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Stock Option and Incentive Plan Schedule of Stock Options Outstanding (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number Outstanding at 12/31/14 553,312us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 558,823us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 294,527us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 155,623us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding, Weighted Average Exercise Price $ 97.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 100.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 101.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 89.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Number Exercisable at 12/31/2014   199,868us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 91,496us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Exercisable, Weighted Average Exercise Price   $ 98.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 98.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Exercise Price of $87.70 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Weighted Average Remaining Contractual Life (Years) 3 years 7 months 6 days      
Number Outstanding at 12/31/14 124,513us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofEightySevendollarsandseventycentsMember		      
Outstanding, Weighted Average Exercise Price $ 87.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofEightySevendollarsandseventycentsMember		      
Number Exercisable at 12/31/2014 111,832us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofEightySevendollarsandseventycentsMember		      
Exercisable, Weighted Average Exercise Price $ 87.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofEightySevendollarsandseventycentsMember		      
Exercise Price of $96.62 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Weighted Average Remaining Contractual Life (Years) 8 years 3 months 18 days      
Number Outstanding at 12/31/14 53,759us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetySixdollarsandSixtyTwocentsMember		      
Outstanding, Weighted Average Exercise Price $ 96.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetySixdollarsandSixtyTwocentsMember		      
Number Exercisable at 12/31/2014 13,439us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetySixdollarsandSixtyTwocentsMember		      
Exercisable, Weighted Average Exercise Price $ 96.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetySixdollarsandSixtyTwocentsMember		      
Exercise Price of $99.41 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Weighted Average Remaining Contractual Life (Years) 4 years 10 months 24 days      
Number Outstanding at 12/31/14 207,064us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetyNineDollarsandFortyOnecentsMember		      
Outstanding, Weighted Average Exercise Price $ 99.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetyNineDollarsandFortyOnecentsMember		      
Number Exercisable at 12/31/2014 150,024us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetyNineDollarsandFortyOnecentsMember		      
Exercisable, Weighted Average Exercise Price $ 99.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofNinetyNineDollarsandFortyOnecentsMember		      
Exercise Price of $101.75 Cents [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Weighted Average Remaining Contractual Life (Years) 4 years 4 months 24 days      
Number Outstanding at 12/31/14 167,976us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofOneHundredandOneDollarsandSeventyFiveCentsMember		      
Outstanding, Weighted Average Exercise Price $ 101.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofOneHundredandOneDollarsandSeventyFiveCentsMember		      
Number Exercisable at 12/31/2014 135,848us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofOneHundredandOneDollarsandSeventyFiveCentsMember		      
Exercisable, Weighted Average Exercise Price $ 101.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxp_ExercisePriceofOneHundredandOneDollarsandSeventyFiveCentsMember