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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 | 1,118 cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired |
Purchase price of operating properties acquired | $ 225.0 cpt_SalesPriceOfPropertyPurchased |
Camden Fourth Ward [Member] [Domain] |  |
Business Acquisition [Line Items] |  |
Number of apartment units in wholly owned property acquired |  | 276 cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cpt_CamdenFourthWardMemberDomain
Purchase price of operating properties acquired |  | $ 62.6 cpt_SalesPriceOfPropertyPurchased / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cpt_CamdenFourthWardMemberDomain

X
- Definition Total number of apartment units associated with the property or properties acquired during the period. + References No definition available. + Details
Name: | cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sales price of property or properties purchased during the period. + References No definition available. + Details
Name: | cpt_SalesPriceOfPropertyPurchased
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cpt_CamdenFourthWardMemberDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |