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Stockholders' Equity / Partners' Capital Stockholders Equity / Partners Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
Class of Stock [Line Items] |
Dividends Declared [Table Text Block] | The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid or payable in 2017:
Record Date |  | Payment Date |  | Dividend (Per Share) |  |  | Distribution (Per Unit) |
December 29, 2017 |  | January 30, 2018 |  |  | $0.80 |  |  |  | $0.80 |
September 29, 2017 |  | October 31, 2017 |  | 0.75 |  |  | 0.75 |
June 30, 2017 |  | July 31, 2017 |  | 0.75 |  |  | 0.75 |
March 31, 2017 |  | April 28, 2017 |  | 0.75 |  |  | 0.75 |
December 31, 2016 |  | January 30, 2017 |  | 0.75 |  |  | 0.75 |
Schedule Of Changes In Partners Capital Unit [Table Text Block] | The following table presents the changes in the issued and outstanding partners’ capital units since January 1, 2015:
|  | General Partner Units |  | Limited Partner Units |  | Total Partners’ Capital Units
Outstanding at December 31, 2014 |  | 1,710,644 |  |  | 151,403,301 |  |  | 153,113,945 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan |  | 59 |  |  | 6,140 |  |  | 6,199 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan, net |  | 340 |  |  | 35,246 |  |  | 35,586 |
Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units |  | 4,049 |  |  | 420,187 |  |  | 424,236 |
Outstanding at December 31, 2015 |  | 1,715,092 |  |  | 151,864,874 |  |  | 153,579,966 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan |  | 72 |  |  | 5,623 |  |  | 5,695 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan, net |  | 172 |  |  | 13,485 |  |  | 13,657 |
Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units |  | 2,407 |  |  | 188,450 |  |  | 190,857 |
Outstanding at December 31, 2016 |  | 1,717,743 |  |  | 152,072,432 |  |  | 153,790,175 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan |  | 21 |  |  | 6,296 |  |  | 6,317 |
Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan, net |  | 111 |  |  | 33,046 |  |  | 33,157 |
Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units |  | 1,665 |  |  | 493,972 |  |  | 495,637 |
Outstanding at December 31, 2017 |  | 1,719,540 |  |  | 152,605,746 |  |  | 154,325,286 |
Schedule of changes in Series B Preferred Units [Table Text Block] | The following table reflects the activity of the Series B Preferred Units for the years ended December 31, 2017, 2016 and 2015 (in thousands), which activity is included within Boston Properties Limited Partnership’s Consolidated Statements of Partners’ Capital:
Balance at December 31, 2014 | $ | 193,623 |
Net income | 10,500 |
Distributions | (10,500 | )
Balance at December 31, 2015 | 193,623 |
Net income | 10,500 |
Distributions | (10,500 | )
Balance at December 31, 2016 | 193,623 |
Net income | 10,500 |
Distributions | (10,500 | )
Balance at December 31, 2017 | $ | 193,623 |
Series B Preferred Stock [Member] |
Class of Stock [Line Items] |
Dividends Declared [Table Text Block] | The following table presents Boston Properties Inc.’s dividends per share on its outstanding Series B Preferred Stock paid or payable in 2017:
Record Date |  | Payment Date |  | Dividend (Per Share) |
February 2, 2018 |  | February 15, 2018 |  |  | $32.8125 |
November 3, 2017 |  | November 15, 2017 |  | 32.8125 |
August 4, 2017 |  | August 15, 2017 |  | 32.8125 |
May 5, 2017 |  | May 15, 2017 |  | 32.8125 |
February 3, 2017 |  | February 15, 2017 |  | 32.8125 |

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