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Unsecured Senior Notes Schedule of Unsecured Senior Notes (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Jan. 20, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Total |  | $ 6,255,602 |  |  | $ 5,264,819
Boston Properties Limited Partnership |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 6,255,602 |  |  | $ 5,264,819
Boston Properties Limited Partnership | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  | 6,300,000 |  |  |
Net unamortized discount |  | (13,148) |  |  |
Deferred Finance Costs, Net |  | (31,250) |  |  |
Total |  | $ 6,255,602 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 5.967% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 5.875% |  |  |
Effective Rate | [1] | 5.967% |  |  |
Principal Amount |  | $ 700,000 |  |  |
Maturity Date | [2] | Oct. 15, 2019 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 5.708% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 5.625% |  |  |
Effective Rate | [1] | 5.708% |  |  |
Principal Amount |  | $ 700,000 |  |  |
Maturity Date | [2] | Nov. 15, 2020 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 4.289% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 4.125% |  |  |
Effective Rate | [1] | 4.289% |  |  |
Principal Amount |  | $ 850,000 |  |  |
Maturity Date | [2] | May 15, 2021 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.853% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 3.70% |  |  |
Effective Rate | [1] | 3.853% |  |  |
Principal Amount |  | $ 850,000 |  |  |
Maturity Date | [2] | Nov. 15, 2018 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.954% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 3.85% |  |  |
Effective Rate | [1] | 3.954% |  |  |
Principal Amount |  | $ 1,000,000 |  |  |
Maturity Date | [2] | Feb. 01, 2023 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.279% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 3.125% |  |  |
Effective Rate | [1] | 3.279% |  |  |
Principal Amount |  | $ 500,000 |  |  |
Maturity Date | [2] | Sep. 01, 2023 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.916% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 3.80% |  |  |
Effective Rate | [1] | 3.916% |  |  |
Principal Amount |  | $ 700,000 |  |  |
Maturity Date | [2] | Feb. 01, 2024 |  |  |
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.766% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon/Stated Rate |  | 3.65% |  | 3.65% |
Effective Rate |  | 3.766% | [1] | 3.766% |
Principal Amount |  | $ 1,000,000 |  | $ 1,000,000 |
Maturity Date | [2] | Feb. 01, 2026 |  |  |
[1] | Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.
[2] | No principal amounts are due prior to maturity.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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