Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Significant Noncash Transactions [Line Items]
Accounts payable related to construction in progress	$ 11,000	$ 9,300	$ 13,400
Mortgage assumed, shopping center acquisition	9,100	0	0
Write-off of preferred share original issuance costs (Note 12)	7,176	0	0
Dividends declared, but not paid	44,036	45,262	78,500
Land acquired by minority interest partner	0	2,300	0
Conversion of Operating Partnership Units	0	900	0
Receivable and reduction of real estate assets, net – related to hurricane	0	0	65,900
Retail Value Inc. [Member]
Other Significant Noncash Transactions [Line Items]
Contribution of net assets to RVI	0	663,400	0
Building [Member]
Other Significant Noncash Transactions [Line Items]
Assumption of buildings due to ground lease terminations	$ 0	$ 2,200	$ 8,600