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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest in Limited Partnerships | $ 1,548,455 | $ 1,556,553
Boston Properties Limited Partnership | OP Units [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 16,550,441 |
Boston Properties Limited Partnership | LTIP Units [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 1,678,082 |
Boston Properties Limited Partnership | 2012 OPP and 2013-2019 MYLTIP |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 466,233 |
Boston Properties Limited Partnership | MYLTIP 2020 [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 203,278 |
Boston Properties Limited Partnership | MYLTIP 2021 |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 351,447 |
Boston Properties Limited Partnership | MYLTIP 2022 |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Noncontrolling Interest, Outstanding | 254,061 |

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