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Investment In and Advances to Affiliate - Additional Information (Detail) - Retail Value Inc. [Member] - USD ($)
Jul. 01, 2018
Dec. 31, 2018
Investments In And Advances To Affiliates [Line Items]    
Receivable from affiliate consisting of restricted cash and insurance premiums   $ 34,000,000.0
Series A Preferred Stock [Member] | Aggregate Gross Proceeds of RVI's Asset Sales Subsequent to July 1, 2018 Exceeds $2.0 Billion [Member]    
Investments In And Advances To Affiliates [Line Items]    
Preferred stock, value $ 190,000,000  
Maximum increase in preferred stock amount 10,000,000  
Threshold limit for proceeds from sale of real estate investment property $ 2,000,000,000.0  
Series A Preferred Stock [Member] | To Redeem RVI Preferred Shares Upon Aggregate Dividends Payments Equalling $200 Million [Member]    
Investments In And Advances To Affiliates [Line Items]    
Preferred stock, redemption price $ 1.00  
Series A Preferred Stock [Member] | Maximum [Member] | To Redeem RVI Preferred Shares Upon Aggregate Dividends Payments Equalling $200 Million [Member]    
Investments In And Advances To Affiliates [Line Items]    
Preferred stock, value $ 200,000,000