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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, 2017	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage		25.00%
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	37
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	6
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	52
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	6
Minimum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Various
Effective Ownership Percentage	20.00%
Maximum [Member] | Other Joint Venture Interests [Member]
Schedule Of Equity Method Investments [Line Items]
Partner	Various
Effective Ownership Percentage	79.45%

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Equity method joint ventures partner description.

+ References

No definition available.

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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=66011266&loc=d3e33918-111571

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