Investments in and Advances to Joint Ventures - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) ShoppingCenter	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ShoppingCenter Investment	Jun. 30, 2019 USD ($)	Jul. 14, 2020 USD ($)	Feb. 29, 2020	Dec. 31, 2019 USD ($) ShoppingCenter
Schedule Of Equity Method Investments [Line Items]
Reserve of preferred equity interests	$ 4,878,000	$ 4,634,000	$ 22,935,000	$ 5,733,000
Mortgage debt	53,765,000		53,765,000				$ 94,874,000
Net proceeds from sale of interest in joint venture			140,441,000	0
(Loss) gain on sale of joint venture interest	$ (128,000)	$ 0	45,553,000	$ 0
DDRTC Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of joint venture sold						15.00%
Net proceeds from sale of interest in joint venture			140,400,000
(Loss) gain on sale of joint venture interest			$ 45,600,000
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned | ShoppingCenter	78		78				100
Mortgage debt	$ 1,435,666,000		$ 1,435,666,000				$ 1,640,146,000
Unconsolidated Joint Ventures [Member] | Shopping Centers [Member]
Schedule Of Equity Method Investments [Line Items]
Number of properties sold | ShoppingCenter			1
Proceeds from sale of joint venture assets			$ 25,000,000.0
Company's proportionate share of gain on sale of joint venture assets			$ 1,700,000
BRE DDR Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Number of unconsolidated investments | Investment			2
Maximum preferred investment fixed distribution deferral	2.00%		2.00%
BRE DDR Joint Ventures [Member] | Preferred Equity Fixed Dividend Rate [Member]
Schedule Of Equity Method Investments [Line Items]
Preferred equity fixed dividend rate per annum			8.50%
BRE DDR III [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of unrestricted cash held					50.00%
Unrestricted cash	$ 13,600,000		$ 13,600,000
Additional cash to be received upon closing					$ 1,900,000
BRE DDR III [Member] | Affiliate of Blackstone [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	95.00%		95.00%
BRE DDR III [Member] | Affiliates of SITE Centers [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	5.00%		5.00%
BRE DDR IV [Member]
Schedule Of Equity Method Investments [Line Items]
Mortgage debt	$ 147,000,000.0		$ 147,000,000.0
Consideration Paid For Transfer Of Interest	1.00		1.00
Restricted And Unrestricted Cash	$ 11,200,000		$ 11,200,000
BRE DDR IV [Member] | Affiliate of Blackstone [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	95.00%		95.00%
BRE DDR IV [Member] | Affiliates of SITE Centers [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	5.00%		5.00%
White Oak Village and Midtowne Park [Member]
Schedule Of Equity Method Investments [Line Items]
Mortgage debt	$ 50,000,000.0		$ 50,000,000.0
BRE DDR IV Properties Currently Owned [Member]
Schedule Of Equity Method Investments [Line Items]
Mortgage debt	$ 125,100,000		$ 125,100,000