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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 02, 2019 USD ($) | Mar. 31, 2019 USD ($) JointVenture ShoppingCenter Office $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |
Maximum exposure to losses associated with VIEs |  | $ 178,000 |  | $ 192,200
Common share dividend declared per share | $ / shares |  | $ 0.20 | $ 0.38 |
Number of shopping centers leased under ground lease agreements | ShoppingCenter |  | 3 |  |
Number of additional lease agreements where company is lessee | Office |  | 3 |  |
ROU assets |  | $ 21,962 |  | $ 0
Lease liabilities |  | $ 40,303 |  |
Reversal of real estate taxes paid by tenants | $ 1,700 |  |  |
Adjustment for Property Management and Services [Member] |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |
Reclassification adjustments |  |  | $ 3,300 |
Adjustment for Contractual Lease Payments [Member] | ASU 2016-02 [Member] |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |
Reclassification adjustments |  |  | $ 3,700 |
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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