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Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]      
Reserve of preferred equity interests and accrued interest $ 105,300 $ 84,600 $ 67,300
Allowance for uncollectible accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions of allowance $ 552    
Allowance for uncollectible accounts [Member] | Spin-off [Member] | Retail Value Inc. [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions of allowance   13,500  
Valuation allowance for deferred and prepaid tax assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions of allowance   22,807 $ 23,470
Valuation allowance for deferred and prepaid tax assets [Member] | Spin-off [Member] | Retail Value Inc. [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions of allowance   $ 14,800