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Distributions - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 30, 2015	Jan. 15, 2015	Jan. 07, 2015
Dividends [Line Items]
Common stock issued, discount rate		3.00%bfs_PercentageOfDiscountOnCommonStock
Common stock distributions (in usd per share)		$ 1.56us-gaap_CommonStockDividendsPerShareCashPaid	$ 1.44us-gaap_CommonStockDividendsPerShareCashPaid	$ 1.44us-gaap_CommonStockDividendsPerShareCashPaid
Dividends declared per common share outstanding (in usd per share)	$ 0.40us-gaap_CommonStockDividendsPerShareDeclared
Distribution to limited partnership unitholders		$ 11,117bfs_DistributionsToNoncontrollingInterest	$ 9,956bfs_DistributionsToNoncontrollingInterest	$ 9,955bfs_DistributionsToNoncontrollingInterest
Subsequent Event
Dividends [Line Items]
Common stock dividend paid					8,400us-gaap_DividendsCommonStockCash / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Distribution to limited partnership unitholders					2,900bfs_DistributionsToNoncontrollingInterest / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Distribution to limited partnership unitholders (in usd per share)					$ 0.40us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividend Income
Dividends [Line Items]
Common stock distributions (in usd per share)		$ 1.56us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = bfs_OrdinaryDividendIncomeMember	$ 0.96us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = bfs_OrdinaryDividendIncomeMember	$ 0.95us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = bfs_OrdinaryDividendIncomeMember
Return on Invested Capital
Dividends [Line Items]
Common stock distributions (in usd per share)			$ 0.48us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = bfs_ReturnOnInvestedCapitalMember	$ 0.49us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = bfs_ReturnOnInvestedCapitalMember
Series A Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)		$ 2.41us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember	$ 2us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember	$ 2.00us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)			$ 0.99us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	$ 2.25us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series C Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)		$ 1.72us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember	$ 1.09us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series C Preferred Stock | Subsequent Event
Dividends [Line Items]
Dividends declared per preferred share outstanding (in usd per share)							$ 0.4296875us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Preferred stock distributions						$ 3,100us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock
Dividends [Line Items]
Dividends record date	Jan. 16, 2015

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