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Acquisitions, Dispositions, Impairment, Assets Held for Sale, and Discontinued Operations Acquisitions, Dispositions, impairment, Assets Held for Sale, and Discontinued Operations (Acquired properties) Table (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2013
Oct. 31, 2014
Business Acquisition [Line Items]    
Number of apartment units in wholly owned property acquired 1,118cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired  
Purchase price of operating properties acquired $ 225.0cpt_SalesPriceOfPropertyPurchased  
Camden Fourth Ward [Member] [Domain]    
Business Acquisition [Line Items]    
Number of apartment units in wholly owned property acquired   276cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cpt_CamdenFourthWardMemberDomain
Purchase price of operating properties acquired   $ 62.6cpt_SalesPriceOfPropertyPurchased
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cpt_CamdenFourthWardMemberDomain