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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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- 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 + Details
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