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Stockholders' Equity and Noncontrolling Interest - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 | Nov. 30, 2003 | Mar. 31, 2008 | Nov. 12, 2014 | Feb. 12, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests | $ 11,045 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 3,970 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 6,406 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold |  |  |  |  | 4,000,000 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  |  |  | 0.01 bfs_DepositorySharesToRedeemablePreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Dividend rate on preferred stock |  |  |  |  | 8.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Depositary shares, redeemable price (in usd per share) |  |  |  |  | $ 25.00 bfs_DepositorySharesRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Annual dividend on depositary shares |  |  |  |  | $ 2.00 bfs_DepositorySharesDividendsPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Cumulative redeemable preferred stock liquidation preference |  |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Percentage of redeemable preferred stock |  |  |  | 60.00%bfs_PreferredStockRedemptionPercentageOfOriginallyIssuedShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold |  |  |  |  |  | 3,173,115 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  |  |  |  | 0.01 bfs_DepositorySharesToRedeemablePreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Dividend rate on preferred stock |  |  |  |  |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Depositary shares, redeemable price (in usd per share) |  |  |  |  |  | $ 25.00 bfs_DepositorySharesRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Annual dividend on depositary shares |  |  |  |  |  | $ 2.25 bfs_DepositorySharesDividendsPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Cumulative redeemable preferred stock liquidation preference |  |  |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Series B Preferred Stock | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Depository shares redemption date |  |  |  |  |  | Mar. 15, 2013 |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold |  |  |  |  |  |  | 1,600,000 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 5,600,000 bfs_DepositarySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Depository shares to cumulative redeemable preferred stock ratio |  |  |  |  |  |  |  | 0.01 bfs_DepositorySharesToRedeemablePreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Dividend rate on preferred stock |  |  |  |  |  |  |  | 6.875%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Annual dividend on depositary shares |  |  |  |  |  |  |  | $ 1.71875 bfs_DepositorySharesDividendsPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Cumulative redeemable preferred stock liquidation preference |  |  |  |  |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Percentage of redeemable preferred stock |  |  |  |  |  |  |  | 6.875%bfs_PreferredStockRedemptionPercentageOfOriginallyIssuedShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series C preferred stock | $ 39,260 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 135,221 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 0 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | $ 39,260 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 135,200 bfs_NetProceedsFromSharesSold / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Dividends payment date |  |  |  |  |  |  |  | Apr. 15, 2013
Series C Preferred Stock | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Depository shares redemption date |  |  |  |  |  |  |  | Feb. 12, 2018
Dividends record date |  |  |  |  |  |  |  | Feb. 12, 2013
Series C Preferred Stock | Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends record date |  |  |  |  |  |  |  | Mar. 31, 2013

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