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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
ft²
ShoppingCenter
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
ft²
ShoppingCenter
Jun. 30, 2017
USD ($)
Jul. 25, 2018
Store
Dec. 31, 2017
USD ($)
Contingencies And Commitments [Line Items]            
Property insurance receivable $ 49,202   $ 49,202     $ 58,583
Insurance proceeds related to business interruption insurance claims $ 3,100 $ 0 $ 5,100 $ 0    
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 property and impairment loss     $ 6,000      
Puerto Rico [Member] | Loss from Catastrophes            
Contingencies And Commitments [Line Items]            
Number of assets sustained varying degrees of damage | ShoppingCenter 11   11      
Estimated net book value of the property damage written off $ 78,800   $ 78,800      
Property insurance receivable 49,200   $ 49,200      
Received property damage portion of insurance claim 20,200          
Business interruption insurance coverage period after restoration     365 days      
Rental revenues lost and not recognized 2,800   $ 6,600      
Puerto Rico [Member] | Loss from Catastrophes | Business Interruption Income [Member]            
Contingencies And Commitments [Line Items]            
Insurance proceeds related to business interruption insurance claims $ 3,100   $ 5,100      
Puerto Rico [Member] | Loss from Catastrophes | Subsequent Event [Member]            
Contingencies And Commitments [Line Items]            
Percentage of tenants opened in anchor space properties post hurricanes         82.00%  
Number of stores opened in anchor space properties post hurricanes | Store         27  
Percentage of leased gross leasable area opened in anchor space properties post hurricanes         86.00%  
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         82.00%  
Puerto Rico [Member] | Loss from Catastrophes | 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] | Loss from Catastrophes | 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] | Loss from Catastrophes | 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] | Loss from Catastrophes | Other Grocery Stores [Member] | Subsequent Event [Member]            
Contingencies And Commitments [Line Items]            
Number of stores opened in anchor space properties post hurricanes | Store         5  
Puerto Rico [Member] | Loss from Catastrophes | Walmart [Member] | Subsequent Event [Member]            
Contingencies And Commitments [Line Items]            
Number of stores opened in anchor space properties post hurricanes | Store         7