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

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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