Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue
Base rent	$ 490,682	$ 455,018
Recoveries from tenants	88,593us-gaap_TenantReimbursements	81,934us-gaap_TenantReimbursements
Parking and other	24,788us-gaap_ParkingRevenue	24,333us-gaap_ParkingRevenue
Total rental revenue	604,063us-gaap_RealEstateRevenueNet	561,285us-gaap_RealEstateRevenueNet
Hotel revenue	9,085us-gaap_RevenueFromLeasedAndOwnedHotels	8,193us-gaap_RevenueFromLeasedAndOwnedHotels
Development and management services	5,328bxp_DevelopmentAndManagementServices	5,216bxp_DevelopmentAndManagementServices
Total revenue	618,476us-gaap_Revenues	574,694us-gaap_Revenues
Expenses
Rental	221,350	206,388
Hotel	7,576us-gaap_DirectCostsOfHotels	6,797us-gaap_DirectCostsOfHotels
General and administrative	28,791us-gaap_GeneralAndAdministrativeExpense	29,905us-gaap_GeneralAndAdministrativeExpense
Transaction costs	327bxp_TransactionCostsExpensed	437bxp_TransactionCostsExpensed
Depreciation and amortization	154,223us-gaap_DepreciationAndAmortization	154,270us-gaap_DepreciationAndAmortization
Total expenses	412,267us-gaap_CostsAndExpenses	397,797us-gaap_CostsAndExpenses
Operating income	206,209us-gaap_OperatingIncomeLoss	176,897us-gaap_OperatingIncomeLoss
Other income (expense)
Income from unconsolidated joint ventures	14,834	2,816
Interest and other income	1,407us-gaap_InterestAndOtherIncome	1,311us-gaap_InterestAndOtherIncome
Gains from investments in securities	393us-gaap_GainLossOnInvestments	286us-gaap_GainLossOnInvestments
Interest expense	(108,757)us-gaap_InterestExpense	(113,554)us-gaap_InterestExpense
Income before gains on sales of real estate	114,086	67,756
Gains on sales of real estate	95,084	0
Net income	209,170us-gaap_ProfitLoss	67,756us-gaap_ProfitLoss
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(15,208)	(4,354)
Noncontrolling interest - redeemable preferred units of the Operating Partnership	(3)	(619)
Noncontrolling interest - common units of the Operating Partnership	(20,188)	(6,160)
Net income attributable to Boston Properties, Inc.	173,771us-gaap_NetIncomeLoss	56,623us-gaap_NetIncomeLoss
Preferred dividends	(2,589)	(2,589)
Net income attributable to Boston Properties, Inc. common shareholders	$ 171,182	$ 54,034
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income (in dollars per share)	$ 1.12us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic
Weighted average number of common shares outstanding (in shares)	153,230	153,030
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Diluted Earnings: Net income, Per Share Amount (in dollars per share)	$ 1.11us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted
Weighted average number of common and common equivalent shares outstanding (in shares)	153,873	153,169

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