Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	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