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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership | Sep. 30, 2017 shares
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Noncontrolling Interests [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Operating Partnership (OP) Units (in shares) | 16,812,329
Long-Term Incentive Plan (LTIP) Units (in shares) | 816,982
OPP Units 2012 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Outperformance awards in LTIP Units (in shares) | 118,067
2013 MYLTIP [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2013 MYLTIP (in units) | 85,405
MYLTIP 2014 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2014 MYLTIP (in units) | 25,107
2015 MYLTIP [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2015 MYLTIPS (in units) | 366,618
2016 MYLTIP [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2016 MYLTIPs (in units) | 473,360
2017 MYLTIP [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2017 MYLTIP (in units) | 400,000

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