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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 Misapplication Of Accounting Guidance Related To Recognition Of Deferred Tax Asset Scenario, Previously Reported | Mar. 31, 2012 Misapplication Of Accounting Guidance Related To Recognition Of Deferred Tax Asset Scenario, Adjustment | Jun. 30, 2012 Misapplication Of Accounting Guidance Related To Recognition Of Deferred Tax Asset Scenario, Adjustment | Dec. 31, 2011 Over accrual Of Incentive Compensation Cost Scenario, Previously Reported | Mar. 31, 2012 Over accrual Of Incentive Compensation Cost Scenario, Adjustment | Jun. 30, 2012 Over accrual Of Incentive Compensation Cost Scenario, Adjustment | Dec. 31, 2011 Misapplication of Accounting Guidance Related to Recognition of Deferred Tax Asset and Over Accrual of Incentive Compensation Cost [Member] Scenario, Previously Reported | Mar. 31, 2012 Misapplication of Accounting Guidance Related to Recognition of Deferred Tax Asset and Over Accrual of Incentive Compensation Cost [Member] Scenario, Adjustment | Jun. 30, 2012 Misapplication of Accounting Guidance Related to Recognition of Deferred Tax Asset and Over Accrual of Incentive Compensation Cost [Member] Scenario, Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 11,861 |  | $ (26,007) |  | $ 18,838 |  | $ (44,573) |  | $ 4,000 |  |  | $ (700) |  |  | $ 3,300 | $ (3,300) | $ (3,300)
Income tax (expense) benefit | 17 |  | (5,042) |  | 4,190 |  | (5,586) |  | (4,000) | 4,000 | 4,000 |  |  |  |  |  |
General and administrative expenses | $ 7,742 |  | $ 6,320 |  | $ 14,759 |  | $ 13,097 |  |  |  |  | $ 700 | $ (700) | $ (700) |  |  |
Earnings per share, basic | $ 0.09 | [1] | $ (0.42) | [1] | $ 0.13 | [1] | $ (0.75) | [1] | $ 0.05 | $ (0.05) | $ (0.05) | $ (0.01) | $ 0.01 | $ 0.01 | $ 0.04 | $ (0.04) | $ (0.04)
Earnings per share, diluted | $ 0.09 | [1] | $ (0.42) | [1] | $ 0.13 | [1] | $ (0.75) | [1] | $ 0.05 | $ (0.05) | $ (0.05) | $ (0.01) | $ 0.01 | $ 0.01 | $ 0.04 | $ (0.04) | $ (0.04)
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

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