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Future Minimum Lease Payments for Capital Leases (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Leases [Abstract]
Lessee purchase option reasonably certain of exercising	$ 38,700

X

- Definition

Lessee purchase option reasonably certain of exercising

+ References

No definition available.

+ Details

Name:	bxp_LesseePurchaseOptionReasonablyCertainOfExercising
Namespace Prefix:	bxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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