XML 70 R53.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Noncontrolling Interests Property Partnerships (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Activity of Noncontrolling Interests [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | $ 1,530,647,000 |  |
Capital contributions |  |  | (147,772,000) |  | $ (6,737,000)
Net income | $ 14,340,000 | $ (17,225,000) | 33,967,000 |  | 53,000
Accumulated other comprehensive income (loss) | (300,000) | (1,097,000) | 2,220,000 |  | 23,011,000
Ending Balance | 1,668,675,000 |  | 1,668,675,000 |  |
Property Partnerships Member |  |  |  |  |
Activity of Noncontrolling Interests [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 1,530,647,000 |  | 1,574,400,000
Capital contributions |  |  | 147,772,000 | [1] | 5,417,000
Net income |  |  | 33,967,000 |  | 53,000
Accumulated other comprehensive income (loss) |  |  | (2,272,000) |  | (16,134,000)
Distributions |  |  | (41,439,000) |  | (38,694,000)
Ending Balance | 1,668,675,000 | $ 1,525,042,000 | 1,668,675,000 |  | $ 1,525,042,000
767 Fifth Avenue (the General Motors Building) | Property Partnerships Member |  |  |  |  |
Activity of Noncontrolling Interests [Roll Forward] |  |  |  |  |
Ending Balance | $ 109,576 |  | $ 109,576 |  |
[1] | Includes the contribution of the remaining unpaid principal balance of the members’ notes payable totaling $109,576 to equity in the consolidated entity that owns 767 Fifth Avenue (the General Motors Building).

X
- Definition Minority Interest Distributions Limited Partnerships. + References No definition available. + Details
Name: | bxp_MinorityInterestDistributionsLimitedPartnerships
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount of the equity interests owned by noncontrolling partners of a limited partnership included in the entity's consolidated financial statements. + References No definition available. + Details
Name: | us-gaap_MinorityInterestInLimitedPartnerships
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInMinorityInterestRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of income (loss) attributable to nonredeemable noncontrolling partner of a limited partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromMinorityShareholders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=bxp_PropertyPartnershipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_SevensixsevenfifthavenuethegeneralmotorsbuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |