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Nature of Business and Financial Statement Presentation - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) ShoppingCenter shares | May 18, 2018 | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) ShoppingCenter JointVenture | Sep. 30, 2017 USD ($) | Jun. 26, 2018 | Dec. 31, 2017 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness |  |  |  | $ 185,004,000 |  |  | $ 641,082,000
Maximum exposure to losses associated with VIEs |  |  |  | $ 205,900,000 |  |  | $ 284,100,000
Reclassification of costs form general and administrative to operating and maintenance |  |  | $ 3,000,000 |  | $ 9,800,000 |  |
Number of shopping centers leased under ground lease agreements | ShoppingCenter |  |  |  | 3 |  |  |
Common Shares |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Reverse stock split |  |  |  | one-for-two |  |  |
Reverse stock split conversion ratio |  | 0.5 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Number of unconsolidated joint ventures | JointVenture |  |  |  | 2 |  |  |
Retail Value Inc. [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Cumulative redeemable preferred shares, shares issued | shares | 1,000 |  |  |  |  |  |
Retail Value Inc. [Member] | Series A Preferred Stock [Member] | Aggregate Gross Proceeds of RVI's Asset Sales Subsequent to July 1, 2018 Exceeds $2.0 Billion [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Preferred stock, value | $ 190,000,000 |  |  |  |  |  |
Maximum increase in preferred stock amount | $ 10,000,000 |  |  |  |  |  |
Spin-off [Member] | Maximum [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Dividend payments to be received will be recorded as reduction of preferred shares carrying value |  |  |  | $ 190,000,000 |  |  |
Spin-off [Member] | Retail Value Inc. [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 48 |  |  |  |  |  |
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 SITE Centers’ common shares received one common share of RVI for every ten shares of SITE Centers’ common stock held on the record date. |  |  |
Spin-off [Member] | Retail Value Inc. [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Cumulative redeemable preferred shares, shares issued | shares | 1,000 |  |  |  |  |  |
Spin-off [Member] | Retail Value Inc. [Member] | Series A Preferred Stock [Member] | Aggregate Gross Proceeds of RVI's Asset Sales Subsequent to July 1, 2018 Exceeds $2.0 Billion [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Preferred stock, value | $ 190,000,000 |  |  |  |  |  |
Maximum increase in preferred stock amount | 10,000,000 |  |  |  |  |  |
Spin-off [Member] | Retail Value Inc. [Member] | Mortgages [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness | $ 1,270,000,000 |  |  |  |  |  |
U.S. [Member] | Spin-off [Member] | Retail Value Inc. [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 36 |  |  |  |  |  |
Puerto Rico [Member] | Spin-off [Member] | Retail Value Inc. [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Number of shopping centers in connection with spinoff | ShoppingCenter | 12 |  |  |  |  |  |

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