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Real Estate Joint Ventures (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Investments in consolidated real estate joint ventures |  |  |  |
Amounts advanced to fund Huntsville infrastructure costs | $ 53,663,000 |  | $ 35,798,000 |
Investment Balance | 0 |  | (6,420,000) |
Gain on disposal | 0 |  | 0 | 2,452,000
LW Redstone Company, LLC |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) | 85.00% |  |  |
Number of buildings operated by the joint venture | 3 |  |  |
Total Assets | 132,170,000 | [1],[2] |  |
Encumbered Assets | 67,487,000 | [1],[2] |  |
Total Liabilities | 39,845,000 | [1],[2] |  |
Amounts advanced to fund Huntsville infrastructure costs | 44,100,000 |  |  |
Partner's capital account upon formation | 9,000,000 |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company | 85.00% |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners | 15.00% |  |  |
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value | 5 years |  |  |
Construction commencement threshold (in square feet) | 4,400,000 |  |  |
LW Redstone Company, LLC | Maximum |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) | 76,000,000 |  |  |
M Square Associates, LLC |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) | 50.00% |  |  |
Number of buildings operated by the joint venture | 2 |  |  |
Total Assets | 60,919,000 | [1],[3] |  |
Encumbered Assets | 48,705,000 | [1],[3] |  |
Total Liabilities | 41,009,000 | [1],[3] |  |
Percentage of residual amounts distributed to each member | 50.00% |  |  |
COPT-FD Indian Head, LLC |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) | 75.00% |  |  |
Total Assets | 6,436,000 | [1],[4] |  |
Total Liabilities | 0 | [1],[4] |  |
Consolidated real estate joint ventures |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Total Assets | 199,525,000 | [1] |  |
Encumbered Assets | 116,192,000 | [1] |  |
Total Liabilities | 80,854,000 | [1] |  |
Arundel Preserve 5, LLC |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) |  |  | 50.00% |
Arundel Preserve 5, LLC | Common Shares |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 221,501 |  |  |
Stock Issued During Period, Value, Acquisitions | 5,200,000 |  |  |
MOR Forbes 2 LLC |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) | 50.00% |  |  |
Unconsolidated real estate joint ventures |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Ownership (as a percent) |  |  | 20.00% |
Number of buildings operated by the joint venture |  |  | 16 |
Investment Balance |  |  | (6,400,000) |
Gain on disposal | 6,300,000 |  |  |
Difference between carrying amount of investment and share of the equity in the joint venture |  |  | 4,500,000 |
Condensed balance sheets for unconsolidated real estate joint venture |  |  |  |
Properties, net |  |  | 58,460,000 |
Other assets |  |  | 4,376,000 |
Total assets |  |  | 62,836,000 |
Liabilities (primarily debt) |  |  | 72,693,000 |
Owners' equity |  |  | (9,857,000) |
Total liabilities and owners' equity |  |  | 62,836,000 |
Condensed statements of operations for unconsolidated real estate joint venture |  |  |  |
Revenues | 6,519,000 |  | 7,316,000 | 7,577,000
Property operating expenses | (2,818,000) |  | (2,829,000) | (3,673,000)
Interest expense | (10,463,000) |  | (7,672,000) | (3,913,000)
Depreciation and amortization expense | (2,067,000) |  | (2,283,000) | (2,463,000)
Gain on early extinguishment of debt | 23,013,000 |  | 0 | 0
Net income (loss) | 14,184,000 |  | (5,468,000) | (2,472,000)
Unconsolidated real estate joint ventures | Nonrecourse loan guarantees of unconsolidated partnership | Nonrecourse mezzanine loan |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |
Nonrecourse Mezzanine Debt Balance, equity method joint venture | $ 5,600,000 |  |  |
[1] | Excludes amounts eliminated in consolidation.
[2] | This joint venture’s property is in Huntsville, Alabama.
[3] | This joint venture’s properties are in College Park, Maryland (in the Baltimore/Washington Corridor).
[4] | This joint venture’s property is in Charles County, Maryland. In 2012, the joint venture exercised its option under a development agreement to require Charles County to repurchase the land parcel at its original acquisition cost. Under the terms of the agreement with Charles County, the repurchase is expected to occur by August 2014.

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=28200181&loc=SL6759159-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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