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Stockholders' Equity and Noncontrolling Interests - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Feb. 12, 2013 | Nov. 12, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |
Income attributable to noncontrolling interests | $ 2,474,000 us-gaap_IncomeLossAttributableToNoncontrollingInterest | $ 2,424,000 us-gaap_IncomeLossAttributableToNoncontrollingInterest |  |  |
6.875 Series C Cumulative Redeemable Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of depositary shares sold |  |  | 5.6 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00%bfs_DepositorySharesToRedeemablePreferredStockRatio / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Percentage of redeemable preferred stock |  |  | 6.875%bfs_PreferredStockRedemptionPercentageOfOriginallyIssuedShares / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Cash proceeds from sale depositary shares |  |  | 135,200,000 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Dividend payment accrual date |  |  | Feb. 12, 2018 |  |
Cumulative redeemable preferred stock liquidation preference (in usd per share) |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Annual dividend on depositary shares (in usd per share) |  |  | $ 1.71875 bfs_DepositorySharesDividendsPerShare / us-gaap_StatementClassOfStockAxis = bfs_SeriesCCumulativePreferredStockMember |  |
Series C Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of depositary shares sold |  |  |  | 1.6 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Percentage of redeemable preferred stock |  |  | 6.875%bfs_PreferredStockRedemptionPercentageOfOriginallyIssuedShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
Cash proceeds from sale depositary shares |  |  |  | $ 39,300,000 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Series A Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividend rate on preferred stock |  |  |  |  | 8.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember

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- Definition Amount of Income (Loss) attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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