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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, 2019
Property
DDRTC Core Retail Fund LLC [Member]  
Schedule Of Equity Method Investments [Line Items]  
Partner TIAA – CREF
Effective Ownership Percentage 15.00%
Operating Properties 21
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 13
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
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 12
Other Joint Venture Interests [Member]  
Schedule Of Equity Method Investments [Line Items]  
Partner Various
Operating Properties 4
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%