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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic Earnings:        
Net income attributable to the Company's common shareholders / unitholders $ 128,681 $ 133,709 $ 304,682 $ 230,764
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 154,415,000 154,177,000 154,400,000 154,019,000
Net income (in dollars per share / unit) $ 0.83 $ 0.87 $ 1.97 $ 1.50
Allocation of undistributed earnings to participating securities (numerator) $ (16) $ (43) $ (142) $ (9)
Allocation of undistributed earnings to participating securities (in shares) 0 0 0 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) $ 0 $ 0 $ 0 $ 0
Net income attributable to the Company's common shareholders / unitholders $ 128,665 $ 133,666 $ 304,540 $ 230,755
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 154,415,000 154,177,000 154,400,000 154,019,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) $ 0.83 $ 0.87 $ 1.97 $ 1.50
Effect of Dilutive Securities:        
Stock Based Compensation, Income (Numerator) $ 0 $ 0 $ 0 $ 0
Stock Based Compensation, Shares / Units (Denominator) 156,000 154,000 238,000 254,000
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) $ 128,665 $ 133,666 $ 304,540 $ 230,755
Net income attributable to to the Company's shareholders / unitholder (number of shares) 154,571,000 154,331,000 154,638,000 154,273,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.83 $ 0.87 $ 1.97 $ 1.50
Boston Properties Limited Partnership        
Entity Information [Line Items]        
Redeemable Common Units 17,501,000 17,498,000 17,492,000 17,609,000
Basic Earnings:        
Net income attributable to the Company's common shareholders / unitholders $ 145,961 $ 151,844 $ 346,868 $ 262,506
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 171,916,000 171,675,000 171,892,000 171,628,000
Net income (in dollars per share / unit) $ 0.85 $ 0.88 $ 2.02 $ 1.53
Allocation of undistributed earnings to participating securities (numerator) $ (18) $ (48) $ (158) $ (10)
Allocation of undistributed earnings to participating securities (in shares) 0 0 0 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) $ 0 $ 0 $ 0 $ 0.00
Net income attributable to the Company's common shareholders / unitholders $ 145,943 $ 151,796 $ 346,710 $ 262,496
Net income attributable to the Company's common shareholders / unitholders (in shares / units) 171,916,000 171,675,000 171,892,000 171,628,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) $ 0.85 $ 0.88 $ 2.02 $ 1.53
Effect of Dilutive Securities:        
Stock Based Compensation, Income (Numerator) $ 0 $ 0 $ 0 $ 0
Stock Based Compensation, Shares / Units (Denominator) 156,000 154,000 238,000 254,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) $ 0.00 $ 0.00 $ (0.01) $ 0.00
Diluted Earnings:        
Net income attributable to the Company's common shareholders / unitholders (Numerator) $ 145,943 $ 151,796 $ 346,710 $ 262,496
Net income attributable to to the Company's shareholders / unitholder (number of shares) 172,072,000 171,829,000 172,130,000 171,882,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.85 $ 0.88 $ 2.01 $ 1.53