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Noncontrolling Interests (Common Units) (Narrative) (Details) (USD $)
0 Months Ended3 Months Ended6 Months Ended9 Months Ended12 Months Ended
Feb. 05, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Sep. 30, 2011
Dec. 31, 2010
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Dividend paid date  Jul. 29, 2011Apr. 29, 2011   Jan. 28, 2011
Dividend payable date Oct. 31, 2011      
Dividends payable, date declared Sep. 16, 2011      
Noncontrolling Interests [Member]
        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Outperformance awards in LTIP Units 400,000    400,000 
Noncontrolling Interests [Member] | Series Two Preferred Units [Member]
        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Closing price of common stock $ 89.10    $ 89.10 
OP Units [Member]
        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
OP Units for redemption      2,442,407 
Redemption of OP units issued on conversion of LTIP Units      58,213 
Outperformance awards in LTIP Units 400,000    400,000 
Outperformance Awards LTIP Units distribution as percentage of OP Unit distribution prior to measurement date      10.00% 
Repayment Amount per Forfeited OPP Award0.25       
Distributions made to OP and LTIP units per unit   $ 0.50 $ 0.50 $ 0.50
Distribution paid to outperformance awards, OPP Units   $ 0.05 $ 0.05 $ 0.05
Distribution declared to OP and LTIP units by Boston Properties, Inc. $ 0.50    $ 0.50 
Distribution declared to outperformance awards OPP Units by Boston Properties, Inc. $ 0.05    $ 0.05 
Dividend paid date  Jul. 29, 2011Apr. 29, 2011Jan. 28, 2011   
Dividend payable date Oct. 31, 2011      
Holders of record date September 30, 2011June 30, 2011March 31, 2011December 31, 2010   
Dividends payable, date declared Sep. 16, 2011      
Restriction on redemption of OP Unit to Common Stock, years      1 
Redemption of OP Unit equivalence to Common Stock      1 
Common units of operating partnership if converted value 1,660,000,000    1,660,000,000 
Value of Series Two Preferred Units assuming conversion $ 130,100,000    $ 130,100,000