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Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Business Acquisition [Line Items] |  |  |
Land | $ 66,047 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand | $ 3,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand | $ 30,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Buildings | 4,873 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings | 2,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings | 3,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
Below Market Rents | (5,069)bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease |  | (700)bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease
Total Purchase Price | 67,950 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |
In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 2,099 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  | 500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |
1580 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land | 9,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |
Buildings | 2,200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |
Below Market Rents | (4,313)bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |
Total Purchase Price | 8,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember |  |
1580 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 513 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
1580 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |
1582 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land | 9,742 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |
Buildings | 828 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |
Below Market Rents | (419)bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |
Total Purchase Price | 11,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember |  |
1582 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 849 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
1582 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |
750 N. Glebe Road |  |  |
Business Acquisition [Line Items] |  |  |
Land | 38,224 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |  |
Buildings | 1,327 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |  |
Below Market Rents | 0 bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |  |
Total Purchase Price | 40,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember |  |
750 N. Glebe Road | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 449 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
750 N. Glebe Road | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |
730 N. Glebe Road |  |  |
Business Acquisition [Line Items] |  |  |
Land | 2,683 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |
Buildings | 78 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |
Below Market Rents | 0 bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |
Total Purchase Price | 2,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember |  |
730 N. Glebe Road | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 39 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
730 N. Glebe Road | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |
1584 Rockville Pike |  |  |
Business Acquisition [Line Items] |  |  |
Land | 5,798 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
Buildings | 440 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
Below Market Rents | (337)bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
Total Purchase Price | 6,150 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember |  |
1584 Rockville Pike | In-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 249 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember |  |
1584 Rockville Pike | Above Market Rents |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  |

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