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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
ft²
tenant
store
property
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Significant Accounting Policies [Line Items]        
Number of shopping centers | store 29      
Percentage of ownership in operating partnership 74.30%      
Interest expense capitalized $ 2,527,000 $ 2,166,000 $ 689,000  
Depreciation and amortization of deferred leasing costs 38,755,000 37,698,000 35,933,000  
Repairs and maintenance expense 11,800,000 11,600,000 11,900,000  
Deferred leasing costs, net 25,983,000 26,919,000    
Accumulated amortization deferred leasing cost 30,400,000 26,600,000    
Amortization expense deferred leasing cost 5,700,000 5,600,000 5,300,000  
Allowance for doubtful accounts receivables 1,958,000 1,263,000 677,000 $ 572,000
Accounts receivable, net representing rental income accrued 43,100,000 41,400,000    
Allowance for doubtful accounts receivables representing rental income accrued 500,000 500,000    
Real estate held-for-sale 3,400,000      
Real estate, accumulated depreciation 458,279,000 425,370,000 396,617,000 $ 364,663,000
Real estate, costs to sell and liabilities 200,000      
Unamortized deferred debt costs 7,485,000 8,700,000    
Accumulated amortization 7,300,000 6,200,000    
Accrued penalties and interest 0 0 $ 0  
Tax basis of the company's real estate investments $ 1,300,000,000 $ 1,100,000,000    
Shares issued to directors (in shares) | shares 251,323 117,886 172,887  
Shares issued to directors $ 1,348,000 $ 1,176,000 $ 965,000  
Director        
Significant Accounting Policies [Line Items]        
Shares credited to deferred fee accounts (in shares) | shares 246,800      
Shares issued to directors (in shares) | shares 200 200 200  
Shares issued to directors $ 150,100 $ 143,000 $ 112,900  
Property Held-for-sale        
Significant Accounting Policies [Line Items]        
Number of real estate properties | property 1      
Net rentable area (in square feet) | ft² 197,100      
Real estate, accumulated depreciation $ 7,000,000      
Minimum | Building        
Significant Accounting Policies [Line Items]        
Estimated useful life 35 years      
Maximum | Building        
Significant Accounting Policies [Line Items]        
Estimated useful life 50 years      
Maximum | Building Improvements        
Significant Accounting Policies [Line Items]        
Estimated useful life 20 years      
Revenue        
Significant Accounting Policies [Line Items]        
Number of tenants | tenant 3      
Revenue | Minimum        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.50%      
Revenue | Giant Food        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 4.30%      
Number of shopping centers | store 9      
Revenue | Capital One        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.80%      
Number of shopping centers | store 20      
Revenue | Safeway        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.60%      
Number of shopping centers | store 9