Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 209,170us-gaap_ProfitLoss	$ 67,756us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	154,223	154,270
Non-cash compensation expense	11,011us-gaap_ShareBasedCompensation	10,380us-gaap_ShareBasedCompensation
Income from unconsolidated joint ventures	(14,834)	(2,816)
Distributions of net cash flow from operations of unconsolidated joint ventures	1,350	1,431
Gains from investments in securities	(393)us-gaap_GainLossOnSaleOfInvestments	(286)us-gaap_GainLossOnSaleOfInvestments
Non-cash portion of interest expense	(10,884)us-gaap_PaidInKindInterest	(7,676)us-gaap_PaidInKindInterest
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes	0	(92,979)
Gains on sales of real estate	(95,084)us-gaap_GainLossOnSaleOfProperties	0us-gaap_GainLossOnSaleOfProperties
Change in assets and liabilities:
Cash held in escrows	1,044	2,961
Tenant and other receivables, net	(1,173)	21,652
Accrued rental income, net	(23,250)us-gaap_StraightLineRent	(10,127)us-gaap_StraightLineRent
Prepaid expenses and other assets	3,447	5,989
Accounts payable and accrued expenses	(5,535)	1,288
Accrued interest payable	23,098	11,128
Other liabilities	(23,136)	(22,197)
Tenant leasing costs	(27,608)bxp_TenantLeasingCosts	(16,565)bxp_TenantLeasingCosts
Total adjustments	(7,724)	56,453
Net cash provided by operating activities	201,446	124,209
Cash flows from investing activities:
Construction in progress	(60,013)us-gaap_ConstructionAndDevelopmentCosts	(97,025)us-gaap_ConstructionAndDevelopmentCosts
Building and other capital improvements	(19,391)us-gaap_PaymentsForCapitalImprovements	(17,510)us-gaap_PaymentsForCapitalImprovements
Tenant improvements	(26,950)us-gaap_PaymentsForTenantImprovements	(31,551)us-gaap_PaymentsForTenantImprovements
Proceeds from the sales of real estate	194,821	0
Proceeds from sales of real estate placed in escrow	(201,857)us-gaap_IncreaseInRestrictedCash	0us-gaap_IncreaseInRestrictedCash
Proceeds from sales of real estate released from escrow	99,916us-gaap_DecreaseInRestrictedCash	0us-gaap_DecreaseInRestrictedCash
Deposits on real estate	(5,000)	0
Capital contributions to unconsolidated joint ventures	(2,444)	0
Capital distributions from unconsolidated joint ventures	24,527	113
Investments in securities, net	(884)	(1,099)
Net cash provided by (used in) investing activities	2,725	(147,072)
Cash flows from financing activities:
Repayments of mortgage notes payable	(7,024)us-gaap_RepaymentsOfSecuredDebt	(6,630)us-gaap_RepaymentsOfSecuredDebt
Redemption/repurchase of unsecured exchangeable senior notes	0us-gaap_RepaymentsOfConvertibleDebt	(654,521)us-gaap_RepaymentsOfConvertibleDebt
Proceeds from real estate financing transaction	6,000bxp_Proceedsfromrealestatetransaction	0bxp_Proceedsfromrealestatetransaction
Payments on real estate financing transaction	(636)bxp_Paymentsonrealestatetransaction	0bxp_Paymentsonrealestatetransaction
Deferred financing costs	(20)us-gaap_PaymentsOfFinancingCosts	(18)us-gaap_PaymentsOfFinancingCosts
Net proceeds from equity transactions	(145)	(527)
Dividends and distributions	(883,684)us-gaap_PaymentsOfDividends	(496,330)us-gaap_PaymentsOfDividends
Contributions from noncontrolling interest in property partnerships	629	468
Distributions to noncontrolling interest in property partnerships	(17,974)us-gaap_PaymentsToMinorityShareholders	(5,143)us-gaap_PaymentsToMinorityShareholders
Net cash used in financing activities	(902,854)	(1,162,701)
Net decrease in cash and cash equivalents	(698,683)	(1,185,564)
Cash and cash equivalents, beginning of period	1,763,079	2,365,137
Cash and cash equivalents, end of period	1,064,396	1,179,573
Supplemental disclosures:
Cash paid for interest	104,508us-gaap_InterestPaid	220,790us-gaap_InterestPaid
Interest capitalized	7,965us-gaap_InterestCostsCapitalized	17,709us-gaap_InterestCostsCapitalized
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	9,243	9,393
Dividends and distributions declared but not paid	112,796	114,799
Conversions of noncontrolling interests to stockholders' equity	8,689	627
Issuance of restricted securities to employees and directors	$ 42,279	$ 26,534

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Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

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No definition available.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Amount of cash inflow (outflow) from (to) a noncontrolling interest. Excludes dividends paid to the noncontrolling interest.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Difference between actual rental income due and rental income recognized on a straight-line basis.

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