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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic Earnings:        
Net income attributable to the Company's common shareholders / unitholders $ 96,597 $ 79,460 $ 278,323 $ 250,694
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 153,662,000 153,450,000 153,644,000 153,341,000
Net income (in dollars per share / unit) $ 0.63 $ 0.52 $ 1.81 $ 1.63
Allocation of undistributed earnings to participating securities (numberator)     $ (241) $ (141)
Allocation of undistributed earnings to participating securities (in shares / units)     0 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units)     $ 0 $ 0
Net income attributable to the Company's common shareholders / unitholders     $ 278,082 $ 250,553
Net income attributable to the Company'scommon shareholders / unitholders(in shares / units)     153,644,000 153,341,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit)     $ 1.81 $ 1.63
Effect of Dilutive Securities:        
Stock Based Compensation, Income (Numerator) $ 0 $ 0 $ 0 $ 0
Stock Based Compensation, Shares / Units (Denominator) 198,000 365,000 245,000 504,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) $ 0.00 $ 0.00 $ 0.00 $ 0.00
Diluted Earnings:        
Net income attributable to the Company's common shareholders / unitholders (Numerator) $ 96,597 $ 79,460 $ 278,082 $ 250,553
Net income attributable to the Company's common shareholders / unitholders (in shares / units) (Denominator) 153,860,000 153,815,000 153,889,000 153,845,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.63 $ 0.52 $ 1.81 $ 1.63
Boston Properties Limited Partnership        
Entity Information [Line Items]        
Redeemable Common Units 17,708,000 17,696,000 17,695,000 17,775,000
Basic Earnings:        
Net income attributable to the Company's common shareholders / unitholders $ 109,938 $ 90,852 $ 317,234 $ 284,221
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 171,370,000 171,146,000 171,339,000 171,116,000
Net income (in dollars per share / unit) $ 0.64 $ 0.53 $ 1.85 $ 1.66
Allocation of undistributed earnings to participating securities (numberator)     $ (269) $ (157)
Allocation of undistributed earnings to participating securities (in shares / units)     0 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units)     $ 0 $ 0.00
Net income attributable to the Company's common shareholders / unitholders     $ 316,965 $ 284,064
Net income attributable to the Company'scommon shareholders / unitholders(in shares / units)     171,339,000 171,116,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit)     $ 1.85 $ 1.66
Effect of Dilutive Securities:        
Stock Based Compensation, Income (Numerator) $ 0 $ 0 $ 0 $ 0
Stock Based Compensation, Shares / Units (Denominator) 198,000 365,000 245,000 504,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) $ 0.00 $ 0.00 $ 0.00 $ 0.00
Diluted Earnings:        
Net income attributable to the Company's common shareholders / unitholders (Numerator) $ 109,938 $ 90,852 $ 316,965 $ 284,064
Net income attributable to the Company's common shareholders / unitholders (in shares / units) (Denominator) 171,568,000 171,511,000 171,584,000 171,620,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.64 $ 0.53 $ 1.85 $ 1.66