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Fair Value of Financial Instruments - Changes in Fair Value of Swaps (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Increase (decrease) in fair value:
Recognized in earnings	$ (10)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ (7)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ 36us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Recognized in other comprehensive income	(675)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2,897us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(932)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Total	$ (685)bfs_IncreaseDecreaseInFairValueOfInterestRateSwapsNet	$ 2,890bfs_IncreaseDecreaseInFairValueOfInterestRateSwapsNet	$ (896)bfs_IncreaseDecreaseInFairValueOfInterestRateSwapsNet

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Increase / (decrease) in fair value of interest rate swaps, net.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580



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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993



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