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Real Estate Joint Ventures (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 building venture | Dec. 31, 2010 | Dec. 31, 2009
Investments in real estate joint ventures |  |  |
Investment Balance | $ (6,071,000) | $ (5,545,000) |
Unconsolidated real estate joint ventures |  |  |
Investments in real estate joint ventures |  |  |
Number of unconsolidated real estate joint ventures the entity has an interest in | 1 |  |
Investment Balance | (6,071,000) | (5,545,000) |
Ownership (as a percent) | 20.00% |  |
Number of buildings operated by the joint venture | 16 |  |
Difference between carrying amount of investment and share of the equity in the joint venture | 5,200,000 | 5,200,000 |
Maximum exposure to loss | 0 |  |
Fees recognized from joint ventures for property management, construction and leasing services |  |  | 119,000,000
Condensed balance sheets for unconsolidated real estate joint venture |  |  |
Properties, net | 59,792,000 | 61,521,000 |
Other assets | 3,529,000 | 4,174,000 |
Total assets | 63,321,000 | 65,695,000 |
Liabilities (primarily debt) | 67,710,000 | 67,454,000 |
Owners' equity | (4,389,000) | (1,759,000) |
Total liabilities and owners' equity | 63,321,000 | 65,695,000 |
Condensed statements of operations for unconsolidated real estate joint venture |  |  |
Revenues | 7,577,000 | 8,405,000 | 9,031,000
Property operating expenses | (3,673,000) | (3,600,000) | (3,438,000)
Interest expense | (3,913,000) | (3,937,000) | (3,981,000)
Depreciation and amortization expense | (2,463,000) | (3,154,000) | (3,198,000)
Net loss | (2,472,000) | (2,286,000) | (1,586,000)
M Square Associates, LLC |  |  |
Investments in real estate joint ventures |  |  |
Number of buildings operated by the joint venture | 2 |  |
Investments in consolidated real estate joint ventures |  |  |
Ownership (as a percent) | 50.00% |  |
Total Assets | 59,941,000 |  |
Pledged Assets | 47,901,000 |  |
Total Liabilities | 44,265,000 |  |
LW Redstone Company, LLC |  |  |
Investments in consolidated real estate joint ventures |  |  |
Ownership (as a percent) | 85.00% |  |
Total Assets | 48,985,000 |  |
Total Liabilities | 9,014,000 |  |
Arundel Preserve 5, LLC |  |  |
Investments in real estate joint ventures |  |  |
Number of buildings operated by the joint venture | 1 |  |
Investments in consolidated real estate joint ventures |  |  |
Ownership (as a percent) | 50.00% |  |
Total Assets | 30,254,000 |  |
Pledged Assets | 29,353,000 |  |
Total Liabilities | 17,343,000 |  |
COPT-FD Indian Head, LLC |  |  |
Investments in consolidated real estate joint ventures |  |  |
Ownership (as a percent) | 75.00% |  |
Total Assets | 6,538,000 |  |
Total Liabilities | 2,000 |  |
MOR Forbes 2 LLC |  |  |
Investments in real estate joint ventures |  |  |
Number of buildings operated by the joint venture | 1 |  |
Investments in consolidated real estate joint ventures |  |  |
Ownership (as a percent) | 50.00% |  |
Total Assets | 3,884,000 |  |
Total Liabilities | 29,000 |  |
Consolidated real estate joint ventures |  |  |
Investments in consolidated real estate joint ventures |  |  |
Total Assets | 149,602,000 |  |
Pledged Assets | 77,254,000 |  |
Total Liabilities | $ 70,653,000 |  |

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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
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration