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Investment in and Advances to Affiliate - Additional Information (Detail) - Retail Value Inc. [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Investments In And Advances To Affiliates [Line Items] |  |
Preferred investment | $ 190.0 |
Receivable from affiliate consisting of restricted cash and insurance premiums | $ 16.7 | $ 34.0

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