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Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) (Noncontrolling Interest) | 3 Months Ended
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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 | 7,200,000 us-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 | 800,000 bfs_LimitedPartnersCapitalAccountConvertibleUnitsEligibleForConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Fully converted partnership units and diluted weighted average shares outstanding | 28,300,000 bfs_PartnersCapitalAccountUnitsConvertedAndWeightedAverageSharesOutstandingDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 27,700,000 bfs_PartnersCapitalAccountUnitsConvertedAndWeightedAverageSharesOutstandingDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember

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- Definition Limited Partners' Capital Account, Convertible Units, Conversion Ratio + References No definition available. + Details
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- Definition Limited Partners' Capital Account, Convertible Units, Eligible for Conversion + References No definition available. + Details
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- Definition Minimum Outstanding Stock Percentage That Should be Acquired for Rights Issued to Become Exercisable + References No definition available. + Details
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- Definition Partners' Capital Account, Units, Converted and Weighted Average Shares Outstanding, Diluted + References No definition available. + Details
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- 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 + Details
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- Details
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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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