XML 83 R41.htm IDEA: XBRL DOCUMENT v3.2.0.727

Organization (Details) - Jun. 30, 2015 ft² in Millions	a ft² Property MW
Debt in default of payment terms | Northern Virginia | Wholly owned subsidiary
Investments in real estate
Number of real estate properties | Property	2
Operating office properties
Investments in real estate
Number of real estate properties | Property	179
Square footage of real estate properties (in square feet)	18.0
Office properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties | Property	12
Square footage of real estate properties (in square feet)	1.3
Land controlled for future development
Investments in real estate
Square footage of real estate properties (in square feet) | a	1,450
Developable square feet	17.7
Partially operational, wholesale data center
Investments in real estate
The expected stabilization critical load after completion of development (in megawatts) | MW	19.25

X

- Definition

The amount of square feet into which a land parcel is potentially developable.

+ References

No definition available.

+ Details

Name:	ofc_DevelopableSquareFeet
Namespace Prefix:	ofc_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the expected stabilization critical load after completion of development of the property. Critical load is the amount of megawatts of power made available for the exclusive use tenants in the property.

+ References

No definition available.

+ Details

Name:	ofc_ExpectedStabilizationCriticalLoad
Namespace Prefix:	ofc_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ofc_DebtinDefaultofPaymentTermsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=ofc_NorthernVirginiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ofc_WhollyOwnedSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ofc_RealEstatePropertiesStatusAxis=ofc_OperatingOfficePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ofc_RealEstatePropertiesStatusAxis=ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ofc_RealEstatePropertiesStatusAxis=ofc_LandControlledforFutureDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ofc_RealEstatePropertiesStatusAxis=ofc_PartiallyOperationalWholesaleDataCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: