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Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2015 USD ($)
Noncontrolling Interest Redeemable Property Partnership [Abstract] |
Beginning Balance | $ 104,692
Net loss | (24)
Distributions | (2,900)
Adjustment to Reflect Redeemable Interest at Redemption Value | 4,465
Ending Balance | $ 106,233

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- Definition Adjustment to Reflect Redeemable Interest at Redemption Value + References No definition available. + Details
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Balance Type: | credit
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- Definition Distributions on Redeemable Property Partnership + 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 Net Loss for Redeemable interest in Property Partnership + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Noncontrolling Interest Redeemable Property Partnership [Abstract] + References No definition available. + Details
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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
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Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant