v2.4.0.8

Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Noncontrolling Interest Redeemable Property Partnership [Abstract] |
Beginning Balance | $ 97,558
Net Loss for Redeemable interest in Property Partnership | (980)
Distributions on Redeemable Property Partnership | (2,950)
Adjustment to Reflect Redeemable Interest at Redemption Value | 4,534
Ending Balance | $ 98,162

X
- Definition Adjustment to Reflect Redeemable Interest at Redemption Value + References No definition available. + Details
Name: | bxp_AdjustmentToReflectRedeemableInterestAtRedemptionValue
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Distributions on Redeemable Property Partnership + References No definition available. + Details
Name: | bxp_DistributionsOnRedeemablePropertyPartnership
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net Loss for Redeemable interest in Property Partnership + References No definition available. + Details
Name: | bxp_NetLossForRedeemableInterestInPropertyPartnership
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | bxp_NoncontrollingInterestRedeemablePropertyPartnershipAbstract
Namespace Prefix: | bxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Temporary Equity, Carrying Amount Redeemable Interest in Property Partnerships + References No definition available. + Details
Name: | bxp_TemporaryEquityCarryingAmountRedeemableInterestInPropertyPartnerships
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant