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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Value of Leases acquired) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Accounting Policies [Abstract] |  |
Unamortized value of below market leases | $ 0.4 | $ 0.2
Unamortized value of in-place leases | $ 2.3 | $ 3.3

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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: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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