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Properties, net (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012
Properties
Impairment losses	$ 2,354	$ 6,587	$ 8,941
Non-operating properties
Properties
Impairment losses	0	(5,246)	(5,246)
Operating properties, net
Properties
Impairment losses	$ 2,354	$ 11,833	$ 14,187

X

- Definition

The charge against earnings from continuing and noncontinuing operations resulting from the aggregate write down of all assets from their carrying value to their fair value.

+ References

No definition available.

+ Details

Name:	ofc_AssetImpairmentChargesContinuingAndNoncontinuingOperationsIncludingExitCosts
Namespace Prefix:	ofc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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