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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% |  |

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