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Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Dividends [Line Items] |  |  |
Preferred Stockholders | $ 13,474 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | $ 14,561 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | $ 15,140 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Common Stockholders | 32,346 us-gaap_PaymentsOfDividendsCommonStock | 29,205 us-gaap_PaymentsOfDividendsCommonStock | 28,135 us-gaap_PaymentsOfDividendsCommonStock
Limited Partnership Unitholders | 11,117 bfs_DividendsPaidToNoncontrollingInterests | 9,956 bfs_DividendsPaidToNoncontrollingInterests | 9,956 bfs_DividendsPaidToNoncontrollingInterests
Dividend Reinvestments, Common Stock Issued (in shares) | 197,638 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 475,162 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 595,388 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 196,183 bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan | 88,309 bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan |
October 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,856 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 3,206 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 3,785 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember
Common Stockholders | 8,348 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 7,388 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 7,120 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember
Limited Partnership Unitholders | 2,879 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember
Dividend Reinvestments, Common Stock Issued (in shares) | 40,142 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 48,836 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | 141,960 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 52.71 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | $ 46.27 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember | $ 42.23 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  | 88,309 bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember |
Dividend Reinvestments, Average Unit Price (in usd per share) |  | $ 46.93 bfs_LimitedPartnersDividendReinvestmentPlanAverageUnitPrice / us-gaap_DividendsAxis = bfs_DividendPaymentOneMember |
July 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,206 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 3,206 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 3,785 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember
Common Stockholders | 8,314 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 7,327 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 7,063 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember
Limited Partnership Unitholders | 2,879 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember
Dividend Reinvestments, Common Stock Issued (in shares) | 57,696 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 138,019 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | 144,881 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 46.79 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | $ 45.21 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember | $ 40.43 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentTwoMember
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  |  |
April 30 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,206 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 4,364 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 3,785 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember
Common Stockholders | 8,269 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 7,272 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 7,005 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember
Limited Partnership Unitholders | 2,838 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember
Dividend Reinvestments, Common Stock Issued (in shares) | 60,212 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 142,839 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | 145,118 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 44.14 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | $ 42.85 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember | $ 38.93 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 104,831 bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember |  |
Dividend Reinvestments, Average Unit Price (in usd per share) | $ 44.77 bfs_LimitedPartnersDividendReinvestmentPlanAverageUnitPrice / us-gaap_DividendsAxis = bfs_DividendPaymentThreeMember |  |
January 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,206 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 3,785 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 3,785 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember
Common Stockholders | 7,415 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 7,218 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 6,947 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember
Limited Partnership Unitholders | $ 2,521 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | $ 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | $ 2,489 bfs_DividendsPaidToNoncontrollingInterests / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember
Dividend Reinvestments, Common Stock Issued (in shares) | 39,588 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 145,468 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | 163,429 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 45.15 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | $ 41.67 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember | $ 34.44 bfs_DividendsReinvestedInCommonStockPricePerShare / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 91,352 bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember |  |
Dividend Reinvestments, Average Unit Price (in usd per share) | $ 45.80 bfs_LimitedPartnersDividendReinvestmentPlanAverageUnitPrice / us-gaap_DividendsAxis = bfs_DividendPaymentFourMember |  |

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