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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Annual dividends distribution percentage to shareholders to qualify as a REIT 90.00%cpt_AnnualDividendDistributionPercentageToShareholdersToQualifyAsRealEstateInvestmentTrust    
Significant temporary differences or tax credits associated with our taxable REIT subsidiaries $ 0us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfDomesticSubsidiaries    
Operating Loss Carryforwards 21,500,000us-gaap_OperatingLossCarryforwards    
Statement [Line Items]      
Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets 1,200,000,000cpt_DifferenceBetweenCarryValueOfNetAssetsAndTaxBasisOfNetAssets    
Income tax expense 1,903,000us-gaap_CurrentIncomeTaxExpenseBenefit 1,826,000us-gaap_CurrentIncomeTaxExpenseBenefit 1,208,000us-gaap_CurrentIncomeTaxExpenseBenefit
Uncertain tax positions or unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefits    
Minimum [Member]      
Statement [Line Items]      
Operating Loss Carryforwards, Expiration Dates Jan. 01, 2030    
Maximum [Member]      
Statement [Line Items]      
Operating Loss Carryforwards, Expiration Dates Jan. 01, 2034