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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