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v3.21.2

Segment Information Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Write-off for accrued rent and accounts receivables | $ 0 | $ 7,500 | $ 1,300 | $ 63,800
Parking and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase (decrease) in parking and other revenue primarily related to COVID-19 | $ 7,200 |  | $ 4,000 |

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- Definition Increase (decrease) in parking and other revenue primarily related to COVID-19 + References No definition available. + Details
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Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=bxp_ParkingandOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |