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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic Earnings:        
Net income attributable to the company's common shareholders / unitholders $ 266,525 $ 164,318 $ 764,232 $ 262,431
Net income attributable to the company's common shareholders / unitholders (in shares / units) 155,386,000 154,555,000 155,199,000 154,540,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 1.72 $ 1.06 $ 4.92 $ 1.70
Allocation of undistributed earnings to participating securities $ (336) $ (48) $ (1,344)  
Allocation of undistributed earnings to participating securities (in shares / units) 0 0 0  
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ (0.01) $ 0 $ 0  
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities $ 266,189 $ 164,270 $ 762,888 $ 262,431
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities (in shares / units) 155,386,000 154,555,000 155,199,000 154,540,000
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities (in dollars per share / unit) $ 1.71 $ 1.06 $ 4.92 $ 1.70
Effect of Dilutive Securities:        
Stock Based Compensation $ 0 $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 21,000 319,000 134,000 319,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ 0 $ (0.01) $ (0.01)
Diluted Earnings:        
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 266,189 $ 164,270 $ 762,888 $ 262,431
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 155,407,000 154,874,000 155,333,000 154,859,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 1.71 $ 1.06 $ 4.91 $ 1.69
Boston Properties Limited Partnership        
Redeemable Common Units 17,273,000 17,647,000 17,405,000 17,627,000
Basic Earnings:        
Net income attributable to the company's common shareholders / unitholders $ 301,975 $ 185,715 $ 868,308 $ 299,097
Net income attributable to the company's common shareholders / unitholders (in shares / units) 172,659,000 172,202,000 172,604,000 172,167,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 1.75 $ 1.08 $ 5.03 $ 1.74
Allocation of undistributed earnings to participating securities $ (374) $ (54) $ (1,495)  
Allocation of undistributed earnings to participating securities (in shares / units) 0 0 0  
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ 0 $ 0 $ (0.01)  
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities $ 301,601 $ 185,661 $ 866,813 $ 299,097
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities (in shares / units) 172,659,000 172,202,000 172,604,000 172,167,000
Net income attributable to the company's common shareholders / unitholders, after allocation of undistributed earnings to participating securities (in dollars per share / unit) $ 1.75 $ 1.08 $ 5.02 $ 1.74
Effect of Dilutive Securities:        
Stock Based Compensation $ 0 $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 21,000 319,000 134,000 319,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ 0 $ 0 $ (0.01)
Diluted Earnings:        
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 301,601 $ 185,661 $ 866,813 $ 299,097
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 172,680,000 172,521,000 172,738,000 172,486,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 1.75 $ 1.08 $ 5.02 $ 1.73