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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic Earnings:    
Net income attributable to the company's common shareholders / unitholders $ 91,624 $ 497,496
Net income attributable to the company's common shareholders / unitholders (in shares / units) 155,928,000 155,011,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 0.59 $ 3.21
Allocation of undistributed earnings to participating securities   $ (1,011)
Allocation of undistributed earnings to participating securities (in shares / units)   0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)   $ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic   $ 496,485
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)   155,011,000
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share) $ 0.59 $ 3.20
Effect of Dilutive Securities:    
Stock Based Compensation $ 0 $ 0
Stock Based Compensation (in shares / units) 171,000 247,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ 0
Diluted Earnings:    
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 91,624 $ 496,485
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 156,099,000 155,258,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.59 $ 3.20
Boston Properties Limited Partnership    
Redeemable Common Units 17,089,000 17,538,000
Basic Earnings:    
Net income attributable to the company's common shareholders / unitholders $ 105,773 $ 566,333
Net income attributable to the company's common shareholders / unitholders (in shares / units) 173,018,000 172,549,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 0.61 $ 3.28
Allocation of undistributed earnings to participating securities   $ (1,126)
Allocation of undistributed earnings to participating securities (in shares / units)   0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)   $ 0
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic   $ 565,207
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)   172,549,000
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share) $ 0.61 $ 3.28
Effect of Dilutive Securities:    
Stock Based Compensation $ 0 $ 0
Stock Based Compensation (in shares / units) 171,000 247,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ (0.01)
Diluted Earnings:    
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 105,773 $ 565,207
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 173,189,000 172,796,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 0.61 $ 3.27