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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 | $ 51,264 us-gaap_Revenues | $ 50,595 us-gaap_Revenues | $ 52,286 us-gaap_Revenues | $ 52,947 us-gaap_Revenues | $ 50,146 us-gaap_Revenues | $ 49,756 us-gaap_Revenues | $ 48,809 us-gaap_Revenues | $ 49,186 us-gaap_Revenues | $ 207,092 us-gaap_Revenues | $ 197,897 us-gaap_Revenues | $ 190,092 us-gaap_Revenues
Expenses |  |  |  |  |  |  |  |  | (49,513)us-gaap_CostOfRealEstateRevenue | (47,942)us-gaap_CostOfRealEstateRevenue | (47,270)us-gaap_CostOfRealEstateRevenue
Income from real estate |  |  |  |  |  |  |  |  | 157,579 us-gaap_GrossProfit | 149,955 us-gaap_GrossProfit | 142,822 us-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 |  |  |  |  |  |  |  |  | 94,584 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization | 88,415 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization | 79,004 bfs_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 | 36 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gain on sale of property |  |  |  |  |  |  |  |  | 6,069 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes | 0 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes | 0 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Gains on sales of properties | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 6,069 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 4,510 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (497)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on casualty settlement |  |  |  |  |  |  |  |  | 0 bfs_GainLossfromInsuranceSettlementandOther | 77 bfs_GainLossfromInsuranceSettlementandOther | 219 bfs_GainLossfromInsuranceSettlementandOther
Loss from operations of property sold |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (81)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Net Income |  |  |  |  |  |  |  |  | 57,988 us-gaap_ProfitLoss | 34,842 us-gaap_ProfitLoss | 39,780 us-gaap_ProfitLoss
Capital investment |  |  |  |  |  |  |  |  | 90,268 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 26,439 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 54,643 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets | 1,266,987 us-gaap_Assets |  |  |  | 1,198,675 us-gaap_Assets |  |  |  | 1,266,987 us-gaap_Assets | 1,198,675 us-gaap_Assets | 1,207,309 us-gaap_Assets
Shopping Centers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 154,385 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 145,219 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 137,647 us-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 |  |  |  |  |  |  |  |  | 120,604 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 114,490 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 107,508 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Interest expense and amortization of deferred debt costs |  |  |  |  |  |  |  |  | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
General and administrative |  |  |  |  |  |  |  |  | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Subtotal |  |  |  |  |  |  |  |  | 120,604 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 114,490 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 107,508 bfs_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 |  |  |  |  |  |  |  |  | 0 bfs_OtherOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 bfs_OtherOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 bfs_OtherOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Change in fair value of derivatives |  |  |  |  |  |  |  |  | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Gain on sale of property |  |  |  |  |  |  |  |  | 6,069 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember |  |
Gains on sales of properties |  |  |  |  |  |  |  |  |  |  | 4,510 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember |
Gain on casualty settlement |  |  |  |  |  |  |  |  |  | 77 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 219 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Loss from operations of property sold |  |  |  |  |  |  |  |  |  |  | (81)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Net Income |  |  |  |  |  |  |  |  | 97,642 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 87,121 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 85,360 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Capital investment |  |  |  |  |  |  |  |  | 66,508 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 18,232 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 46,353 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Total assets | 946,819 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember |  |  |  | 888,109 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember |  |  |  | 946,819 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 888,109 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember | 894,027 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_ShoppingCentersMember
Mixed-Use Properties |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 52,632 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 52,609 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 52,309 us-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 |  |  |  |  |  |  |  |  | 36,900 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 35,396 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 35,178 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Interest expense and amortization of deferred debt costs |  |  |  |  |  |  |  |  | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
General and administrative |  |  |  |  |  |  |  |  | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Subtotal |  |  |  |  |  |  |  |  | 36,900 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 35,396 bfs_SegmentReportingInformationOperatingIncomeLossBeforeDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 35,178 bfs_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 |  |  |  |  |  |  |  |  | 0 us-gaap_AcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-gaap_AcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-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 |  |  |  |  |  |  |  |  | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Gain on sale of property |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember |  |
Gains on sales of properties |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember |
Gain on casualty settlement |  |  |  |  |  |  |  |  |  | 0 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 0 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Loss from operations of property sold |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Net Income |  |  |  |  |  |  |  |  | 23,276 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 9,696 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 18,066 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Capital investment |  |  |  |  |  |  |  |  | 23,760 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 8,207 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 8,290 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Total assets | 307,901 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember |  |  |  | 293,512 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember |  |  |  | 307,901 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 293,512 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember | 301,355 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = bfs_MixedUsePropertiesMember
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 75 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 69 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 136 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Expenses |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfRealEstateRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_CostOfRealEstateRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_CostOfRealEstateRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Income from real estate |  |  |  |  |  |  |  |  | 75 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 69 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 136 us-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 |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Acquisition related costs |  |  |  |  |  |  |  |  | 0 us-gaap_AcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_AcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_AcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Predevelopment expenses |  |  |  |  |  |  |  |  | 0 bfs_OtherOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 bfs_OtherOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 bfs_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 | 36 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Gain on sale of property |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Gains on sales of properties |  |  |  |  |  |  |  |  |  |  | 0 us-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 |  |  |  |  |  |  |  |  |  | 0 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 bfs_GainLossfromInsuranceSettlementandOther / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Loss from operations of property sold |  |  |  |  |  |  |  |  |  |  | 0 us-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 |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Total assets | $ 12,267 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  | $ 17,054 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  | $ 12,267 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ 17,054 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ 11,927 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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- Definition Gain (Loss) from Insurance Settlement and Other + References No definition available. + Details
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- Definition Noncash Interest Expense Accretion And Amortization Of Deferred Finance Fees + References No definition available. + Details
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- Definition Segment Reporting Information, Operating Income (Loss) before Depreciation and Amortization + References No definition available. + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition This element represents the total of the costs related to real estate revenues, including management, leasing, and development services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Depreciation of property, plant and equipment directly related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Paragraph a -Subparagraph 1(ii) -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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