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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Basic Earnings: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to the Company (Numerator) |  |  |  |  |  |  |  |  | $ 572,606 | $ 433,111 | $ 618,113
Net income attributable to the Company in Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 153,471,000 | 153,089,000 | 152,201,000
Income from continuing operations attributable to the Company Per Share / Per Unit Amount (in dollars per share / unit) |  |  |  |  |  |  |  |  | $ 3.73 | $ 2.83 | $ 4.06
Discontinued operations attributable to the Company Income (Numerator) |  |  |  |  |  |  |  |  |  |  | $ 123,641
Discontinued Operations (in shares) |  |  |  |  |  |  |  |  |  |  | 0
Discontinued operations attributable to the Company Per Share / Unit Amount (in dollars per share / unit) |  |  |  |  |  |  |  |  |  |  | $ 0.81
Net Income Loss Available To the Company's Common Stockholders / Unitholders |  |  |  |  |  |  |  |  |  |  | $ 741,594
Allocation of undistributed earnings to participating securities |  |  |  |  |  |  |  |  |  |  | $ (160)
Allocation of undistributed earnings to participating securities (in shares) |  |  |  |  |  |  |  |  |  |  | 0
Allocation of undistributed earnings to participating securities (in shares) |  |  |  |  |  |  |  |  |  |  | $ 0.00
Net income attributable to the Company Per Share / Unit Amount (in dollars per share / unit) | $ 0.90 | $ 1.20 | $ 0.52 | $ 1.12 | $ 1.14 | $ 0.83 | $ 0.50 | $ 0.35 | $ 3.73 | $ 2.83 | $ 4.87
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator) |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Stock Based Compensation and Exchangeable Senior Notes, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 373,000 | 219,000 | 320,000
Stock Based Compensation and Exchangeable Senior Notes Per Share / Unit Amount |  |  |  |  |  |  |  |  | $ (0.01) | $ 0.00 | $ (0.01)
Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Diluted Earnings: Net income, Income (Numerator) |  |  |  |  |  |  |  |  | $ 572,606 | $ 433,111 | $ 741,594
Diluted Earnings: Net income, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 153,844,000 | 153,308,000 | 152,521,000
Diluted Earnings: Net income, Per Share / Unit Amount (in dollars per share / unit) | 0.90 | 1.20 | 0.52 | 1.11 | 1.14 | 0.83 | 0.50 | 0.35 | $ 3.72 | $ 2.83 | $ 4.86
Boston Properties Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |
Redeemable Common Units |  |  |  |  |  |  |  |  | 17,668,000 | 17,364,000 | 16,925,000
Basic Earnings: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to the Company (Numerator) |  |  |  |  |  |  |  |  | $ 648,748 | $ 499,129 | $ 700,151
Net income attributable to the Company in Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 171,139,000 | 170,453,000 | 169,126,000
Income from continuing operations attributable to the Company Per Share / Per Unit Amount (in dollars per share / unit) |  |  |  |  |  |  |  |  | $ 3.79 | $ 2.93 | $ 4.14
Discontinued operations attributable to the Company Income (Numerator) |  |  |  |  |  |  |  |  |  |  | $ 141,365
Discontinued Operations (in shares) |  |  |  |  |  |  |  |  |  |  | 0
Discontinued operations attributable to the Company Per Share / Unit Amount (in dollars per share / unit) |  |  |  |  |  |  |  |  |  |  | $ 0.84
Net Income Loss Available To the Company's Common Stockholders / Unitholders |  |  |  |  |  |  |  |  |  |  | $ 841,338
Allocation of undistributed earnings to participating securities |  |  |  |  |  |  |  |  |  |  | $ (178)
Allocation of undistributed earnings to participating securities (in shares) |  |  |  |  |  |  |  |  |  |  | 0
Allocation of undistributed earnings to participating securities (in shares) |  |  |  |  |  |  |  |  |  |  | $ (0.01)
Net income attributable to the Company Per Share / Unit Amount (in dollars per share / unit) | 0.92 | 1.21 | 0.53 | 1.13 | 1.20 | 0.85 | 0.51 | 0.37 | $ 3.79 | $ 2.93 | $ 4.97
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator) |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Stock Based Compensation and Exchangeable Senior Notes, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 373,000 | 219,000 | 320,000
Stock Based Compensation and Exchangeable Senior Notes Per Share / Unit Amount |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.01) | $ 0.00
Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Diluted Earnings: Net income, Income (Numerator) |  |  |  |  |  |  |  |  | $ 648,748 | $ 499,129 | $ 841,338
Diluted Earnings: Net income, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 171,512,000 | 170,672,000 | 169,446,000
Diluted Earnings: Net income, Per Share / Unit Amount (in dollars per share / unit) | $ 0.92 | $ 1.21 | $ 0.53 | $ 1.12 | $ 1.20 | $ 0.85 | $ 0.51 | $ 0.37 | $ 3.78 | $ 2.92 | $ 4.97

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