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Real Estate (Summary Of The Discontinued Operations (Details) - USD ($) $ 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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 624,240 | $ 629,884 | $ 618,221 | $ 618,476 | $ 613,707 | $ 618,803 | $ 589,794 | $ 574,694 | $ 2,490,821 | $ 2,396,998 | $ 2,135,539
Expenses |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 639,542 | 628,573 | 560,637
Total expenses |  |  |  |  |  |  |  |  | 1,641,456 | 1,595,176 | 1,457,419
Operating income |  |  |  |  |  |  |  |  | 849,365 | 801,822 | 678,120
Other Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 432,196 | 455,743 | 446,880
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership |  |  |  |  |  |  |  |  | 0 | 0 | (14,151)
Income from discontinued operations attributable to Boston Properties, Inc. |  |  |  |  |  |  |  |  |  |  | 123,641
Gain on sale of real estate from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 112,829
Gain on forgiveness of debt from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 20,182
Impairment loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (3,241)
Boston Properties Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 624,240 | $ 629,884 | $ 618,221 | $ 618,476 | $ 613,707 | $ 618,803 | $ 589,794 | $ 574,694 | 2,490,821 | 2,396,998 | 2,135,539
Expenses |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 631,549 | 620,064 | 552,589
Total expenses |  |  |  |  |  |  |  |  | 1,633,463 | 1,586,667 | 1,445,466
Operating income |  |  |  |  |  |  |  |  | 857,358 | 810,331 | 690,073
Other Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 432,196 | 455,743 | 446,880
Income from discontinued operations attributable to Boston Properties, Inc. |  |  |  |  |  |  |  |  |  |  | 141,365
Gain on sale of real estate from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 115,459
Gain on forgiveness of debt from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 20,736
Impairment loss from discontinued operations |  |  |  |  |  |  |  |  | $ 0 | $ 0 | (2,852)
Montvale Center, 303 Almaden Blvd, 1301 New York Avenue, One Preserve Parkway and 10 & 20 Burlington Mall Road [Member] | Boston Properties, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 20,138
Expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  |  |  | 6,996
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,760
Total expenses |  |  |  |  |  |  |  |  |  |  | 11,756
Operating income |  |  |  |  |  |  |  |  |  |  | 8,382
Other Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 360
Income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 8,022
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership |  |  |  |  |  |  |  |  |  |  | (803)
Income from discontinued operations attributable to Boston Properties, Inc. |  |  |  |  |  |  |  |  |  |  | 7,219
Gain on sale of real estate from discontinued operations |  |  |  |  |  |  |  |  |  |  | 112,829
Gain on forgiveness of debt from discontinued operations |  |  |  |  |  |  |  |  |  |  | 20,182
Impairment loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | (3,241)
Noncontrolling interest in gain on sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations - common units of the Operating Partnership |  |  |  |  |  |  |  |  |  |  | (13,348)
Gain on sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc |  |  |  |  |  |  |  |  |  |  | 116,422
Montvale Center, 303 Almaden Blvd, 1301 New York Avenue, One Preserve Parkway and 10 & 20 Burlington Mall Road [Member] | Boston Properties Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 20,138
Expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  |  |  | 6,996
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,760
Total expenses |  |  |  |  |  |  |  |  |  |  | 11,756
Operating income |  |  |  |  |  |  |  |  |  |  | 8,382
Other Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 360
Income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 8,022
Gain on sale of real estate from discontinued operations |  |  |  |  |  |  |  |  |  |  | 115,459
Gain on forgiveness of debt from discontinued operations |  |  |  |  |  |  |  |  |  |  | 20,736
Impairment loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ (2,852)

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