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Shareholders' Equity (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2011 | Nov. 30, 2010 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Liquidation Preference |  |  | $ 216,333,000 |  |  |  | $ 216,333,000 |  |  |  | $ 216,333,000 | $ 216,333,000 |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued to the public (in shares) | 4,600,000 | 7,475,000 |  |  |  |  |  |  |  |  | 4,600,000 | 7,475,000 | 2,990,000
Per share value of common shares issued to the public (in dollars per share) | $ 33.00 | $ 34.25 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issue of shares after underwriter discounts but before offering expenses | 145,700,000 | 245,800,000 |  |  |  |  |  |  |  |  |  |  |
Number of operating partnership units converted into common shares (in units) |  |  |  |  |  |  |  |  |  |  | 100,939 | 663,498 | 2,841,394
Number of common shares for each converted common unit (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |
Dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.65 | $ 1.61 | $ 1.53
Accumulated other comprehensive loss activity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | (4,163,000) |  |  |  | (1,907,000) | (4,163,000) | (1,907,000) | (4,749,000)
Amount of loss recognized in AOCL (effective portion) |  |  |  |  |  |  |  |  |  |  | (31,531,000) | (5,473,000) | (3,253,000)
Amount of loss reclassified from AOCL to income (effective portion) |  |  |  |  |  |  |  |  |  |  | 4,601,000 | 3,689,000 | 6,680,000
Amount of loss reclassified from AOCL to loss on interest rate derivatives upon discontinuing hedge accounting |  |  |  |  |  |  |  |  |  |  | 28,430,000 |  |
Adjustment to AOCL attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 930,000 | (472,000) | (585,000)
Ending balance |  |  | (1,733,000) |  |  |  | (4,163,000) |  |  |  | (1,733,000) | (4,163,000) | (1,907,000)
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  | (87,215,000) | 7,470,000 | (26,007,000) | (18,566,000) | 16,752,000 | 8,926,000 | 9,151,000 | 10,675,000 | (124,318,000) | 45,504,000 | 61,299,000
Amount of loss recognized in AOCL |  |  |  |  |  |  |  |  |  |  | (31,531,000) | (5,473,000) | (3,253,000)
Amount of loss reclassified from AOCL to income (effective portion) |  |  |  |  |  |  |  |  |  |  | 4,601,000 | 3,689,000 | 6,680,000
Amount of loss reclassified from AOCL to loss on interest rate derivatives upon discontinuing hedge accounting |  |  |  |  |  |  |  |  |  |  | 28,430,000 |  |
Total comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | (122,818,000) | 43,720,000 | 64,726,000
Net loss (income) attributable to noncontrolling interests |  |  | 4,988,000 | (904,000) | 1,783,000 | 776,000 | (1,228,000) | (94,000) | (685,000) | (737,000) | 6,643,000 | (2,744,000) | (4,970,000)
Other comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (16,000) | 153,000 | (349,000)
Total comprehensive (loss) income attributable to COPT |  |  |  |  |  |  |  |  |  |  | (116,191,000) | 41,129,000 | 59,407,000
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 8,121,667 |  |  |  |  |  |  |  | 8,121,667 |  |
Number of preferred shares of beneficial interest authorized (in shares) |  |  | 15,000,000 |  |  |  |  |  |  |  | 15,000,000 |  |
Par value of preferred shares of beneficial interest authorized (in dollars per share) |  |  | $ 0.01 |  |  |  |  |  |  |  | $ 0.01 |  |
Series G |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 2,200,000 |  |  |  |  |  |  |  | 2,200,000 |  |
Aggregate Liquidation Preference |  |  | 55,000,000 |  |  |  |  |  |  |  | 55,000,000 |  |
Annual Dividend Yield |  |  |  |  |  |  |  |  |  |  | 8.00% |  |
Annual Dividend Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 2.00000 |  |
Series H |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 2,000,000 |  |  |  |  |  |  |  | 2,000,000 |  |
Aggregate Liquidation Preference |  |  | 50,000,000 |  |  |  |  |  |  |  | 50,000,000 |  |
Annual Dividend Yield |  |  |  |  |  |  |  |  |  |  | 7.50% |  |
Annual Dividend Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.87500 |  |
Series J |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 3,390,000 |  |  |  |  |  |  |  | 3,390,000 |  |
Aggregate Liquidation Preference |  |  | 84,750,000 |  |  |  |  |  |  |  | 84,750,000 |  |
Annual Dividend Yield |  |  |  |  |  |  |  |  |  |  | 7.625% |  |
Annual Dividend Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.90625 |  |
Series K |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 531,667 |  |  |  |  |  |  |  | 531,667 |  |
Aggregate Liquidation Preference |  |  | $ 26,583,000 |  |  |  |  |  |  |  | $ 26,583,000 |  |
Annual Dividend Yield |  |  |  |  |  |  |  |  |  |  | 5.60% |  |
Annual Dividend Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 2.80000 |  |
Number of common shares to be issued on conversion of each preferred share |  |  | 0.8163 |  |  |  |  |  |  |  | 0.8163 |  |

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