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Fair Value of Financial Instruments (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Company's estimates of fair value differ from the carrying amounts
Mortgage payable, net of discounts, Carrying Amount	$ 588,823	$ 711,789
Mortgage payable, net of discounts, Fair Value	602,815	726,348
Unsecured notes payable, net of discounts, Carrying Amount	1,573,588	1,274,047
Unsecured notes payable, net of discounts, Fair Value	1,726,338	1,338,743
Variable Rate Debt Instruments, Carrying Amount	303,610	444,610
Variable Rate Debt Instruments, Fair Value	295,131	432,556
Notes Receivable, Carrying Amount	32,255	31,216
Notes Receivable, Fair Value	$ 29,995	$ 28,921

X

- Definition

Company's estimates of fair value differ from the carrying amounts.

+ Details

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Namespace Prefix:	bdn
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Balance Type:	na
Period Type:	duration

X

- Definition

Secured Debt Principal Balance Outstanding.

+ Details

Name:	bdn_SecuredDebtPrincipalBalanceOutstanding
Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Secured Debt Principal Balance Outstanding Fair Value Disclosure.

+ Details

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Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Unsecured notes payable, net of discounts, Carrying Amount.

+ Details

Name:	bdn_UnsecuredNotesPayableNetOfDiscountsCarryingAmount
Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Unsecured notes payable, net of discounts, Fair Value.

+ Details

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Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Variable Rate Debt Instruments, Carrying Amount.

+ Details

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Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Variable Rate Debt Instruments, Fair Value.

+ Details

Name:	bdn_VariableRateDebtInstrumentsFairValue
Namespace Prefix:	bdn
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph b
-Article 5

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 10
-Subparagraph 3
-Article 9

+ Details

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Balance Type:	debit
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