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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |
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Jun. 30, 2012 Discounted Cash Flow Valuation Technique [Member] | Jun. 30, 2012 Yield Analysis Valuation Technique [Member] | Jun. 30, 2013 Fair value measurement on a nonrecurring basis Significant Unobservable Inputs (Level 3) Properties,net | Jun. 30, 2012 Fair value measurement on a nonrecurring basis Significant Unobservable Inputs (Level 3) Properties,net
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |  |  |  |  |
Fair value on measurement date |  |  |  |  | $ 113,144 | [1],[2] | $ 202,250 | [1]
Discount rate | 11.00% | [3] |  |  |  |  |  |
Terminal capitalization rate | 9.00% | [3] |  |  |  |  |  |
Market rent growth rate | 3.00% | [3] |  |  |  |  |  |
Expense growth rate | 3.00% | [3] |  |  |  |  |  |
Yield |  |  | 12.00% | [3] |  |  |  |
Market rent rate (in dollars per square foot) |  |  | 8.50 | [3] |  |  |  |
Leasing costs (in dollars per square foot) |  |  | 20.00 | [3] |  |  |  |
[1] | Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[2] | This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness.
[3] | Only one value applied for this unobservable input.

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- Definition Represents the expense growth rate , used as an input to measure the fair value. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the leasing costs per square foot, used as an input to measure fair value. + References No definition available. + Details
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- Definition Represents the market rent growth rate, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsMarketRentGrowthRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the market rent rate, used as an input to measure fair value, per square foot, in dollars + References No definition available. + Details
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Data Type: | us-types:perUnitItemType
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- Definition Represents the terminal capitalization rate, used as an input to measure the fair value. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the yield, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsYield
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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