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Noncontrolling Interests Redeemable common units of Boston Properties Limited Partnership (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Conversion of redeemable partnership units | $ 0 | $ 0 | $ 0
Cumulative effect of a change in accounting principle | (2,035) |  |
Adjustment to reflect redeemable partnership units at redemption value |  |  | 5,128
Boston Properties Limited Partnership |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Cumulative effect of a change in accounting principle | (272) |  |
Noncontrolling Interest [Member] |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Conversion of redeemable partnership units | (22,879) | (15,374) | (17,137)
Cumulative effect of a change in accounting principle | (1,763) |  |
Noncontrolling Interest [Member] | Boston Properties Limited Partnership |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Beginning Balance | 2,262,040 | 2,286,689 | 2,310,046
Contributions | 31,743 | 31,395 | 39,030
Net income | 52,210 | 59,260 | 66,951
Distributions | (54,494) | (49,087) | (69,447)
Conversion of redeemable partnership units | (16,916) | (6,461) | (14,343)
Unearned compensation | 1,650 | (3,464) | (4,579)
Cumulative effect of a change in accounting principle | (1,763) |  |
Other Comprehensive Loss, | 206 | (4,379) | (554)
Adjustment to reflect redeemable partnership units at redemption value | 17,587 | (51,913) | (40,415)
Ending Balance | $ 2,292,263 | $ 2,262,040 | $ 2,286,689

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