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

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-Publisher FASB

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