Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 ft² ShoppingCenter
Contingencies And Commitments [Line Items]
Rental revenues lost and not recognized		$ 6.7
Agreements entered into with general contractors for the construction or redevelopment of shopping centers	$ 12.4
Outstanding letters of credit	13.2
Employee Severance [Member] \| General and Administrative [Member]
Contingencies And Commitments [Line Items]
Separation charge	$ 1.7	$ 4.6
Retail Value Inc. [Member] \| Puerto Rico [Member]
Contingencies And Commitments [Line Items]
Number of properties owned \| ShoppingCenter			12
Gross leasable area of properties owned \| ft²			4,400,000