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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
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Jan. 02, 2019 USD ($) | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2019 USD ($) JointVenture $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jan. 01, 2019 USD ($) ShoppingCenter Office | Dec. 31, 2018 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Maximum exposure to losses associated with VIEs |  | $ 164,300 |  | $ 164,300 |  |  | $ 192,200
Common share dividend declared per share | $ / shares |  | $ 0.20 | $ 0.20 | $ 0.60 | $ 0.96 |  |
Number of shopping centers leased under ground lease agreements | ShoppingCenter |  |  |  |  |  | 3 |
Number of additional lease agreements where company is lessee | Office |  |  |  |  |  | 3 |
ROU assets |  | $ 21,628 |  | $ 21,628 |  | $ 22,000 | $ 0
Lease liabilities |  | $ 40,518 |  | $ 40,518 |  | $ 40,300 |
Reversal of real estate taxes paid by tenants | $ 1,700 |  |  |  |  |  |
Adjustment for Contractual Lease Payments [Member] | ASU 2016-02 [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Reclassification adjustments |  |  | $ 1,400 |  | $ 11,500 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |  |  |
Number of unconsolidated joint ventures | JointVenture |  |  |  | 2 |  |  |

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