Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) ShoppingCenter Investment	Mar. 31, 2019 USD ($)	Feb. 29, 2020	Dec. 31, 2019 ShoppingCenter
Schedule Of Equity Method Investments [Line Items]
Reserve of preferred equity interests	$ 18,057	$ 1,099
Net proceeds from sale of interest in joint venture	140,519	0
Gain on sale of joint venture interest	45,681	$ 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	140,500
Gain on sale of joint venture interest	$ 45,700
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned | ShoppingCenter	78			100
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
Company's proportionate share of gain on sale of joint venture assets	$ 1,700
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%
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] | Affiliate of Blackstone [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	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%
BRE DDR IV [Member] | Affiliate of Blackstone [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	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%