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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Interest incurred $ 45,396,000us-gaap_InterestExpenseDebt $ 45,502,000us-gaap_InterestExpenseDebt $ 48,010,000us-gaap_InterestExpenseDebt
Amortization of deferred debt costs 1,327,000us-gaap_AmortizationOfFinancingCostsAndDiscounts 1,257,000us-gaap_AmortizationOfFinancingCostsAndDiscounts 1,576,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
Capitalized interest (689,000)us-gaap_InterestCostsCapitalizedAdjustment (170,000)us-gaap_InterestCostsCapitalizedAdjustment (42,300)us-gaap_InterestCostsCapitalizedAdjustment
Total $ 46,034,000bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees $ 46,589,000bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees $ 49,544,000bfs_NoncashInterestExpenseAccretionAndAmortizationOfDeferredFinanceFees