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Commitments and Contingencies (Details) (USD $) | 1 Months Ended |  | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2010 | Sep. 30, 2012 Property Y | Sep. 30, 2012 Nonrecourse loan guarantees of unconsolidated partnership | Sep. 30, 2012 Arundel Preserve 5, LLC, Date Acquired 7/2/2007 sqft acre
Joint Ventures |  |  |  |
Maximum approximate amount required to be paid under the guarantees |  |  | $ 65,000,000 |
Recovery percentage of amount paid under the guarantee when the entity continues to manage the properties |  |  | 20.00% |
Recovery percentage of amount paid under the guarantee when the entity no longer manages the properties |  |  | 80.00% |
Maximum amount of office space to be developed through the joint venture (in square feet) |  |  |  | 1,800,000
Land available to develop office space (in acres) |  |  |  | 63
Ownership (as a percent) |  |  |  | 50.00%
Tax incremental financing obligation |  |  |  |
The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland | 30,000,000 |  |  |
Liability recognized with regard to tax incremental financing obligation at end of current period |  | 3,600,000 |  |
Environmental Indemnity Agreement |  |  |  |
Number of lease properties which were provided environmental indemnifications |  | 3 |  |
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement |  | 5,000,000 |  |
Length of environmental indemnification to the tenant against consequential damages at a building after the tenant's acquisition of the property (in years) |  | 15 |  |
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property |  | 12,500,000 |  |
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) |  | 50.00% |  |
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  | 300,000 |  |
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  | $ 1,500,000 |  |

X
- Definition Represents the maximum annual additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties. + References No definition available. + Details
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- Definition Represents the percentage of additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties, subject to an annual and aggregate limits. + References No definition available. + Details
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- Definition Represents the maximum number of square feet of office space to be developed under joint venture. + References No definition available. + Details
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- Definition Represents the length, in years, of environmental indemnification to the tenant against consequential damages at a building (e.g., business interruption) after the tenant's acquisition of such building from the entity. + References No definition available. + Details
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- Definition Represents the maximum amount of environmental indemnification to the tenant against consequential damages after the acquisition of the property from the entity. + References No definition available. + Details
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- Definition Represents the maximum amount of environmental indemnification to the tenant against losses covered under an indemnity agreement of the prior owner of the property after the State of New Jersey declares the remediation complete. + References No definition available. + Details
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- Definition Represents the percentage of amounts paid under the guarantees that the entity is entitled to recover from an affiliate of the general partner of the partnership pursuant to an indemnity agreement so long as the entity continues to manage the partnership's properties. + References No definition available. + Details
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- Definition Represents the percentage of amounts paid under the guarantees that the entity is entitled to recover from an affiliate of the general partner of the partnership pursuant to an indemnity agreement if the entity no longer manages the partnership's properties. + References No definition available. + Details
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- Definition The bond amounts issued by Anne Arundel County, Maryland to third-party investors in order to finance public improvements needed in connection with National Business Park North. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6970148&loc=SL6759159-111685 + Details
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