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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Debt Disclosure [Abstract] |  |
Interest incurred | $ 11,384 us-gaap_InterestExpenseDebt | $ 11,240 us-gaap_InterestExpenseDebt
Amortization of deferred debt costs | 362 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 330 us-gaap_AmortizationOfFinancingCostsAndDiscounts
Capitalized interest | (340)us-gaap_InterestCostsCapitalizedAdjustment | (103)us-gaap_InterestCostsCapitalizedAdjustment
Interest expense and amortization of deferred debt costs | $ 11,406 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees | $ 11,467 bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees

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- Definition Noncash Interest Expense Accretion And Amortization Of Deferred Finance Fees + References No definition available. + Details
Name: | bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_AmortizationOfFinancingCostsAndDiscounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. + References No definition available. + Details
Name: | us-gaap_InterestCostsCapitalizedAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_InterestExpenseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration