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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership
Jun. 30, 2018
shares
Noncontrolling Interests [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
Operating Partnership (OP) Units (in shares) 16,831,182
Long-Term Incentive Plan (LTIP) Units (in shares) 992,387
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) 68,889
2014 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2014 MYLTIP (in units) 23,187
2015 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2015 MYLTIPS (in units) 28,724
2016 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2016 MYLTIPs (in units) 471,579
2017 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2017 MYLTIP (in units) 398,871
2018 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2018 MYLTIP 341,366