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Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
tenant
store
Mar. 31, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]      
Number of tenants 1bfs_NumberOfTenants    
Number of shopping centers 31us-gaap_NumberOfStores    
Allowance for doubtful accounts receivables $ 800,000us-gaap_AllowanceForDoubtfulAccountsReceivable   $ 700,000us-gaap_AllowanceForDoubtfulAccountsReceivable
Period expected for the sale of property to occur 1 year    
Deferred debt costs, net 9,695,000us-gaap_DeferredFinanceCostsNet   9,874,000us-gaap_DeferredFinanceCostsNet
Accumulated amortization deferred leasing cost 6,000,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts   5,900,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Deferred leasing costs, net 26,737,000us-gaap_DeferredCostsLeasingNet   26,928,000us-gaap_DeferredCostsLeasingNet
Accumulated amortization deferred leasing cost 22,800,000us-gaap_DeferredCostsLeasingAccumulatedAmortization   21,600,000us-gaap_DeferredCostsLeasingAccumulatedAmortization
Amortization expense deferred leasing cost 1,400,000us-gaap_AmortizationOfDeferredLeasingFees 1,300,000us-gaap_AmortizationOfDeferredLeasingFees  
Interest expensed capitalized 340,000us-gaap_InterestCostsCapitalizedAdjustment 103,000us-gaap_InterestCostsCapitalizedAdjustment  
Commercial development projects, availability for occupancy, maximum period after major construction activity 1 year    
Depreciation and amortization expense 9,100,000us-gaap_DepreciationAndAmortization 8,900,000us-gaap_DepreciationAndAmortization  
Repairs and maintenance expense 3,700,000us-gaap_CostOfPropertyRepairsAndMaintenance 3,900,000us-gaap_CostOfPropertyRepairsAndMaintenance  
Shares credited to directors' deferred fee accounts 234,410us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued    
Percentage of ownership in Operating Partnership 74.30%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest    
Held-for-sale      
Significant Accounting Policies [Line Items]      
Number of real estate properties 0us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= bfs_PropertyHeldforsaleMember		    
Minimum      
Significant Accounting Policies [Line Items]      
Accounts receivable, net representing rental income accrued 39,500,000us-gaap_AccruedFeesAndOtherRevenueReceivable
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   38,700,000us-gaap_AccruedFeesAndOtherRevenueReceivable
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Allowance for doubtful accounts receivables representing rental income accrued $ 500,000us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   $ 300,000us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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    
Giant Food      
Significant Accounting Policies [Line Items]      
Percentage of total revenue 4.50%bfs_PercentageOfTotalRevenue
/ us-gaap_MajorCustomersAxis
= bfs_GiantFoodMember		    
Number of shopping centers 9bfs_NumberOfShoppingCenters
/ us-gaap_MajorCustomersAxis
= bfs_GiantFoodMember		    
Safeway      
Significant Accounting Policies [Line Items]      
Percentage of total revenue 2.70%bfs_PercentageOfTotalRevenue
/ us-gaap_MajorCustomersAxis
= bfs_SafewayMember		    
Number of shopping centers 8bfs_NumberOfShoppingCenters
/ us-gaap_MajorCustomersAxis
= bfs_SafewayMember		    
Revenues      
Significant Accounting Policies [Line Items]      
Number of tenants 2bfs_NumberOfTenants
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember		    
Percentage of total revenue 2.50%bfs_PercentageOfTotalRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember