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Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2015 USD ($)
Noncontrolling Interest Redeemable Property Partnership [Abstract] |
Beginning Balance | $ 104,692
Net income | 75
Distributions | (1,400)
Adjustment to Reflect Redeemable Interest at Redemption Value | 2,153
Ending Balance | $ 105,520

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- 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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- Definition Noncontrolling Interest Redeemable Property Partnership [Abstract] + References No definition available. + 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