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Organization, Formation And Basis of Presentation - Additional Information (Detail)
Dec. 31, 2014
partnership
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]  
Distribution of REIT taxable income (excluding net capital gains) to its stockholders 90.00%bfs_MinimumPercentageOfTaxableIncomeDistributionToShareholders
Number of partnerships 2bfs_NumberofPartnerships
Shopping Centers  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]  
Number of real estate properties 50us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= bfs_ShoppingCentersMember
Mixed-Use Properties  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]  
Number of real estate properties 6us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= bfs_MixedUsePropertiesMember
Non-operating Development Properties  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]  
Number of real estate properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= bfs_NonoperatingDevelopmentPropertiesMember