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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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI $ 55,988 $ 42,788 $ 30,553
Retail Value Inc. [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 30,000 17,100  
Asset and Property Management Fees [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 42,355 31,751 21,494
Asset and Property Management Fees [Member] | Retail Value Inc. [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 21,700 12,900  
Leasing Commissions [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 6,300 6,380 7,138
Leasing Commissions [Member] | Retail Value Inc. [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 3,100 1,100  
Disposition Fees [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 3,454 2,959 0
Disposition Fees [Member] | Retail Value Inc. [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 3,300 3,000  
Credit Facility Guaranty and Refinancing Fees [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI 1,860 60 $ 0
Credit Facility Guaranty and Refinancing Fees [Member] | Retail Value Inc. [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue from contracts with RVI $ 1,900 $ 100