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Real Estate Acquired and Sold - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 property | Apr. 30, 2014 sqft | Mar. 31, 2015 | Jan. 31, 2014 | Dec. 31, 2014 | Aug. 31, 2014 | Mar. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost | $ 68,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |
Property acquisition costs | 900,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts |  |  |  | 900,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts |  |
Number of properties purchased | 5 bfs_BusinessCombinationNumberofAcquisitions |  |  |  | 5 bfs_BusinessCombinationNumberofAcquisitions |  |
Olney Center |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Name of property |  | Olney Center |  |  |  |  |
Location of property |  | Olney, Maryland |  |  |  |  |
Proceeds from sale of real estate |  | 11,000,000 us-gaap_ProceedsFromSaleOfRealEstate / bfs_BusinessDispositionAxis = bfs_OlneyMember | 11,000,000 us-gaap_ProceedsFromSaleOfRealEstate / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |  |  |
Area of real estate property (in sq ft) |  | 53,765 us-gaap_AreaOfRealEstateProperty / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |  |  |  |
Lease term |  | P20Y |  |  |  |  |
Sale leaseback, option to purchase the property |  | 14,600,000 bfs_SaleLeasebackTransactionRepurchaseOptionAmount / bfs_BusinessDispositionAxis = bfs_OlneyMember | 14,600,000 bfs_SaleLeasebackTransactionRepurchaseOptionAmount / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |  |  |
Sales price of property |  |  | 11,000,000 us-gaap_SaleLeasebackTransactionHistoricalCost / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |  |  |
Annual increase in rental payments, percentage |  |  | 1.50%bfs_SaleLeasebackTransactionAnnualIncreaseinRentalPaymentsPercentage / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |  |  |
Giant Center |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Name of property |  | Giant Center |  |  |  |  |
Location of property |  | Milford Mill, Maryland |  |  |  |  |
Proceeds from sale of real estate |  | 7,500,000 us-gaap_ProceedsFromSaleOfRealEstate / bfs_BusinessDispositionAxis = bfs_GiantCenterMember |  |  |  |  |
Area of real estate property (in sq ft) |  | 70,040 us-gaap_AreaOfRealEstateProperty / bfs_BusinessDispositionAxis = bfs_GiantCenterMember |  |  |  |  |
Gain on sale of real estate |  | 6,100,000 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate / bfs_BusinessDispositionAxis = bfs_GiantCenterMember |  |  |  |  |
Assets held-for-sale |  |  |  |  |  |  | 500,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / bfs_BusinessDispositionAxis = bfs_GiantCenterMember
Liabilities of assets held-for-sale |  |  |  |  |  |  | 100,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / bfs_BusinessDispositionAxis = bfs_GiantCenterMember
1580 Rockville Pike |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost |  |  |  | 8,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |  |
Name of property |  |  |  | 1580 Rockville Pike |  |  |
Property acquisition costs |  |  |  | 163,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |  |
1582 Rockville Pike |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost |  | 11,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |  |  |  |
Name of property |  | 1582 Rockville Pike |  |  |  |  |
Property acquisition costs |  | 200,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |  |  |  |
Location of property |  | Rockville, Maryland |  |  |  |  |
1584 Rockville Pike |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | 6,200,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
Name of property |  |  |  |  | 1584 Rockville Pike |  |
Property acquisition costs | 200,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |  |  | 200,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
750 N. Glebe Road |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | 40,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |
Name of property |  |  |  |  |  | 750 N. Glebe Road |
Property acquisition costs |  | 355,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |  |  |  |  |
730 N. Glebe Road |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | 2,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |
Name of property |  |  |  |  | 730 N. Glebe Road |  |
Property acquisition costs | $ 40,400 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |  |  | $ 40,400 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |

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