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Subsequent Events (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended
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Sep. 16, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Valleybrooke Office Park [Member] | Oct. 24, 2014 Valleybrooke Office Park [Member] | Oct. 21, 2014 1919 Venture [Member] | Oct. 17, 2014 River Place [Member] | Oct. 17, 2014 River Place [Member] sqft Real_Estate_Investments | Oct. 21, 2014 Brandywine Realty Trust [Member] 1919 Venture [Member] | Oct. 17, 2014 Brandywine Realty Trust [Member] River Place [Member] | Oct. 21, 2014 LCOR/Calstrs [Member] 1919 Venture [Member] | Oct. 17, 2014 DRA Advisors LLC [Member] River Place [Member] | Oct. 16, 2014 2014 5.400% Notes Debt Instrument, Redemption [Member] | Oct. 16, 2014 2015 7.500% Notes Debt Instrument, Redemption [Member] | Oct. 16, 2014 Note Four and Five [Member] Debt Instrument, Redemption [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Consideration Of Sold Property |  |  |  |  |  |  | $ 37,900,000 |  |  |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  | 1,765,000 | 0 | 1,765,000 | 0 | 1,765,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Amount Of Participant Contribution |  |  |  |  |  |  |  |  |  |  |  |  | 8,200,000 |  |  |  |
General Partners' Contributed Capital |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |
Aggregate gross sales price of a joint venture |  |  |  |  |  |  |  | 16,400,000 |  |  |  |  |  |  |  |  |
Equity Method Investment, Short-term Loan |  |  |  |  |  |  |  |  | 88,000,000 |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Net Rentable Space |  |  |  |  |  |  |  |  |  | 591,000 |  |  |  |  |  |  |
Equity method investment, Consideration transferred |  |  |  |  |  |  |  |  | 128,100,000 |  |  |  |  |  |  |  |
Equity method investments, Cash contributions |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  | 20,000,000 |  |  |
Short-term Debt, Terms |  |  |  |  |  |  |  |  | 4.0% through December 31, 2014 (ii) 5.0% from January 1, 2015 through January 31, 2015, (iii) 7.0% from February 1, 2015 through February 28, 2015 and (iv) 9.0% from March 1, 2015 through March 31, 2015. |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,500,000 | 114,900,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.40% | 7.50% |
Repayments of Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 270,300,000
Loss on early extinguishment of debt | $ 2,606,000 | $ (2,606,000) | $ (11,000) | $ (2,606,000) | $ (1,127,000) |  |  |  |  |  |  |  |  |  |  |  | $ 4,900,000

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