XML 72 R51.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Long-Term Lease Obligations - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Feb. 28, 2022 USD ($) | Dec. 31, 2024 USD ($) property | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Leases Disclosure [Line Items] |  |  |  |
Rent expense |  | $ 847,600 | $ 871,300 | $ 824,300
Operating lease, right-of-use asset, statement of financial position | Total assets | Total assets |  |
Operating lease, liability, statement of financial position | Liabilities | Liabilities |  |
Lessor, operating lease, term of contract, additional extended period | 60 months |  |  |
Right-of-use asset | $ 3,800,000 | $ 1,700,000 |  |
Operating lease liability | $ 3,800,000 | $ 1,800,000 |  |
Flagship Center |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Number of developed parcels | property |  | 2 |  |
90-year Ground Leasehold Interest |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Ground leasehold interest period |  | 90 years |  |
Minimum annual lease rent over lease term |  | $ 1 |  |
99-year Ground Lease |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Ground leasehold interest period |  | 99 years |  |
Minimum annual lease rent over lease term |  | $ 1 |  |
Percent of underlying land held under a 99-year ground lease |  | 3.40% |  |

X
- Definition Annual Rental Payments Over Lease Term + References No definition available. + Details
Name: | bfs_AnnualRentalPaymentsOverLeaseTerm
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease Expiration Period + References No definition available. + Details
Name: | bfs_LeaseExpirationPeriod
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessor, Operating Lease, Term Of Contract, Additional Extended Period + References No definition available. + Details
Name: | bfs_LessorOperatingLeaseTermOfContractAdditionalExtendedPeriod
Namespace Prefix: | bfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Developed Parcels + References No definition available. + Details
Name: | bfs_NumberofDevelopedParcels
Namespace Prefix: | bfs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Lease Commitment + References No definition available. + Details
Name: | bfs_PercentageOfLeaseCommitment
Namespace Prefix: | bfs_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
Name: | us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bfs_FlagshipCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_CapitalizedCostByTypeAxis=bfs_NinetyYearGroundLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_CapitalizedCostByTypeAxis=bfs_NinetyNineYearGroundLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |