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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 |

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- Definition Valuation allowance of preferred equity interest and accrued interest. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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