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Noncontrolling Interests Redeemable Property Partnerships (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |
Beginning Balance | $ 104,692 | $ 99,609
Net Loss | (7) | (603)
Distributions | (2,900) | (6,000)
Adjustment to reflect redeemable partnership units at redemption value | 5,128 | 11,686
Acquisition of interest | (106,913) |
Ending Balance | $ 0 | $ 104,692

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- Definition Acquisition of interest + References No definition available. + Details
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Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 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

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInMinorityInterestRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration