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Subsequent Events - Additional Information (Detail) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) ShoppingCenter shares | Jun. 30, 2018 USD ($) | Jul. 02, 2018 USD ($) | Jun. 26, 2018 | Dec. 31, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |  |
Mortgage indebtedness |  | $ 1,428,025,000 |  |  | $ 641,082,000
Unsecured Debt [Member] | Revolving Credit Facility [Member] | PNC Bank National Association [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  | 50,000,000 |  |  |
Subsequent Event [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | PNC Bank National Association [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  |  | $ 20,000,000 |  |
U.S. [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 36 |  |  |  |
Puerto Rico [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 12 |  |  |  |
Retail Value Inc. [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Gross asset value |  | $ 2,700,000,000 |  |  |
Percentage of distribution of outstanding common shares rights to holders |  |  |  | 100.00% |
Spin off distribution description |  | On the spin-off date, holders of DDR’s common shares received one common share of RVI for every ten shares of DDR common stock held on the record date. |  |  |
Preferred stock, value |  | $ 190,000,000 |  |  |
Retail Value Inc. [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 48 |  |  |  |
Gross asset value | $ 2,700,000,000 |  |  |  |
Mortgage indebtedness | $ 1,270,000,000 |  |  |  |
Retail Value Inc. [Member] | Subsequent Event [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | PNC Bank National Association [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  |  | $ 30,000,000 |  |
Retail Value Inc. [Member] | Subsequent Event [Member] | Series A Preferred Stock [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cumulative redeemable preferred shares, shares issued | shares | 1,000 |  |  |  |
Preferred stock, value | $ 190,000,000 |  |  |  |
Maximum increase in preferred stock amount | $ 10,000,000 |  |  |  |
Retail Value Inc. [Member] | U.S. [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 36 |  |  |  |
Retail Value Inc. [Member] | Puerto Rico [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 12 |  |  |  |

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- Definition Number of shopping centers subject to spin off. + References No definition available. + Details
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- Definition Percentage of distribution of outstanding common shares rights to holders. + References No definition available. + Details
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