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Real Estate Joint Ventures (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 Venture | Sep. 30, 2012 | Sep. 30, 2013 Property Venture | Sep. 30, 2012 | Dec. 31, 2012
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Investment Balance | $ (6,420,000) |  |  | $ (6,420,000) |  |  | $ (6,420,000) |
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Investment Balance | (6,420,000) |  |  | (6,420,000) |  |  | (6,420,000) |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |  |  |  | 1,369,000 |  |  |  |
Unconsolidated real estate joint ventures |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Number of unconsolidated real estate joint ventures in which the entity has an interest | 1 |  |  | 1 |  |  |  |
Investment Balance | (6,420,000) | [1] |  | (6,420,000) | [1] |  | (6,420,000) | [1]
Ownership (as a percent) |  |  |  | 20.00% |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 16 |  |  |  |
Maximum exposure to loss | 0 | [2] |  | 0 | [2] |  |  |
Difference between carrying amount of investment and share of the equity in the joint venture | 3,000,000 |  |  | 3,000,000 |  |  | 4,500,000 |
Condensed balance sheets for unconsolidated real estate joint venture |  |  |  |  |  |  |  |
Properties, net | 57,222,000 |  |  | 57,222,000 |  |  | 58,460,000 |
Other assets | 6,248,000 |  |  | 6,248,000 |  |  | 4,376,000 |
Total assets | 63,470,000 |  |  | 63,470,000 |  |  | 62,836,000 |
Liabilities (primarily debt) | 80,424,000 |  |  | 80,424,000 |  |  | 72,693,000 |
Owners' equity | (16,954,000) |  |  | (16,954,000) |  |  | (9,857,000) |
Total liabilities and owners' equity | 63,470,000 |  |  | 63,470,000 |  |  | 62,836,000 |
Condensed statements of operations for unconsolidated real estate joint venture |  |  |  |  |  |  |  |
Revenues | 1,739,000 |  | 1,778,000 | 5,342,000 |  | 5,497,000 |  |
Property operating expenses | (755,000) |  | (758,000) | (2,250,000) |  | (2,219,000) |  |
Interest expense | (2,966,000) |  | (1,138,000) | (8,521,000) |  | (3,291,000) |  |
Depreciation and amortization expense | (575,000) |  | (568,000) | (1,668,000) |  | (1,732,000) |  |
Net loss | (2,557,000) |  | (686,000) | (7,097,000) |  | (1,745,000) |  |
Consolidated real estate joint ventures |  |  |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 185,599,000 | [3] |  | 185,599,000 | [3] |  |  |
Pledged Assets | 93,063,000 | [3] |  | 93,063,000 | [3] |  |  |
Total Liabilities | 63,694,000 | [3] |  | 63,694,000 | [3] |  |  |
LW Redstone Company, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 85.00% |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 114,141,000 | [3],[4] |  | 114,141,000 | [3],[4] |  |  |
Pledged Assets | 45,209,000 | [3],[4] |  | 45,209,000 | [3],[4] |  |  |
Total Liabilities | 22,141,000 | [3],[4] |  | 22,141,000 | [3],[4] |  |  |
M Square Associates, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 50.00% |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 2 |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 60,879,000 | [3],[5] |  | 60,879,000 | [3],[5] |  |  |
Pledged Assets | 47,854,000 | [3],[5] |  | 47,854,000 | [3],[5] |  |  |
Total Liabilities | 41,463,000 | [3],[5] |  | 41,463,000 | [3],[5] |  |  |
COPT-FD Indian Head, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 75.00% |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 6,447,000 | [3],[6] |  | 6,447,000 | [3],[6] |  |  |
MOR Forbes 2 LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 50.00% |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 1 |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 4,132,000 | [3],[7] |  | 4,132,000 | [3],[7] |  |  |
Total Liabilities | 90,000 | [3],[7] |  | 90,000 | [3],[7] |  |  |
Common Shares | Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) |  |  |  | 221,501 |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |  |  |  | 3,899,000 |  |  |  |
Common Shares | Arundel Preserve LLC |  |  |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) |  |  |  | 221,501 |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |  |  |  | $ 5,200,000 |  |  |  |
[1] | The carrying amount of our investment in this joint venture was lower than our share of the equity in the joint venture by $3.0 million at September 30, 2013 and $4.5 million at December 31, 2012 due to our deferral of gain on the contribution by us of real estate into the joint venture upon its formation and our discontinuance of loss recognition under the equity method effective October 2012, as discussed below. A difference will continue to exist to the extent the nature of our continuing involvement in the joint venture remains the same and we continue to no longer recognize income or losses under the equity method.
[2] | Derived from the sum of our investment balance and maximum additional unilateral capital contributions or loans required from us. Not reported above are additional amounts that we and our partner are required to fund when needed by this joint venture; these funding requirements are proportional to our respective ownership percentages. Also not reported above are additional unilateral contributions or loans from us, the amounts of which are uncertain, that we would be required to make if certain contingent events occur (see Note 17).
[3] | Excludes amounts eliminated in consolidation.
[4] | This joint venture’s property is in Huntsville, Alabama.
[5] | This joint venture’s properties are in College Park, Maryland (in the Suburban Maryland region).
[6] | 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.
[7] | This joint venture’s property is in Lanham, Maryland (in the Suburban Maryland region).

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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Period Type: | instant

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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=28200181&loc=SL6759159-111685 + Details
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Period Type: | duration