v2.4.0.8

Segment Information Segment Information (narrative) (Details) (767 Fifth Avenue (The GM Building) [Member], Consolidated Properties [Member])	0 Months Ended
	May 31, 2013 partners
767 Fifth Avenue (The GM Building) [Member] | Consolidated Properties [Member]
Segment Reporting Information [Line Items]
Number of Joint Venture Partners	2

X

- Definition

Number of Joint Venture Partners

+ References

No definition available.

+ Details

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Namespace Prefix:	bxp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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