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Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) ShoppingCenter | Jun. 30, 2018 USD ($) ShoppingCenter Investment Assets | Dec. 31, 2017 ShoppingCenter
Schedule Of Equity Method Investments [Line Items] |  |  |
Preferred investment interest valuation allowance | $ 63.4 | $ 63.4 |
Preferred investment interest adjusted valuation allowance | $ (1.6) | 2.3 |
Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Gain on sale of joint venture assets |  | $ 9.3 |
Unconsolidated Joint Ventures [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Shopping centers owned | ShoppingCenter | 114 | 114 | 136
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 III [Member] | Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of properties sold | Assets |  | 9 |
Proceeds from sale of joint venture assets |  | $ 193.9 |
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% |
BRE DDR IV [Member] | Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of properties sold | Assets |  | 1 |
Proceeds from sale of joint venture assets |  | $ 40.0 |
DDRM Properties [Member] | Shopping Centers and Land [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Number of properties sold | Assets |  | 12 |
Proceeds from sale of joint venture assets |  | $ 191.8 |

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