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Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2018
Entity Information [Line Items] |
Dividends Declared [Table Text Block] | The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid or payable in 2018:
Record Date |  | Payment Date |  | Dividend (Per Share) |  |  | Distribution (Per Unit) |
December 31, 2018 |  | January 30, 2019 |  |  | $0.95 |  |  |  | $0.95 |
September 28, 2018 |  | October 31, 2018 |  |  | $0.95 |  |  |  | $0.95 |
June 29, 2018 |  | July 31, 2018 |  |  | $0.80 |  |  |  | $0.80 |
March 29, 2018 |  | April 30, 2018 |  |  | $0.80 |  |  |  | $0.80 |
December 29, 2017 |  | January 30, 2018 |  |  | $0.80 |  |  |  | $0.80 |
Schedule Of Noncontrolling Interest Property Partnerships [Table Text Block] | The following table reflects the activity of the noncontrolling interests—property partnerships for the years ended December 31, 2018, 2017 and 2016 (in thousands):
Balance at December 31, 2015 | $ | 1,574,400 |
Capital contributions | 10,756 |
Net loss | (2,068 | )
Accumulated other comprehensive loss | (877 | )
Distributions | (51,564 | )
Balance at December 31, 2016 | 1,530,647 |
Capital contributions (1) | 161,585 |
Net income | 47,832 |
Accumulated other comprehensive loss | (2,128 | )
Distributions | (54,176 | )
Balance at December 31, 2017 | 1,683,760 |
Capital contributions | 46,701 |
Net income | 62,909 |
Accumulated other comprehensive income | 576 |
Distributions | (82,501 | )
Balance at December 31, 2018 | $ | 1,711,445 |
Boston Properties Limited Partnership |
Entity Information [Line Items] |
Schedule Of Noncontrolling Interest Common Units [Table Text Block] | The following table reflects the activity of noncontrolling interests—redeemable common units of Boston Properties Limited Partnership for the years ended December 31, 2018, 2017 and 2016 (in thousands):
Balance at December 31, 2015 | $ | 2,286,689 |
Contributions | 31,395 |
Net income | 59,260 |
Distributions | (49,087 | )
Conversion of redeemable partnership units | (6,461 | )
Unearned compensation | (3,464 | )
Other comprehensive loss | (4,379 | )
Adjustment to reflect redeemable partnership units at redemption value | (51,913 | )
Balance at December 31, 2016 | 2,262,040 |
Contributions | 31,743 |
Net income | 52,210 |
Distributions | (54,494 | )
Conversion of redeemable partnership units | (16,916 | )
Unearned compensation | 1,650 |
Cumulative effect of a change in accounting principle | (1,763 | )
Other comprehensive income | 206 |
Adjustment to reflect redeemable partnership units at redemption value | 17,587 |
Balance at December 31, 2017 | 2,292,263 |
Contributions | 34,680 |
Net income | 66,807 |
Distributions | (62,731 | )
Conversion of redeemable partnership units | (2,880 | )
Unearned compensation | 2,181 |
Cumulative effect of a change in accounting principle | 563 |
Other comprehensive income | 304 |
Adjustment to reflect redeemable partnership units at redemption value | (330,596 | )
Balance at December 31, 2018 | $ | 2,000,591 |
Noncontrolling Interests [Member] |
Entity Information [Line Items] |
Dividends Declared [Table Text Block] | The following table presents Boston Properties Limited Partnership’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 MYLTIP Units, 2014 MYLTIP Units and, after the February 4, 2018 measurement date, the 2015 MYLTIP Units) and its distributions on the 2015 MYLTIP Units (prior to the February 4, 2018 measurement date), 2016 MYLTIP Units, 2017 MYLTIP Units and 2018 MYLTIP Units (after the February 5, 2018 issuance date) paid in 2018:
Record Date |  | Payment Date |  | Distributions per OP Unit and LTIP Unit |  | Distributions per MYLTIP Unit
December 31, 2018 |  | January 30, 2019 |  |  | $0.95 |  |  |  | $0.095 |
September 28, 2018 |  | October 31, 2018 |  |  | $0.95 |  |  |  | $0.095 |
June 29, 2018 |  | July 31, 2018 |  |  | $0.80 |  |  |  | $0.080 |
March 29, 2018 |  | April 30, 2018 |  |  | $0.80 |  |  |  | $0.080 |
December 29, 2017 |  | January 30, 2018 |  |  | $0.80 |  |  |  | $0.080 |

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