividend Trust Portfolio JV LP [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Chinese Institutional Investors
Effective Ownership Percentage	20.00%	20.00%
Operating Properties	10
BRE DDR Retail Holdings IV [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Blackstone Real Estate Partners
Effective Ownership Percentage	5.00%
Operating Properties	5
DDR-SAU Retail Fund LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	State of Utah
Effective Ownership Percentage	20.00%
Operating Properties	12
Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Various
Operating Properties	5
Minimum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage	20.00%
Maximum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage	79.45%

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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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