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Properties, net (Details 3) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 19, 2015 | Mar. 31, 2015 | Mar. 19, 2015 sqft
Business Acquisition [Line Items] |  |  |
Weighted average useful life |  | 10 years |
Tenant relationship value |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life |  | 8 years |
250 W Pratt St | Baltimore, Maryland |  |  |
Business Acquisition [Line Items] |  |  |
Square footage of real estate properties (in square feet) | 367,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 367,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Acquired property percentage leased | 96.20%ofc_AcquiredPropertyPercentageLeased / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 96.20%ofc_AcquiredPropertyPercentageLeased / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Total acquisition cost | $ 61,900,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  |
Land | 8,057,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 8,057,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Building and improvements | 34,740,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 34,740,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Intangible assets on real estate acquisitions | 20,183,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 20,183,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Total assets | 62,980,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 62,980,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Below-market leases | (1,093,000)ofc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | (1,093,000)ofc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Total acquisition cost | 61,887,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  | 61,887,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember
Finite-lived intangible assets acquired | 20,183,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  |
Weighted average useful life | 8 years |  |
Operating property acquisition costs |  | 1,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |
250 W Pratt St | Baltimore, Maryland | Tenant relationship value |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired | 7,252,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  |
Weighted average useful life | 11 years |  |
250 W Pratt St | Baltimore, Maryland | In-place lease value |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired | 10,218,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  |
Weighted average useful life | 7 years |  |
250 W Pratt St | Baltimore, Maryland | Above market leases |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 2,713,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ofc_A250WPrattStMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember / us-gaap_StatementGeographicalAxis = ofc_BaltimoreMarylandMember |  |
Weighted average useful life | 4 years |  |

X
- Definition The percentage of acquired property that is leased at the time of acquisition, expressed as a percent. + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below-market Leases + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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