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(Common Units) (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 14, 2021 USD ($) shares | Feb. 05, 2021 USD ($) shares | Feb. 02, 2021 USD ($) | Feb. 06, 2020 USD ($) shares | Feb. 09, 2019 USD ($) shares | Dec. 31, 2021 USD ($) yr $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Vesting Period |  |  |  |  |  | 4 years |  |
Issuance of operating partnership units for 360 Park Avenue South | $ |  |  |  |  |  | $ 99,689 | $ 0 | $ 0
360 Park South Avenue |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Issuance of operating partnership units for 360 Park Avenue South | $ | $ 99,700 |  |  |  |  |  |  |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $ |  |  |  |  |  | 2,078,603 | 1,643,024 |
Issuance of operating partnership units for 360 Park Avenue South | $ |  |  |  |  |  | $ 99,689 | $ 0 | $ 0
Boston Properties Limited Partnership | 360 Park South Avenue |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued | shares | 866,503 |  |  |  |  |  |  |
MYLTIP | Boston Properties Limited Partnership |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Vesting Period |  |  |  |  |  | 3 years |  |
Unvested MYLTIP Units [Member] |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
unvested MYLTIP distributions as compared to total distributions (percentage) |  |  |  |  |  | 10.00% |  |
MYLTIP 2016 [Member] |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Final awards percentage of target |  |  |  |  | 69.50% |  |  |
Value of MYLTIP Awards | $ |  |  |  |  | $ 13,600 |  |  |
Forfeitures, in units | shares |  |  |  |  | 364,980 |  |  |
MYLTIP 2017 [Member] |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Final awards percentage of target |  |  |  | 83.80% |  |  |  |
Value of MYLTIP Awards | $ |  |  |  | $ 17,600 |  |  |  |
Forfeitures, in units | shares |  |  |  | 270,942 |  |  |  |
MYLTIP 2018 |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Final awards percentage of target |  | 29.20% |  |  |  |  |  |
Value of MYLTIP Awards | $ |  | $ 4,600 |  |  |  |  |  |
Forfeitures, in units | shares |  | 285,925 |  |  |  |  |  |
MYLTIP 2019 [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Outstanding | shares |  |  |  |  |  | 219,916 |  |
MYLTIP 2020 [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Outstanding | shares |  |  |  |  |  | 203,278 |  |
MYLTIP 2021 |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Value of MYLTIP Awards | $ |  |  | $ 15,300 |  |  |  |  |
Vesting Period |  |  | 3 years |  |  |  |  |
MYLTIP 2021 | Boston Properties Limited Partnership |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Outstanding | shares |  |  |  |  |  | 352,021 |  |
OP Units [Member] |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
OP Units for redemption (in shares) | shares |  |  |  |  |  | 523,969 | 856,811 |
Restriction on redemption of OP Unit to Common Stock (in years) | yr |  |  |  |  |  | 1 |  |
Redemption of OP Unit equivalent to Common Stock (in shares) | shares |  |  |  |  |  | 1 |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $ |  |  |  |  |  | $ 2,100,000 |  |
Closing price of common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 115.18 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Issuance of operating partnership units for 360 Park Avenue South | $ |  |  |  |  |  | $ 99,689 |  |
Vested 2012 OPP units and MYLTIPS |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
OP Units for redemption (in shares) | shares |  |  |  |  |  | 148,442 | 88,168 |

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