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Noncontrolling Interests Common units for Boston Properties Limited Partnership (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Noncontrolling Interest [Line Items] |  |  |
Conversion of redeemable partnership units |  | $ 0 |
Cumulative effect of a change in accounting principle | $ 5,496 | (2,035) |
Other comprehensive income | (45,137) |  | $ (50,429)
Noncontrolling Interests [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Conversion of redeemable partnership units | 18,023 | 16,986 |
Cumulative effect of a change in accounting principle | 563 | (1,763) |
Boston Properties Limited Partnership |  |  |
Noncontrolling Interest [Line Items] |  |  |
Cumulative effect of a change in accounting principle | 4,933 | (272) |
Boston Properties Limited Partnership | Noncontrolling Interests [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Beginning balance | 2,292,263 | 2,262,040 |
Contributions | 34,970 | 31,465 |
Net income | 49,128 | 40,350 |
Distributions | (45,730) | (40,292) |
Conversion of redeemable partnership units | (2,112) | (16,812) |
Unearned compensation | (5,754) | (5,194) |
Cumulative effect of a change in accounting principle | 563 | (1,763) |
Other comprehensive income | 599 | 52 |
Adjustments to reflect redeemable preferred units at redemption value | (133,263) | (103,556) |
Ending balance | $ 2,190,664 | $ 2,166,290 |

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