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Share-Based Compensation and Benefit Plans (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 375,316us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 183,871us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 468,839us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Total compensation cost for option and share awards $ 16,000,000cpt_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod $ 14,700,000cpt_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod $ 13,700,000cpt_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod  
Document Fiscal Year Focus 2014      
Total capitalized compensation cost for option and share awards 2,700,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 2,200,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 1,400,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount  
Percentage Of Market Value Per Share At Which Shares Purchased Under Employee Share Purchase Plan 85.00%cpt_PercentageOfMarketValueatWhichSharesPurchasedUnderEmployeeSharePurchasePlan      
Employee Share Purchase Plan, Maximum Authorized Amount Per Participant 25,000cpt_EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant      
Share Awards Held In Employee Trust Shares 1,800,000cpt_ShareAwardsHeldInEmployeeTrustShares 1,900,000cpt_ShareAwardsHeldInEmployeeTrustShares    
Share Awards Held In Non Qualified Deferred Compensation Plan Shares 43,700,000cpt_TradingSecuritiesHeldInEmployeeTrustValue 41,300,000cpt_TradingSecuritiesHeldInEmployeeTrustValue    
Cash Required By Plan Participants Upon Withdrawal 24,700,000cpt_CashRequiredByPlanParticipantsUponWithdrawal 25,400,000cpt_CashRequiredByPlanParticipantsUponWithdrawal    
Granted, Options Outstanding 84,452us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Share Awards Held In Non Qualified Deferred Compensation Plan Shares 1,200,000cpt_ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares 1,200,000cpt_ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares    
Trading Securities Held In Non Qualified Deferred Compensation Plan Value 27,700,000cpt_TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue 18,100,000cpt_TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue    
Defined Contribution Plan, Cost Recognized 2,200,000us-gaap_DefinedContributionPlanCostRecognized 2,200,000us-gaap_DefinedContributionPlanCostRecognized 2,200,000us-gaap_DefinedContributionPlanCostRecognized  
Options [Member]        
Allocated Share-based Compensation Expense 300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 400,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
200,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Total intrinsic value of options exercised during the period 7,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
5,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
12,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Remaining weighted average contractual life (years) outstanding options 4 years 1 month 5 days      
Remaining weighted average contractual life (years) exercisable options 4 years 1 month 5 days      
Share Awards and Vesting [Member]        
Total unrecognized compensation cost related to unvested options which is expected to be amortized 35,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= cpt_ShareAwardsAndVestingMember
     
Fair value of shares vested $ 17,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= cpt_ShareAwardsAndVestingMember
$ 15,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= cpt_ShareAwardsAndVestingMember
$ 13,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= cpt_ShareAwardsAndVestingMember
 
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Minimum [Member] | Options [Member]        
Vesting period, years 3 years      
Minimum [Member] | Share Awards and Vesting [Member]        
Vesting period, years 3 years      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Maximum [Member] | Options [Member]        
Vesting period, years 5 years      
Maximum [Member] | Share Awards and Vesting [Member]        
Vesting period, years 5 years      
2011 Share Incentive Plan [Member]        
Total fungible units to be issued 5,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
    9,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Units available under the 2011 Share Plan       5,800,000cpt_NumberOfFungibleUnitAuthorizedToIssueUnderShareBasedCompensationPlan
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Fungible units transferred from the 2002 Share Plan to the 2011 Share Plan       3,300,000cpt_NumberOfFungibleUnitAuthorizedToIssueUnderShareBasedCompensationPlans
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Fungible Units To Full Value Award Conversion Ratio       3.45cpt_FungibleUnitsToFullValueAwardConversionRatio
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Full Value award in the fungible unit conversion ratio       1.0cpt_FullValueawardinthefungibleunitconversionratio
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Expiration value of option right or other award       0.83cpt_ExpirationValueOfOptionRightOrOtherAward
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember
Common shares which could be granted pursuant to full value awards 1,600,000cpt_CommonSharesWhichCouldBeGrantedPursuantToFullValueAwards
/ us-gaap_PlanNameAxis
= cpt_TwoThousandElevenShareIncentivePlanMember