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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
tenant
store
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]        
Number of shopping centers | store 32      
Capitalized interest $ (6,222,000) $ (3,489,000) $ (2,527,000)  
Depreciation and amortization of deferred leasing costs 39,768,000 40,197,000 38,755,000  
Repairs and maintenance expense 11,900,000 11,600,000 11,800,000  
Deferred leasing costs, net 28,083,000 27,255,000    
Accumulated amortization deferred leasing cost 37,700,000 35,300,000    
Amortization expense deferred leasing cost 6,100,000 5,500,000 5,600,000  
Allowance for doubtful accounts receivables 559,000 405,000 1,958,000 $ 1,263,000
Accounts receivable, net representing rental income accrued 43,300,000 44,100,000    
Allowance for doubtful accounts receivables representing rental income accrued 100,000 200,000    
Deferred debt costs, net of accumulated amortization 10,343,000 6,900,000    
Accumulated amortization 7,300,000 8,200,000    
Accrued penalties and interest 0 0 $ 0  
Tax basis of the company's real estate investments $ 1,350,000,000 $ 1,320,000,000    
Shares issued to directors (in shares) | shares 43,150 152,758 251,323  
Shares issued to directors $ 1,558,000 $ 1,448,000 $ 1,348,000  
Capitalized lease costs $ 2,100,000      
Director        
Significant Accounting Policies [Line Items]        
Shares credited to deferred fee accounts (in shares) | shares 114,644      
Shares issued to directors (in shares) | shares 200 200 200  
Shares issued to directors $ 108,800 $ 130,700 $ 150,100  
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 2      
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 4.70%      
Number of shopping centers | store 10      
Revenue | Capital One        
Significant Accounting Policies [Line Items]        
Percentage of total revenue 2.70%      
Number of shopping centers | store 17      
Glebe Road Construction Loan        
Significant Accounting Policies [Line Items]        
Deferred debt costs, net of accumulated amortization $ 1,800,000      
Saul Holdings Limited Partnership        
Significant Accounting Policies [Line Items]        
Percentage of ownership in operating partnership 74.30%