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Investment in and Advances to Affiliate - Schedule of Revenue From Contracts With Customers Included in Fee and Other Income on Consolidated Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI $ 8,358 $ 8,620 $ 16,063 $ 23,367
Retail Value Inc. [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 5,200 5,500 9,900 13,200
Asset and Property Management Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 6,602 7,551 13,177 16,876
Asset and Property Management Fees [Member] | Retail Value Inc. [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 4,000 4,800 7,900 9,700
Leasing Commissions [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 1,038 682 2,055 3,678
Leasing Commissions [Member] | Retail Value Inc. [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 600 500 1,400 1,700
Disposition Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI 592 210 592 1,766
Disposition Fees [Member] | Retail Value Inc. [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue from contracts with RVI $ 600 $ 200 $ 600 $ 1,800