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Noncontrolling Interests Common units for Boston Properties LImited Partnership (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Noncontrolling Interest [Line Items] |  |  |  |
Conversion of redeemable partnership units |  | $ 0 |  |
Accumulated other comprehensive loss | $ (56,706) | (11,907) | $ (14,114) | $ (9,304)
Noncontrolling Interests [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Conversion of redeemable partnership units | 438 | (5,162) |  |
Boston Properties Limited Partnership |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Accumulated other comprehensive loss | (65,830) | (15,879) | $ (18,337) | $ (12,973)
Boston Properties Limited Partnership | Noncontrolling Interests [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Beginning balance | 2,286,689 | 2,310,046 |  |
Contributions | 30,808 | 38,371 |  |
Net Income | 21,393 | 20,188 |  |
Distributions | (11,865) | (11,705) |  |
Conversion of redeemable partnership units | (446) | (8,689) |  |
Unearned Compensation | (22,424) | (18,597) |  |
Accumulated other comprehensive loss | (4,901) | (303) |  |
Adjustments To Reflect Redeemable Preferred Units At Redemption Value | 8,218 | 211,747 |  |
Ending balance | $ 2,307,472 | $ 2,541,058 |  |

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