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Segment Information Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Parking and Other [Member]
Segment Reporting Information [Line Items]
Increase (decrease) in parking and other revenue primarily related to COVID-19	$ 12,100	$ 16,900

X

- Definition

Increase (decrease) in parking and other revenue primarily related to COVID-19

+ References

No definition available.

+ Details

Name:	bxp_IncreaseDecreaseInParkingAndOtherRevenuePrimarilyRelatedToCOVID19
Namespace Prefix:	bxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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