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Real Estate Joint Ventures (Details) (USD $) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2012 Property Venture | Jun. 30, 2011 | Jun. 30, 2012 Venture | Jun. 30, 2011 | Dec. 31, 2011
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Investment Balance | $ (6,282,000) |  |  | $ (6,282,000) |  |  | $ (6,071,000) |
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 | (6,282,000) | [1] |  | (6,282,000) | [1] |  | (6,071,000) | [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 or the equity in the joint venture | 5,200,000 |  |  | 5,200,000 |  |  | 5,200,000 |
Condensed balance sheets for unconsolidated real estate joint venture |  |  |  |  |  |  |  |
Properties, net | 58,891,000 |  |  | 58,891,000 |  |  | 59,792,000 |
Other assets | 4,242,000 |  |  | 4,242,000 |  |  | 3,529,000 |
Total assets | 63,133,000 |  |  | 63,133,000 |  |  | 63,321,000 |
Liabilities (primarily debt) | 68,581,000 |  |  | 68,581,000 |  |  | 67,710,000 |
Owners' equity | (5,448,000) |  |  | (5,448,000) |  |  | (4,389,000) |
Total liabilities and owners' equity | 63,133,000 |  |  | 63,133,000 |  |  | 63,321,000 |
Condensed statements of operations for unconsolidated real estate joint venture |  |  |  |  |  |  |  |
Revenues | 1,825,000 |  | 1,890,000 | 3,719,000 |  | 3,814,000 |  |
Property operating expenses | (724,000) |  | (979,000) | (1,461,000) |  | (1,965,000) |  |
Interest expense | (1,028,000) |  | (988,000) | (2,153,000) |  | (1,999,000) |  |
Depreciation and amortization expense | (594,000) |  | (567,000) | (1,164,000) |  | (1,175,000) |  |
Net loss | (521,000) |  | (644,000) | (1,059,000) |  | (1,325,000) |  |
LW Redstone Company, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) | 85.00% | [3] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 61,464,000 | [3],[4] |  | 61,464,000 | [3],[4] |  |  |
Pledged Assets | 16,141,000 | [3],[4] |  | 16,141,000 | [3],[4] |  |  |
Total Liabilities | 11,758,000 | [3],[4] |  | 11,758,000 | [3],[4] |  |  |
M Square Associates, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) | 50.00% | [5] |  |  |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 2 |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 60,126,000 | [4],[5] |  | 60,126,000 | [4],[5] |  |  |
Pledged Assets | 48,029,000 | [4],[5] |  | 48,029,000 | [4],[5] |  |  |
Total Liabilities | 43,584,000 | [4],[5] |  | 43,584,000 | [4],[5] |  |  |
Arundel Preserve 5, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) | 50.00% | [6] |  |  |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 1 |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 34,694,000 | [4],[6] |  | 34,694,000 | [4],[6] |  |  |
Pledged Assets | 33,582,000 | [4],[6] |  | 33,582,000 | [4],[6] |  |  |
Total Liabilities | 17,716,000 | [4],[6] |  | 17,716,000 | [4],[6] |  |  |
COPT-FD Indian Head, LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) | 75.00% | [7] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 6,537,000 | [4],[7] |  | 6,537,000 | [4],[7] |  |  |
MOR Forbes 2 LLC |  |  |  |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |  |  |  |
Ownership (as a percent) | 50.00% | [8] |  |  |  |  |  |
Number of buildings operated by the joint venture |  |  |  | 1 |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 3,787,000 | [4],[8] |  | 3,787,000 | [4],[8] |  |  |
Total Liabilities | 50,000 | [4],[8] |  | 50,000 | [4],[8] |  |  |
Consolidated real estate joint ventures |  |  |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |
Total Assets | 166,608,000 | [4] |  | 166,608,000 | [4] |  |  |
Pledged Assets | 97,752,000 | [4] |  | 97,752,000 | [4] |  |  |
Total Liabilities | $ 73,108,000 | [4] |  | $ 73,108,000 | [4] |  |  |
[1] | The carrying amount of our investment in this joint venture was lower than our share of the equity in the joint venture by $5.2 million at June 30, 2012 and December 31, 2011 due to our deferral of gain on the contribution by us of real estate into the joint venture upon its formation. A difference will continue to exist to the extent the nature of our continuing involvement in the joint venture remains the same.
[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 15).
[3] | This joint venture’s property is in Huntsville, Alabama.
[4] | Excludes amounts eliminated in consolidation.
[5] | This joint venture’s properties are in College Park, Maryland (in the Suburban Maryland region).
[6] | This joint venture’s property is in Hanover, Maryland (in the Baltimore/Washington Corridor).
[7] | This joint venture’s property is in Charles County, Maryland.
[8] | This joint venture’s property is in Lanham, Maryland (in the Suburban Maryland region).

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- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=d3e113969-111729 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6226653-111729 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5710-111685 + Details
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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=6970148&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R) -Paragraph C6 -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 3: 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=6970148&loc=d3e5747-111685 + 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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