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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
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Below market leases |
2015 | $ 1,787 us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths
2016 | 1,722 us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo
2017 | 1,701 us-gaap_BelowMarketLeaseAmortizationIncomeYearThree
2018 | 1,617 us-gaap_BelowMarketLeaseAmortizationIncomeYearFour
2019 | 1,473 us-gaap_BelowMarketLeaseAmortizationIncomeYearFive
Thereafter | 9,670 us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive
Total | 17,970 us-gaap_BelowMarketLeaseNet
Lease Acquisition Costs |
Finite-Lived Intangible Assets [Line Items] |
2015 | 1,252 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
2016 | 988 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
2017 | 796 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
2018 | 737 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
2019 | 550 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
Thereafter | 1,739 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
Total | 6,062 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bfs_AcquisitionCostsMember
Above Market Leases |
Finite-Lived Intangible Assets [Line Items] |
2015 | 2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
2016 | 1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
2017 | 1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
2018 | 1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
2019 | 0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Thereafter | 0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Total | $ 5 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember

X
- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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