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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) ft² ShoppingCenter Store | Dec. 31, 2017 USD ($) ft² ShoppingCenter Store Position Officer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2019 Property | Dec. 31, 2018 Property | Feb. 15, 2018 | Jan. 31, 2018 ShoppingCenter
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Estimated insurance recoveries receivable | $ 58,583 | $ 58,583 | $ 0 |  |  |  |  |
Insurance proceeds related to business interruption insurance claims |  | 8,500 | 0 | $ 0 |  |  |  |
Mortgage indebtedness | $ 641,082 | $ 641,082 | $ 982,509 |  |  |  |  |
Mortgage, Weighted Average Interest Rate | 4.20% | 4.20% | 4.90% |  |  |  |  |
Stock-based compensation expense |  | $ 5,500 | $ 900 | $ 500 |  |  |  |
Agreements entered into with general contractors for the construction or redevelopment of shopping centers | $ 19,300 | 19,300 |  |  |  |  |  |
Outstanding letters of credit | 17,300 | 17,300 |  |  |  |  |  |
Affiliate debt guaranty | $ 4,000 | $ 4,000 |  |  |  |  |  |
Mortgage debt maturity, year and month |  | 2020-10 |  |  |  |  |  |
Long-term ground leases expiration period |  | various dates through 2070 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Period space in shopping centers leased |  | 1 month |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Period space in shopping centers leased |  | 30 years |  |  |  |  |  |
Employee Severance [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 4,500 |  |  |  |  |  |
Employee Severance [Member] | Elimination [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Total number of positions eliminated including officer level | Position |  | 65 |  |  |  |  |  |
Number of positions eliminated | Officer |  | 9 |  |  |  |  |  |
General and Administrative [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Separation charge |  | $ 17,900 |  |  |  |  |  |
General and Administrative [Member] | Employee Severance [Member] | Executive Management Transition [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Separation charge |  | 9,400 |  |  |  |  |  |
General and Administrative [Member] | Employee Severance [Member] | Elimination [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Separation charge |  | $ 7,200 |  |  |  |  |  |
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 |  |  |  |  |  |
Gross leasable area of anchor spaces | ft² | 25,000 | 25,000 |  |  |  |  |  |
Insurance Policy Limit |  | $ 330,000 |  |  |  |  |  |
Hurricane casualty and impairment loss |  | $ 6,000 |  |  |  |  |  |
Number of properties encumbered by mortgage/notes | ShoppingCenter | 6 | 6 |  |  |  |  |  |
Mortgage indebtedness | $ 263,400 | $ 263,400 |  |  |  |  |  |
Mortgage, Weighted Average Interest Rate | 4.90% | 4.90% |  |  |  |  |  |
Puerto Rico [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of properties anticipated to be repaired | Property |  |  |  |  |  | 8 |  |
Additional properties to be substantially complete | Property |  |  |  |  | 3 |  |  |
Puerto Rico [Member] | Loss from Catastrophes |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of assets sustained varying degrees of damage | ShoppingCenter | 11 | 11 |  |  |  |  |  |
Percentage of tenants opened in anchor space properties post hurricanes | 79.00% | 79.00% |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 26 | 26 |  |  |  |  |  |
Estimated net book value of the property damage written off | $ 71,000 | $ 71,000 |  |  |  |  |  |
Estimated insurance recoveries receivable | 58,600 | 58,600 |  |  |  |  |  |
Property damage insurance deductible |  | 5,100 |  |  |  |  |  |
Proceeds from insurance claims |  | $ 10,000 |  |  |  |  |  |
Business interruption insurance coverage period after restoration |  | 365 days |  |  |  |  |  |
Rental revenues lost and not recognized |  | $ 11,800 |  |  |  |  |  |
Business interruption insurance claim deductible |  | $ 900 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Business Interruption Income [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Insurance proceeds related to business interruption insurance claims | $ 8,500 |  |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Subsequent Event [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of properties owned, having full utility power post catastrophe | ShoppingCenter |  |  |  |  |  |  |  | 12
Percentage of leased gross leasable area opened in anchor space properties post hurricanes |  |  |  |  |  |  | 85.00% |
Puerto Rico [Member] | Loss from Catastrophes | Plaza Palma Real [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of properties owned that was severely damaged | ShoppingCenter | 1 | 1 |  |  |  |  |  |
Gross leasable area of properties owned that was severely damaged | ft² | 400,000 | 400,000 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Plaza Palma Real [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Percentage of leased gross leasable area opened in anchor space properties post hurricanes |  |  |  |  |  |  | 76.00% |
Puerto Rico [Member] | Loss from Catastrophes | Walmart [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 6 | 6 |  |  |  |  |  |
Number of store in anchor space properties | Store | 7 | 7 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Sam's Club [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 1 | 1 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Home Depot [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 2 | 2 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Sears/Kmart [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 3 | 3 |  |  |  |  |  |
Puerto Rico [Member] | Loss from Catastrophes | Other Grocery Stores [Member] |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Number of stores opened in anchor space properties post hurricanes | Store | 5 | 5 |  |  |  |  |  |

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