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Summary Of Significant Accounting Policies and Recent Accounting Pronouncements Summary of Significant Accounting Policies Value of Leases acquired (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Value of leases acquired [Abstract]
Unamortized value of below market leases	$ 0.1	$ 0.2
Unamortized value of acquired in-place leases	$ 0.6	$ 3.2

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- Definition

Unamortized value of above or below market leases. This element represents the identifiable intangible asset established upon acquisition based on a favorable or unfavorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

+ References

No definition available.

+ Details

Name:	cpt_UnamortizedValueOfAboveOrBelowMarketLeases
Namespace Prefix:	cpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	cpt_ValueofleasesacquiredAbstract
Namespace Prefix:	cpt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant