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v2.4.1.9

Related Party Transactions - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2014 | Sep. 04, 2012
Related Party Transactions [Abstract] |  |  |  |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage | 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |  |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount | $ 103,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 91,300 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount |  |  |
Deferred compensation, employee contribution, percentage | 2.00%bfs_DeferredCompensationArrangementWithIndividualContributionsByPlanParticipantsPercentageOfSalaryMaximum |  |  |  |
Deferred compensation, company contribution, amount | 31,200 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | 36,900 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution |  |  |
Number of times the employer contribution is higher than the amount deferred by employees | 300.00%bfs_DeferredCompensationArrangementwithIndividualEmployerContributionPercentagetoEmployeeDeferrals |  |  |  |
Deferred compensation, cumulative unfunded liability | 1,600,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |  |  | 1,800,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |
Ancillary costs and expenses | 1,900,000 bfs_AncillaryCostsAndExpenses | 1,600,000 bfs_AncillaryCostsAndExpenses |  |  |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses | 431,900 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent |  |  | 543,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent |
Extended lease expiration period |  |  | 5 years |  |
Percentage of annual increase in base rent |  |  | 3.00%bfs_OperatingLeasesAnnualIncreaseInRentExpense |  |
Rent expense | 222,400 us-gaap_OperatingLeasesRentExpenseNet | 195,700 us-gaap_OperatingLeasesRentExpenseNet |  |  |
Insurance Commissions and fees expense | 83,000 us-gaap_OperatingInsuranceAndClaimsCostsProduction | 85,900 us-gaap_OperatingInsuranceAndClaimsCostsProduction |  |  |
Monthly consulting fees |  |  |  |  | 60,000 bfs_MonthlyConsultingFees
Consulting fees |  | $ 180,000 us-gaap_ProfessionalFees |  |  |

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- Definition Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum + References No definition available. + Details
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- Definition Deferred Compensation Arrangement with Individual, Employer Contribution, Percentage to Employee Deferrals + References No definition available. + Details
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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