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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic Earnings:      
Net income attributable to the company's common shareholders / unitholders $ 862,227 $ 511,034 $ 572,347
Net income attributable to the company's common shareholders / unitholders (in shares / units) 155,432,000 154,582,000 154,427,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 5.55 $ 3.31 $ 3.71
Allocation of undistributed earnings to participating securities $ (748)   $ (101)
Allocation of undistributed earnings to participating securities (in shares / units) 0   0
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ (0.01)   $ 0
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic $ 861,479   $ 572,246
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) 155,432,000   154,427,000
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share) $ 5.54   $ 3.71
Effect of Dilutive Securities:      
Stock Based Compensation $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 85,000 301,000 255,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ (0.01) $ (0.01)
Diluted Earnings:      
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 861,479 $ 511,034 $ 572,246
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 155,517,000 154,883,000 154,682,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 5.54 $ 3.30 $ 3.70
Boston Properties Limited Partnership      
Redeemable Common Units 17,211,000 17,618,000 17,485,000
Basic Earnings:      
Net income attributable to the company's common shareholders / unitholders $ 979,979 $ 580,102 $ 656,903
Net income attributable to the company's common shareholders / unitholders (in shares / units) 172,643,000 172,200,000 171,912,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 5.68 $ 3.37 $ 3.82
Allocation of undistributed earnings to participating securities $ (830)   $ (113)
Allocation of undistributed earnings to participating securities (in shares / units) 0   0
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ (0.01)   $ 0
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic $ 979,149   $ 656,790
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) 172,643,000   171,912,000
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share) $ 5.67   $ 3.82
Effect of Dilutive Securities:      
Stock Based Compensation $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 85,000 301,000 255,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ (0.01) $ (0.01)
Diluted Earnings:      
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 979,149 $ 580,102 $ 656,790
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 172,728,000 172,501,000 172,167,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 5.67 $ 3.36 $ 3.81