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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2014 | Mar. 31, 2015 | Mar. 03, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Outstanding debt |  | $ 852,851,000 bfs_LongTermDebtRepaymentsOfPrincipalAndBalloonPayments |  |
Debt outstanding with fixed-rate |  | 797,400,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount |  | 784,800,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Debt outstanding with variable-rate |  | 55,500,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount |  | 72,600,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Carrying value of properties collateralizing mortgage notes |  | 873,100,000 us-gaap_RealEstateGrossAtCarryingValue |  | 895,500,000 us-gaap_RealEstateGrossAtCarryingValue
Revolving credit facility payable |  | 26,000,000 us-gaap_LineOfCredit |  | 43,000,000 us-gaap_LineOfCredit
Construction loan |  | 8,768,000 us-gaap_ConstructionLoan |  | 5,391,000 us-gaap_ConstructionLoan
Total outstanding debt |  |  |  | 857,400,000 us-gaap_SeniorNotes
Olney Center |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from sale of real estate | 11,000,000 us-gaap_ProceedsFromSaleOfRealEstate / bfs_BusinessDispositionAxis = bfs_OlneyMember | 11,000,000 us-gaap_ProceedsFromSaleOfRealEstate / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Sale-leaseback, monthly lease payments |  | 60,400 us-gaap_SaleLeasebackTransactionMonthlyRentalPayments / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Annual increase in rental payments, percentage |  | 1.50%bfs_SaleLeasebackTransactionAnnualIncreaseinRentalPaymentsPercentage / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Sale-leaseback, fixed interest rate |  | 8.00%us-gaap_SaleLeasebackTransactionImputedInterestRate / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Sales price of property |  | 11,000,000 us-gaap_SaleLeasebackTransactionHistoricalCost / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Sale leaseback, option to purchase the property | 14,600,000 bfs_SaleLeasebackTransactionRepurchaseOptionAmount / bfs_BusinessDispositionAxis = bfs_OlneyMember | 14,600,000 bfs_SaleLeasebackTransactionRepurchaseOptionAmount / bfs_BusinessDispositionAxis = bfs_OlneyMember |  |
Northrock Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Guarantor obligations, maximum exposure |  | 7,500,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember |  |
Northrock Loan | Variable Rate Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount outstanding |  | 14,500,000 us-gaap_LoansPayable / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember |  |
Metro Pike Center Bank Loan | Fixed Rate Mortgage Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Guarantor obligations, maximum exposure |  | 7,800,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember |  |
Metro Pike Center Bank Loan | Variable Rate Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount outstanding |  | 15,000,000 us-gaap_LoansPayable / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember |  |
Shops at Fairfax and Boulevard |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Construction-to-permanent loan |  |  | 30,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_ShopsatFairfaxandBoulevardMember |
Debt Instrument, Term |  |  | 15 years |
Debt Instrument, Maturity Date, Year |  |  | 2030 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.69%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_ShopsatFairfaxandBoulevardMember |
Shops at Fairfax and Boulevard | Fixed Rate Mortgage Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Periodic Payment |  |  | 153,300 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_ShopsatFairfaxandBoulevardMember |
Debt Instrument, Amortization Period |  |  | 25 years |
Debt Instrument, Final Payment Amount |  |  | 15,500,000 bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bfs_ShopsatFairfaxandBoulevardMember |
Van Ness Square |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Construction-to-permanent loan |  | 71,600,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bfs_VanNessSquareMember |  |
Construction loan |  | 8,800,000 us-gaap_ConstructionLoan / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bfs_VanNessSquareMember |  |
Unsecured Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 275,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember |  |
Line of credit facility maturity date |  | Jun. 23, 2018 |  |
Extension in line of credit facility period |  | 1 year |  |
Line of credit facility, maximum borrowing capacity |  | 248,600,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember |  |
Revolving credit facility payable |  | 26,000,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember |  | 43,000,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember
Description of variable rate basis |  | one-month LIBOR |  |
Unsecured Revolving Credit Facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread on LIBOR |  | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Unsecured Revolving Credit Facility | LIBOR | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread on LIBOR |  | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Unsecured Revolving Credit Facility | LIBOR | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread on LIBOR |  | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bfs_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 448,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |

X
- Definition Debt Instrument, Amortization Period + References No definition available. + Details
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- Definition Debt Instrument, Final Payment Amount + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Debt Instrument, Maturity Date, Year + References No definition available. + Details
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- Definition Line of Credit Facility Potential Term Extension Period + References No definition available. + Details
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Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-Term Debt, Repayments of Principal and Balloon Payments + References No definition available. + Details
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Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Sale Leaseback Transaction, Annual Increase in Rental Payments, Percentage + References No definition available. + Details
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Namespace Prefix: | bfs_
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- Definition Sale Leaseback Transaction, Repurchase Option, Amount + References No definition available. + Details
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X
- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + 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 210.7-03.16(a)(2)) -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 -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition The historical cost of the asset(s) sold in connection with the sale of the property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 + Details
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- Definition The financing cost related to leases that have been recorded under the deposit method, as a financing or as a capital leases in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Imputed Interest Rate -URI http://asc.fasb.org/extlink&oid=6515215 + Details
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- Definition The amount of the monthly rental payments due under the lease entered into in connection with the transactions involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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