Derivative Instruments Loss Reclassified From Accumulated OCI Into Income Effective (yearly amount)

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- Definition

Maximum period of hedging exposure to the variability in future cash flows for forecasted transactions (in years)

+ References

No definition available.

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- Definition

Number of interest rate swap agreements entered into

+ References

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- Definition

Term of anticipated mortgage loan (in years)

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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- Definition

The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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- Definition

The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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- Definition

The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Derivative and Hedging Instruments (Details) $ in Thousands			12 Months Ended
Derivative and Hedging Instruments (Details) $ in Thousands	Aug. 17, 2016 USD ($)	Jan. 06, 2016 USD ($) swaps	Dec. 31, 2016 USD ($) yr swaps	Dec. 31, 2015 USD ($) yr	Dec. 31, 2014 USD ($)
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ (500)
Other liabilities			(106,022)	$ (34,005)	$ (57,873)
Losses from interest rate contracts			$ (140)	0	0
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 950,000
Boston Properties Limited Partnership \| Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swap agreements entered into \| swaps			17
Term of anticipated mortgage loan (in years) \| yr			10	10
Derivative, Average Fixed Interest Rate				2.423%
Derivative, Notional Amount				$ 550,000
Maximum period of hedging exposure to the variability in future cash flows for forecasted transactions (in years) \| yr			10
767 Fifth Partners LLC [Member]
Derivative [Line Items]
Ownership Percentage by Parent			60.00%
767 Fifth Partners LLC [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swap agreements entered into \| swaps		2	16
Term of anticipated mortgage loan (in years) \| yr			10
Derivative, Average Fixed Interest Rate			2.619%
Derivative, Notional Amount		$ 50,000	$ 450,000	400,000
Maximum period of hedging exposure to the variability in future cash flows for forecasted transactions (in years) \| yr			10
Derivative, Net Liability Position, Aggregate Fair Value			$ 8,700
Assets Needed for Immediate Settlement, Aggregate Fair Value			8,700
Derivative Instruments, Loss Recognized in Other Liabilities			8,800
Derivative Instruments, Gain Recognized in Prepaid Expenses and Other Assets			500
Boston Properties Limited Partnership
Derivative [Line Items]
Other liabilities			(106,022)	(34,005)	(57,873)
Losses from interest rate contracts			$ (140)	$ 0	$ 0
Boston Properties Limited Partnership \| Interest Rate Swap [Member]
Derivative [Line Items]
Other liabilities	$ 49,300
Losses from interest rate contracts	(100)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	49,200
Derivative instrument, yearly amount reclassed to interest expense	$ 4,900
Unsecured Senior Note 3.495% \| Senior Notes [Member] \| Boston Properties Limited Partnership
Derivative [Line Items]
Coupon/Stated Rate	2.75%		2.75%