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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Scheduled Maturities of Debt, Including Scheduled Principal Amortization (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Outstanding line of credit	$ 26,000us-gaap_LineOfCredit	$ 43,000us-gaap_LineOfCredit
Balloon Payments
April 1 through December 31, 2015	0bfs_LongTermDebtMaturitiesBalloonPaymentsRemainderOfFiscalYear
2016	28,879bfs_LongTermDebtMaturitiesBalloonPaymentsInNextTwelveMonths
2017	0bfs_LongTermDebtMaturitiesBalloonPaymentsInYearTwo
2018	53,748bfs_LongTermDebtMaturitiesBalloonPaymentsInYearThree
2019	60,793bfs_LongTermDebtMaturitiesBalloonPaymentsinYearFour
2020	61,163bfs_LongTermDebtMaturitiesBalloonPaymentsInYearFive
Thereafter	387,704bfs_LongTermDebtMaturitiesBalloonPaymentsAfterYearFive
Balloon Payments, Total	592,287us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Scheduled Principal Amortization
April 1 through December 31, 2015	17,565us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2016	24,098us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2017	25,308us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2018	25,478us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2019	24,174us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2020	21,433us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter	122,508us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Principal Amortization, Total	260,564us-gaap_LongTermDebt
Total
April 1 through December 31, 2015	17,565bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsRemainderOfFiscalYear
2016	52,977bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsInNextTwelveMonths
2017	25,308bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsInYearTwo
2018	79,226bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsInYearThree
2019	84,967bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsInYearFour
2020	82,596bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsInYearFive
Thereafter	510,212bfs_LongTermDebtMaturitiesRepaymentsOfPrincipalAndBalloonPaymentsAfterYearFive
Total	852,851bfs_LongTermDebtRepaymentsOfPrincipalAndBalloonPayments
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding line of credit	$ 26,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember	$ 43,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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