Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) ShoppingCenter	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) ShoppingCenter Investment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) ShoppingCenter
Schedule Of Equity Method Investments [Line Items]
Reserve of preferred equity interests	$ 4,634	$ (1,625)	$ 5,733	$ 2,336
Preferred investment interest valuation allowance	$ 78,200		$ 78,200		$ 72,400
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Shopping centers owned | ShoppingCenter	102		102		106
Unconsolidated Joint Ventures [Member] | Shopping Centers [Member]
Schedule Of Equity Method Investments [Line Items]
Number of properties sold | ShoppingCenter			4
Proceeds from sale of joint venture assets			$ 128,200
Gain on sale of joint venture assets			$ 1,500
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]
Ownership interest of joint venture partner	95.00%		95.00%
Ownership interest in joint venture	5.00%		5.00%
BRE DDR IV [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest of joint venture partner	95.00%		95.00%
Ownership interest in joint venture	5.00%		5.00%