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(Common Units) (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended
Jan. 29, 2013
Mar. 31, 2013
Y
Mar. 11, 2013
OP Units [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
OP Units for redemption (in shares)   8,762  
Redemption of OP units issued on conversion of LTIP Units (in shares)   5,329  
Outperformance Awards LTIP Units distribution as percentage of OP Unit distribution prior to measurement date   10.00%  
Distributions made to OP and LTIP units per unit (in dollars per share) $ 0.65    
Distribution paid to outperformance awards, OPP Units (in dollars per share) $ 0.065    
Distribution declared to OP and LTIP units by Boston Properties, Inc. (in dollars per share)     $ 0.65
Distribution declared to outperformance awards OPP Units by Boston Properties, Inc. (in dollars per share)     $ 0.065
Restriction on redemption of OP Unit to Common Stock (in years)   1  
Redemption of OP Unit equivalence to Common Stock (in shares)   1  
Common units of operating partnership if converted value   $ 1,800,000,000  
Value of Series Two Preferred Units assuming conversion   $ 132,100,000  
OPP Units 2011 [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Outperformance awards in LTIP Units (in shares)   400,000  
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)   400,000  
OP Units [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Closing price of common stock (in dollars per share)   $ 101.06  
Quarter 4 2012 [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Dividend payable date   Jan. 29, 2013  
Quarter 4 2012 [Member] | OP Units [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Dividend payable date   Jan. 29, 2013  
Holders of record date   Dec. 31, 2012  
Quarter 1 2013 [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Dividend payable date   Apr. 30, 2013  
Dividends payable, date declared   Mar. 11, 2013  
Quarter 1 2013 [Member] | OP Units [Member]
     
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Dividend payable date   Apr. 30, 2013  
Holders of record date   Mar. 29, 2013  
Dividends payable, date declared   Mar. 11, 2013