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Related Party Transactions - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
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 $ 379,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 369,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 379,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount  
Deferred compensation, employee contribution, percentage 2.00%bfs_DeferredCompensationArrangementWithIndividualContributionsByPlanParticipantsPercentageOfSalaryMaximum      
Deferred compensation, employer contribution, percentage 3bfs_DeferredCompensationArrangementwithIndividualEmployerContributionPercentageDeferredCompensation 3bfs_DeferredCompensationArrangementwithIndividualEmployerContributionPercentageDeferredCompensation 3bfs_DeferredCompensationArrangementwithIndividualEmployerContributionPercentageDeferredCompensation  
Deferred compensation, company contribution, amount 192,800us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution 191,300us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution 238,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution  
Deferred compensation, cumulative unfunded liability 1,800,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability 1,600,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability    
Ancillary costs and expenses 7,400,000bfs_AncillaryCostsAndExpenses 6,300,000bfs_AncillaryCostsAndExpenses 6,000,000bfs_AncillaryCostsAndExpenses  
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses 543,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent 499,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent    
Insurance commissions and fees expense 427,300us-gaap_OperatingInsuranceAndClaimsCostsProduction 447,300us-gaap_OperatingInsuranceAndClaimsCostsProduction 372,000us-gaap_OperatingInsuranceAndClaimsCostsProduction  
Monthly consulting fees       60,000bfs_MonthlyConsultingFees
Consulting fees $ 495,000us-gaap_ProfessionalFees $ 720,000us-gaap_ProfessionalFees $ 225,000us-gaap_ProfessionalFees