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Real Estate Acquired - Amortization of Intangible Assets and Deferred Income Related to in Place Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Below market leases  
2015 $ 1,787us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths
2016 1,722us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo
2017 1,701us-gaap_BelowMarketLeaseAmortizationIncomeYearThree
2018 1,617us-gaap_BelowMarketLeaseAmortizationIncomeYearFour
2019 1,473us-gaap_BelowMarketLeaseAmortizationIncomeYearFive
Thereafter 9,670us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive
Total 17,970us-gaap_BelowMarketLeaseNet
Lease Acquisition Costs  
Finite-Lived Intangible Assets [Line Items]  
2015 1,252us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
2016 988us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
2017 796us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
2018 737us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
2019 550us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
Thereafter 1,739us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
Total 6,062us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bfs_AcquisitionCostsMember
Above Market Leases  
Finite-Lived Intangible Assets [Line Items]  
2015 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
2016 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
2017 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
2018 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
2019 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Total $ 5us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember