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Acquisitions, Dispositions, Impairment, Assets Held for Sale, and Discontinued Operations (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Jul. 31, 2014
acre
Apr. 30, 2014
acre
Jan. 31, 2014
acre
Jun. 30, 2013
acre
Dec. 31, 2014
acre
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2014
acre
Dec. 31, 2013
acre
Dec. 31, 2012
Jan. 31, 2015
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]                      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual, included in Discontinued Operations                   $ 6,400,000cpt_BusinessCombinationProFormaInformationRevenueofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations  
Number of apartment units in wholly owned property acquired                 1,118cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired    
Business Combination Pro Forma Information Expenses of Acquiree since Acquisition Date, Actual included in Discontinued Operations                   3,100,000cpt_BusinessCombinationProFormaInformationExpensesofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations  
Pro Forma Property Revenues of Acquiree since Acquisition Date, Actual               800,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual 10,800,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual 52,800,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual  
Number of operating properties acquired               1cpt_NumberOfOperatingPropertiesAcquired 3cpt_NumberOfOperatingPropertiesAcquired 7cpt_NumberOfOperatingPropertiesAcquired  
Acres of land acquired   7.6cpt_AcresOfLandAcquired 2.9cpt_AcresOfLandAcquired 38.8cpt_AcresOfLandAcquired              
Purchase price of land acquired   23,800,000us-gaap_PaymentsToAcquireLand 15,600,000us-gaap_PaymentsToAcquireLand 25,800,000us-gaap_PaymentsToAcquireLand              
Purchase price of operating properties acquired                 225,000,000cpt_SalesPriceOfPropertyPurchased    
Pro Forma Property Expenses of Acquiree since Acquisition Date, Actual               300,000cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual 4,500,000cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual 21,000,000cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual  
Number of fully consolidated joint ventures acquired                   13cpt_NumberOfFullyConsolidatedJointVenturesAcquired  
Impairment associated with land holdings             1,152,000us-gaap_ImpairmentOfRealEstate 1,152,000us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate  
Gain (Loss) on Sale of Properties         155,680,000us-gaap_GainLossOnSaleOfProperties     155,700,000us-gaap_GainLossOnSaleOfProperties      
Proceeds from Sale of Land Held-for-investment 800,000us-gaap_ProceedsFromSaleOfLandHeldforinvestment             22,900,000us-gaap_ProceedsFromSaleOfLandHeldforinvestment      
Area of Land 2.4us-gaap_AreaOfLand       26.9us-gaap_AreaOfLand     26.9us-gaap_AreaOfLand 3.7us-gaap_AreaOfLand    
Gain (loss) on disposition of land           1,808,000cpt_Gainlossondispositionofland 1,447,000cpt_Gainlossondispositionofland 3,600,000cpt_Gainlossondispositionofland 700,000cpt_Gainlossondispositionofland    
Subsequent Event [Line Items]                      
Number of operating properties sold               5cpt_NumberOfOperatingPropertiesSold 12cpt_NumberOfOperatingPropertiesSold 11cpt_NumberOfOperatingPropertiesSold  
Number of apartment homes in operating properties sold               1,847cpt_NumberOfApartmentUnitsInPropertyDisposed 3,931cpt_NumberOfApartmentUnitsInPropertyDisposed 3,213cpt_NumberOfApartmentUnitsInPropertyDisposed  
Proceeds from Sale of Property Held-for-sale               218,300,000cpt_Proceedsfromsaleofoperatingproperties      
Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Number of operating properties sold                     2cpt_NumberOfOperatingPropertiesSold
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Number of apartment homes in operating properties sold                     1,116cpt_NumberOfApartmentUnitsInPropertyDisposed
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Proceeds from Sale of Property Held-for-sale                     $ 114,400,000cpt_Proceedsfromsaleofoperatingproperties
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