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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership
Sep. 30, 2016
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) 17,096,675
Long-Term Incentive Plan (LTIP) Units (in shares) 905,494
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) 166,629
2013 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2013 MYLTIP (in units) 93,928
MYLTIP 2014 [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2014 MYLTIP (in units) 474,415
2015 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2015 MYLTIPS (in units) 367,218
2016 MYLTIP [Member]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
2016 MYLTIPs (in units) 473,360