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Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) (Noncontrolling Interest)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.70%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Limited partnership units	7,200,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Limited partnership units, conversion ratio	100.00%bfs_LimitedPartnersCapitalAccountConvertibleUnitsConversionRatio / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Outstanding stock percent that should be acquired for rights to be exercised	39.90%bfs_MinimumOutstandingStockPercentageThatShouldBeAcquiredForRightsIssuedToBecomeExercisable / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Limited partnership units convertible in to shares of common stock, eligible for conversion	800,000bfs_LimitedPartnersCapitalAccountConvertibleUnitsEligibleForConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Fully converted partnership units and diluted weighted average shares outstanding	28,300,000bfs_PartnersCapitalAccountUnitsConvertedAndWeightedAverageSharesOutstandingDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember	27,700,000bfs_PartnersCapitalAccountUnitsConvertedAndWeightedAverageSharesOutstandingDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember

X

- Definition

Limited Partners' Capital Account, Convertible Units, Conversion Ratio

+ References

No definition available.

+ Details

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X

- Definition

Limited Partners' Capital Account, Convertible Units, Eligible for Conversion

+ References

No definition available.

+ Details

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X

- Definition

Minimum Outstanding Stock Percentage That Should be Acquired for Rights Issued to Become Exercisable

+ References

No definition available.

+ Details

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X

- Definition

Partners' Capital Account, Units, Converted and Weighted Average Shares Outstanding, Diluted

+ References

No definition available.

+ Details

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Namespace Prefix:	bfs_
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X

- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

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X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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