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Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Property Investment | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) Property
Schedule Of Equity Method Investments [Line Items] |  |  |
Reserve of preferred equity interests | $ 15,544 | $ 11,422 | $ 61,000
Dividend, aggregate amount | 17,300 | 12,200 |
Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Gain on sale of joint venture assets | $ 4,200 | $ 13,700 | $ 5,700
Unconsolidated Joint Ventures [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of properties sold | Property | 6 | 40 | 15
Unconsolidated Joint Ventures [Member] | Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of properties sold | Property |  | 3 |
Proceeds from sale of joint venture assets | $ 356,300 | $ 786,500 | $ 545,600
Proceeds from sale of joint venture assets to company |  | $ 35,100 |
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% |  |
Redemption of preferred equity in full or in part at partners option | during the first three years |  |
Redemption of preferred investment in full at company option | after seven years |  |
Dividend, cash interest rate | 6.50% |  |
Dividend, accrued PIK interest rate | 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] |  |  |
Redemption of preferred investment in full at company option year | 2021 |  |
BRE DDR III [Member] | Preferred Shares [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Net asset sale proceeds allocation percentage | 52.90% |  |
BRE DDR III [Member] | Common Equity [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Net asset sale proceeds allocation percentage | 47.10% |  |
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] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Redemption of preferred investment in full at company option year | 2022 |  |
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% |  |

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