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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
ft²
tenant
store
property
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
USD ($)
Significant Accounting Policies [Line Items]        
Number of shopping centers | store 31      
Number of tenants | tenant 2      
Interest expense capitalized $ 2,166,000 $ 689,000 $ 170,000  
Depreciation expense and amortization of leasehold improvements 37,698,000 35,933,000 43,204,000  
Repairs and maintenance expense 11,600,000 11,900,000 10,300,000  
Deferred leasing costs, net 26,919,000 26,928,000    
Accumulated amortization deferred leasing cost 26,600,000 21,600,000    
Amortization expense deferred leasing cost 5,600,000 5,300,000 5,900,000  
Allowance for doubtful accounts receivables 1,263,000 677,000 572,000 $ 1,208,000
Accounts receivable, net representing rental income accrued 41,400,000 38,700,000    
Allowance for doubtful accounts receivables representing rental income accrued 500,000 300,000    
Real estate held-for-sale 3,400,000      
Real estate, accumulated depreciation 425,370,000 396,617,000 364,663,000 $ 353,305,000
Real estate, costs to sell and liabilities 200,000      
Deferred debt costs, net 8,737,000 9,874,000    
Accumulated amortization deferred leasing cost 6,200,000 5,900,000    
Accrued penalties and interest 0 0 $ 0  
Tax basis of the company's real estate investments $ 1,100,000,000 $ 1,200,000,000    
Shares issued to directors, shares | shares 117,886 172,887 56,002  
Percentage of ownership in operating partnership 74.20%      
Options        
Significant Accounting Policies [Line Items]        
Antidilutive options (in shares) | shares 111,000 107,000 113,000  
Director        
Significant Accounting Policies [Line Items]        
Shares credited to deferred fee accounts | shares 241,949      
Shares issued to directors, shares | shares 200 200 200  
Shares issued to directors, value $ 143,000 $ 112,900 $ 124,400  
Minimum        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.50%      
Giant Food        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 4.40%      
Number of shopping centers | store 9      
Safeway        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.70%      
Number of shopping centers | store 9      
Building | Minimum        
Significant Accounting Policies [Line Items]        
Estimated useful life 35 years      
Building | Maximum        
Significant Accounting Policies [Line Items]        
Estimated useful life 50 years      
Building Improvements | Maximum        
Significant Accounting Policies [Line Items]        
Estimated useful life 20 years      
Property Held-for-sale        
Significant Accounting Policies [Line Items]        
Number of Real Estate Properties | property 1      
Net rentable area | ft² 197,127      
Real estate, accumulated depreciation $ 7,000,000