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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) ft² ShoppingCenter | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Property insurance receivable | $ 0 |  |  | $ 0 |  | $ 58,583
Rental revenues lost and not recognized |  |  | $ 6,600 |  |  |
Insurance proceeds related to business interruption insurance claims | $ 1,784 | $ 0 |  | $ 6,884 | $ 0 |
Retail Value Inc. [Member] | Puerto Rico [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Number of properties owned | ShoppingCenter |  |  | 12 |  |  |
Gross leasable area of properties owned | ft² |  |  | 4,400,000 |  |  |
Retail Value Inc. [Member] | Puerto Rico [Member] | Loss from Catastrophes [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Number of assets sustained varying degrees of damage | ShoppingCenter |  |  | 11 |  |  |
Estimated net book value of the property damage written-off |  |  | $ 78,800 |  |  |
Property insurance receivable |  |  | 49,200 |  |  |
Remaining insurance receivable related to expenses |  |  | $ 1,200 |  |  |
Business interruption insurance coverage period after restoration |  |  |  | 365 days |  |
Retail Value Inc. [Member] | Puerto Rico [Member] | Loss from Catastrophes [Member] | Plaza Palma Real [Member] |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Number of properties owned that was severely damaged | ShoppingCenter |  |  | 1 |  |  |
Gross leasable area of properties owned that was severely damaged | ft² |  |  | 400,000 |  |  |

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