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Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Revenue $ 51,264us-gaap_Revenues $ 50,595us-gaap_Revenues $ 52,286us-gaap_Revenues $ 52,947us-gaap_Revenues $ 50,146us-gaap_Revenues $ 49,756us-gaap_Revenues $ 48,809us-gaap_Revenues $ 49,186us-gaap_Revenues $ 207,092us-gaap_Revenues $ 197,897us-gaap_Revenues $ 190,092us-gaap_Revenues
Expenses                 (49,513)us-gaap_CostOfRealEstateRevenue (47,942)us-gaap_CostOfRealEstateRevenue (47,270)us-gaap_CostOfRealEstateRevenue
Income from real estate                 157,579us-gaap_GrossProfit 149,955us-gaap_GrossProfit 142,822us-gaap_GrossProfit
Interest expense and amortization of deferred debt costs                 (46,034)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees (46,589)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees (49,544)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
General and administrative                 (16,961)us-gaap_GeneralAndAdministrativeExpense (14,951)us-gaap_GeneralAndAdministrativeExpense (14,274)us-gaap_GeneralAndAdministrativeExpense
Subtotal                 94,584bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization 88,415bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization 79,004bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
Depreciation and amortization of deferred leasing costs                 (41,203)us-gaap_CostOfServicesDepreciationAndAmortization (49,130)us-gaap_CostOfServicesDepreciationAndAmortization (40,112)us-gaap_CostOfServicesDepreciationAndAmortization
Acquisition related costs                 (949)us-gaap_AcquisitionCosts (106)us-gaap_AcquisitionCosts (1,129)us-gaap_AcquisitionCosts
Predevelopment expenses                 (503)bfs_OtherOperatingExpenses (3,910)bfs_OtherOperatingExpenses (2,667)bfs_OtherOperatingExpenses
Change in fair value of derivatives                 (10)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet (7)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 36us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gain on sale of property                 6,069us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes 0us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes 0us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Gains on sales of properties 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 6,069us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax         0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 4,510us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Loss on early extinguishment of debt                 0us-gaap_GainsLossesOnExtinguishmentOfDebt (497)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on casualty settlement                 0bfs_GainLossfromInsuranceSettlementandOther 77bfs_GainLossfromInsuranceSettlementandOther 219bfs_GainLossfromInsuranceSettlementandOther
Loss from operations of property sold                 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (81)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Net Income                 57,988us-gaap_ProfitLoss 34,842us-gaap_ProfitLoss 39,780us-gaap_ProfitLoss
Capital investment                 90,268us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 26,439us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 54,643us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets 1,266,987us-gaap_Assets       1,198,675us-gaap_Assets       1,266,987us-gaap_Assets 1,198,675us-gaap_Assets 1,207,309us-gaap_Assets
Shopping Centers                      
Segment Reporting Information [Line Items]                      
Revenue                 154,385us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
145,219us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
137,647us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Expenses                 (33,781)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(30,729)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(30,139)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Income from real estate                 120,604us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
114,490us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
107,508us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Interest expense and amortization of deferred debt costs                 0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
General and administrative                 0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Subtotal                 120,604bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
114,490bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
107,508bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Depreciation and amortization of deferred leasing costs                 (28,082)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(27,340)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(25,667)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Acquisition related costs                 (949)us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(106)us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
(1,129)us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Predevelopment expenses                 0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Change in fair value of derivatives                 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Gain on sale of property                 6,069us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
   
Gains on sales of properties                     4,510us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Loss on early extinguishment of debt                   0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
 
Gain on casualty settlement                   77bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
219bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Loss from operations of property sold                     (81)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Net Income                 97,642us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
87,121us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
85,360us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Capital investment                 66,508us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
18,232us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
46,353us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Total assets 946,819us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
      888,109us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
      946,819us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
888,109us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
894,027us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_ShoppingCentersMember
Mixed-Use Properties                      
Segment Reporting Information [Line Items]                      
Revenue                 52,632us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
52,609us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
52,309us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Expenses                 (15,732)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(17,213)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(17,131)us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Income from real estate                 36,900us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
35,396us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
35,178us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Interest expense and amortization of deferred debt costs                 0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
General and administrative                 0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Subtotal                 36,900bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
35,396bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
35,178bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Depreciation and amortization of deferred leasing costs                 (13,121)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(21,790)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(14,445)us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Acquisition related costs                 0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Predevelopment expenses                 (503)bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(3,910)bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
(2,667)bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Change in fair value of derivatives                 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Gain on sale of property                 0us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
   
Gains on sales of properties                     0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Loss on early extinguishment of debt                   0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
 
Gain on casualty settlement                   0bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
0bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Loss from operations of property sold                     0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Net Income                 23,276us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
9,696us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
18,066us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Capital investment                 23,760us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
8,207us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
8,290us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Total assets 307,901us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
      293,512us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
      307,901us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
293,512us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
301,355us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bfs_MixedUsePropertiesMember
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Revenue                 75us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
69us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
136us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Expenses                 0us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_CostOfRealEstateRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Income from real estate                 75us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
69us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
136us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Interest expense and amortization of deferred debt costs                 (46,034)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(46,589)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(49,544)bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
General and administrative                 (16,961)us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(14,951)us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(14,274)us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Subtotal                 (62,920)bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(61,471)bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(63,682)bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Depreciation and amortization of deferred leasing costs                 0us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_CostOfServicesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Acquisition related costs                 0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_AcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Predevelopment expenses                 0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0bfs_OtherOperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Change in fair value of derivatives                 (10)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(7)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
36us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Gain on sale of property                 0us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
   
Gains on sales of properties                     0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Loss on early extinguishment of debt                   (497)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
 
Gain on casualty settlement                   0bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0bfs_GainLossfromInsuranceSettlementandOther
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Loss from operations of property sold                     0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Net Income                 (62,930)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(61,975)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(63,646)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Capital investment                 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Total assets $ 12,267us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
      $ 17,054us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
      $ 12,267us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 17,054us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 11,927us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember