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Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2017
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 2017:
Record Date |  | Payment Date |  | Dividend (Per Share) |  |  | Distribution (Per Unit) |
December 29, 2017 |  | January 30, 2018 |  |  | $0.80 |  |  |  | $0.80 |
September 29, 2017 |  | October 31, 2017 |  | 0.75 |  |  | 0.75 |
June 30, 2017 |  | July 31, 2017 |  | 0.75 |  |  | 0.75 |
March 31, 2017 |  | April 28, 2017 |  | 0.75 |  |  | 0.75 |
December 31, 2016 |  | January 30, 2017 |  | 0.75 |  |  | 0.75 |
Schedule of Redeemable Interest in Property Partnerships [Table Text Block] | The following table reflects the activity of the noncontrolling interest—redeemable interest in property partnership in the Company’s Fountain Square consolidated entity for the year ended December 31, 2015 (in thousands):
Balance at December 31, 2014 | $ | 104,692 |
Net loss | (7 | )
Distributions | (2,900 | )
Adjustment to reflect redeemable interest at redemption value | 5,128 |
Acquisition of interest | (106,913 | )
Balance at December 31, 2015 | $ | — |
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, 2017, 2016 and 2015 (in thousands):
Balance at December 31, 2014 | $ | 1,602,467 |
Capital contributions | 3,758 |
Dissolution | (4,082 | )
Net income | 144,734 |
Accumulated other comprehensive loss | (2,428 | )
Distributions | (170,049 | )
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 loss | 47,832 |
Accumulated other comprehensive loss | (2,128 | )
Distributions | (54,176 | )
Balance at December 31, 2017 | $ | 1,683,760 |
Boston Properties, Inc. [Member] |
Entity Information [Line Items] |
Schedule Of Redeemable Preferred Units of the Operating Partnership | The following table reflects the activity of the noncontrolling interests—redeemable preferred units for the year ended December 31, 2015 (in thousands):
Balance at December 31, 2014 | $ | 633 |
Net income | 6 |
Distributions | (6 | )
Redemption of redeemable preferred units (Series Four Preferred Units) | (633 | )
Balance at December 31, 2015 | $ | — |
Boston Properties Limited Partnership |
Entity Information [Line Items] |
Schedule Of Redeemable Preferred Units of the Operating Partnership |
Balance at December 31, 2014 | $ | 633 |
Net income | 6 |
Distributions | (6 | )
Redemption of redeemable preferred units (Series Four Preferred Units) | (633 | )
Balance at December 31, 2015 | $ | — |
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, 2017, 2016 and 2015 (in thousands):
Balance at December 31, 2014 | $ | 2,310,046 |
Contributions | 39,030 |
Net income | 66,951 |
Distributions | (69,447 | )
Conversion of redeemable partnership units | (14,343 | )
Unearned compensation | (4,579 | )
Other comprehensive loss | (554 | )
Adjustment to reflect redeemable partnership units at redemption value | (40,415 | )
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 |
Noncontrolling Interests [Member] |
Entity Information [Line Items] |
Dividends Declared [Table Text Block] | :
Record Date |  | Payment Date |  | Distributions per OP Unit and LTIP Unit |  | Distributions per MYLTIP Unit
December 29, 2017 |  | January 30, 2018 |  |  | $0.80 |  |  |  | $0.080 |
September 29, 2017 |  | October 31, 2017 |  |  | $0.75 |  |  |  | $0.075 |
June 30, 2017 |  | July 31, 2017 |  |  | $0.75 |  |  |  | $0.075 |
March 31, 2017 |  | April 28, 2017 |  |  | $0.75 |  |  |  | $0.075 |
December 31, 2016 |  | January 30, 2017 |  |  | $0.75 |  |  |  | $0.075 |

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