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Summary of Significant Accounting Policies - Construction in Progress (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Property, Plant and Equipment [Line Items] |  |
Construction in progress | $ 39,301 us-gaap_DevelopmentInProcess | $ 30,261 us-gaap_DevelopmentInProcess
Park Van Ness |  |
Property, Plant and Equipment [Line Items] |  |
Construction in progress | 35,458 us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_VanNessSquareMember | 26,998 us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_VanNessSquareMember
Other |  |
Property, Plant and Equipment [Line Items] |  |
Construction in progress | $ 3,843 us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = us-gaap_OtherPropertyMember | $ 3,263 us-gaap_DevelopmentInProcess / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = us-gaap_OtherPropertyMember

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Phase -URI http://asc.fasb.org/extlink&oid=49177889 + Details
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- Details
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