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(Common Units) (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 06, 2020 USD ($) shares | Mar. 31, 2020 USD ($) shares yr $ / shares | Dec. 31, 2019 USD ($)
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 |  |
MYLTIP Units forfeited | 270,942 |  |
OP Units [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
OP Units for redemption (in shares) |  | 461,856 |
Redemption of OP units issued on conversion of LTIP, OPP and MYLTIP units (in shares) |  | 71,303 |
MYLTIP Units distribution as percentage of OP Unit distribution prior to measurement date |  | 10.00% |
Restriction on redemption of OP Unit to Common Stock (in years) | yr |  | 1 |
Redemption of OP Unit equivalent to Common Stock (in shares) |  | 1 |
Common units of operating partnership if converted value | $ |  | $ 1,600,000 |
Closing price of common stock (in dollars per share) | $ / shares |  | $ 92.23 |
Boston Properties Limited Partnership |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Common units of operating partnership if converted value | $ |  | $ 1,639,855 | $ 2,468,753
Boston Properties Limited Partnership | MYLTIP 2017 [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
2017 MYLTIP |  | 116,167 |
Boston Properties Limited Partnership | MYLTIP 2018 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
2018 MYLTIP |  | 336,195 |
Boston Properties Limited Partnership | MYLTIP 2019 [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
2019 MYLTIPS |  | 220,734 |
Boston Properties Limited Partnership | MYLTIP 2020 [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
2020 MYLTIP |  | 203,278 |

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