Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) ShoppingCenter Investment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) ShoppingCenter
Schedule Of Equity Method Investments [Line Items]
Reserve of preferred equity interests	$ 1,099	$ 3,961
Preferred investment interest valuation allowance	$ 73,500		$ 72,400
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned | ShoppingCenter	103		106
Unconsolidated Joint Ventures [Member] | Shopping Centers [Member]
Schedule Of Equity Method Investments [Line Items]
Number of properties sold | ShoppingCenter	3
Proceeds from sale of joint venture assets	$ 92,300
Gain on sale of joint venture assets	$ 1,600
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]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	95.00%
Ownership interest in joint venture	5.00%
BRE DDR IV [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	95.00%
Ownership interest in joint venture	5.00%