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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) ft² ShoppingCenter Store | Sep. 30, 2017 USD ($) ft² ShoppingCenter | Sep. 30, 2017 USD ($) ft² ShoppingCenter Position Officer | Dec. 31, 2016 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |
Mortgage indebtedness |  | $ 750,269 | $ 750,269 | $ 982,509
Employee Severance [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Separation charge |  |  | 16,600 |
Stock-based compensation expense |  |  | 4,500 |
Employee Severance [Member] | Accounts Payable and Accrued Expenses [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Accrued separation charge |  | $ 1,400 | 1,400 |
Employee Severance [Member] | Executive Management Transition [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Separation charge |  |  | 9,400 |
Employee Severance [Member] | Elimination [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Separation charge |  |  | $ 7,200 |
Total number of positions eliminated including officer level | Position |  |  | 65 |
Number of positions eliminated | Officer |  |  | 9 |
Puerto Rico [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of properties owned | ShoppingCenter |  | 12 | 12 |
Gross leasable area of properties owned | ft² |  | 4,400,000 | 4,400,000 |
Number of properties owned that was severely damaged | ShoppingCenter |  | 1 | 1 |
Insurance Policy Limit |  |  | $ 330,000 |
Hurricane casualty and impairment loss |  |  | $ 6,000 |
Number of properties encumbered by mortgage notes | ShoppingCenter |  | 6 | 6 |
Mortgage indebtedness |  | $ 264,800 | $ 264,800 |
Weighted average interest rate of mortgage notes |  | 4.90% | 4.90% |
Puerto Rico [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Gross leasable area of anchor spaces | ft² | 25,000 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Gross leasable area of properties owned that was severely damaged | ft² |  | 400,000 | 400,000 |
Estimated net book value of the property damage written off |  | $ 64,800 | $ 64,800 |
Estimated insurance recoveries receivable |  | 59,700 | 59,700 |
Property damage insurance deductible |  | 5,100 | $ 5,100 |
Business interruption insurance coverage period after restoration |  |  | 365 days |
Business interruption insurance claim deductible |  | 900 | $ 900 |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Total Revenue From Operations [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Reduction in rental revenues |  | $ 2,600 | $ 2,600 |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of properties owned available for occupancy post catastrophe | ShoppingCenter | 9 |  |  |
Percentage of tenants opened in anchor space properties post hurricanes | 73.00% |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 24 |  |  |
Advance of insurance proceeds related to business interruption insurance claims | $ 2,000 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Walmart [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 6 |  |  |
Number of store in anchor space properties | Store | 7 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Sam's Club [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 1 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Home Depot [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 2 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Sears/Kmart [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 3 |  |  |
Puerto Rico [Member] | Hurricane Casualty and Impairment Loss [Member] | Other Grocery Stores [Member] | Subsequent Event [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 5 |  |  |

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