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Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Reserve of preferred equity interests $ 72,400 $ 61,000  
Allowance for uncollectible accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions of allowance 13,444 2,894 $ 2,568
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