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