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Stockholders' Equity / Partners' Capital Stockholders' Equity / Partners' Capital Dividends / Distributions (Details) - $ / shares | May 15, 2019 | Apr. 30, 2019 | Feb. 15, 2019 | Jan. 30, 2019 | Aug. 15, 2018 | Jul. 31, 2018 | May 15, 2018 | Apr. 30, 2018 | Feb. 15, 2018 | Jan. 30, 2018 | Jun. 10, 2019
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Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share / Unit |  |  |  |  |  |  |  |  |  |  | $ 0.95
Dividends, Per Share / Unit |  | $ 0.95 |  | $ 0.95 |  | $ 0.80 |  | $ 0.80 |  | $ 0.80 |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share / Unit |  |  |  |  |  |  |  |  |  |  | 0.95
Dividends, Per Share / Unit |  | $ 0.95 |  | $ 0.95 |  | $ 0.80 |  | $ 0.80 |  | $ 0.80 |
Series B Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share / Unit |  |  |  |  |  |  |  |  |  |  | $ 32.8125
Dividends, Per Share / Unit | $ 32.8125 |  | $ 32.8125 |  | $ 32.8125 |  | $ 32.8125 |  | $ 32.8125 |  |

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