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Operating Partnerships Operating Partnerships (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 29, 2012
Write off of original issuance costs of redeemed perpetual preferred units $ 0cpt_WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits $ 0cpt_WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits $ 2,075,000cpt_WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits  
Camden Operating L P [Member]        
Percentage Of Real Estate Properties Held With Operating Partnership 8.00%cpt_PercentageOfRealEstatePropertiesHeldWithOperatingPartnership
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
     
Units of Partnership Interest, Amount 11.9us-gaap_UnitsOfPartnershipInterestAmount
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
     
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 92.20%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
     
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 1.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
     
Limited Partners' Capital Account, Units Outstanding 0.8us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
     
Partners' Capital Account, Units, Redeemed       4.0us-gaap_PartnersCapitalAccountUnitsRedeemed
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
Preferred Stock, Dividend Rate, Percentage       7.00%us-gaap_PreferredStockDividendRatePercentage
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
Temporary Equity, Redemption Price Per Share       $ 25.00us-gaap_TemporaryEquityRedemptionPricePerShare
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
Stock Redeemed or Called During Period, Value       100,000,000us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
Write off of original issuance costs of redeemed perpetual preferred units       $ 2,100,000cpt_WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits
/ dei_LegalEntityAxis
= cpt_CamdenOperatingLPMember
Camden Summit Partnership L P [Member]        
Percentage Of Real Estate Properties Held With Operating Partnership 30.00%cpt_PercentageOfRealEstatePropertiesHeldWithOperatingPartnership
/ dei_LegalEntityAxis
= cpt_CamdenSummitPartnershipLPMember
     
Units of Partnership Interest, Amount 22.8us-gaap_UnitsOfPartnershipInterestAmount
/ dei_LegalEntityAxis
= cpt_CamdenSummitPartnershipLPMember
     
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 94.20%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ dei_LegalEntityAxis
= cpt_CamdenSummitPartnershipLPMember
     
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 1.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= cpt_CamdenSummitPartnershipLPMember
     
Limited Partners' Capital Account, Units Outstanding 1.1us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= cpt_CamdenSummitPartnershipLPMember