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Summary of Significant Accounting Policies - Construction in Progress (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Construction in progress	$ 30,261us-gaap_DevelopmentInProcess	$ 9,867us-gaap_DevelopmentInProcess
Park Van Ness
Property, Plant and Equipment [Line Items]
Construction in progress	26,998us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_VanNessSquareMember	7,901us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_VanNessSquareMember
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 3,263us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = us-gaap_OtherPropertyMember	$ 1,966us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = us-gaap_OtherPropertyMember

X

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_DevelopmentInProcess
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bfs_VanNessSquareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=us-gaap_OtherPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: