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Noncontrolling Interests Common units for Boston Properties Limited Partnership (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Noncontrolling Interest [Line Items] |  |  |  |
Conversion of redeemable partnership units |  | $ 0 |  |
Cumulative effect of a change in accounting principle | $ (2,035) |  |  |
Accumulated other comprehensive income (loss) | (51,796) | (73,943) | $ (52,251) | $ (14,114)
Noncontrolling Interests [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Conversion of redeemable partnership units | 16,986 | 10,094 |  |
Cumulative effect of a change in accounting principle | (1,763) |  |  |
Boston Properties Limited Partnership |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Cumulative effect of a change in accounting principle | (272) |  |  |
Accumulated other comprehensive income (loss) | (60,346) | (85,043) | $ (60,853) | $ (18,337)
Boston Properties Limited Partnership | Noncontrolling Interests [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Beginning balance | 2,262,040 | 2,286,689 |  |
Contributions | 31,465 | 31,492 |  |
Net income | 40,350 | 42,120 |  |
Distributions | (40,292) | (35,500) |  |
Conversion of redeemable partnership units | (16,812) | (5,881) |  |
Unearned compensation | (5,194) | (10,072) |  |
Cumulative effect of a change in accounting principle | (1,763) |  |  |
Accumulated other comprehensive income (loss) | 52 | (6,877) |  |
Adjustments to reflect redeemable preferred units at redemption value | (103,556) | 151,545 |  |
Ending balance | $ 2,166,290 | $ 2,453,516 |  |

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