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Quarterly Financial Data (Unaudited) Quarterly Financial Data (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2014
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Document Period End Date                   Dec. 31, 2014    
Revenues   $ 216,459us-gaap_RealEstateRevenueNet $ 213,098us-gaap_RealEstateRevenueNet $ 208,492us-gaap_RealEstateRevenueNet $ 205,929us-gaap_RealEstateRevenueNet $ 204,317us-gaap_RealEstateRevenueNet $ 199,740us-gaap_RealEstateRevenueNet $ 194,983us-gaap_RealEstateRevenueNet $ 189,811us-gaap_RealEstateRevenueNet $ 843,978us-gaap_RealEstateRevenueNet [1] $ 788,851us-gaap_RealEstateRevenueNet [1] $ 698,318us-gaap_RealEstateRevenueNet
Net income attributable to common shareholders   178,498us-gaap_NetIncomeLoss 38,283us-gaap_NetIncomeLoss 35,272us-gaap_NetIncomeLoss 40,036us-gaap_NetIncomeLoss 129,996us-gaap_NetIncomeLoss 70,720us-gaap_NetIncomeLoss 72,172us-gaap_NetIncomeLoss 63,476us-gaap_NetIncomeLoss 292,089us-gaap_NetIncomeLoss [1] 336,364us-gaap_NetIncomeLoss [1] 283,390us-gaap_NetIncomeLoss
Total earnings per common share - basic   $ 1.99us-gaap_EarningsPerShareBasic [2] $ 0.43us-gaap_EarningsPerShareBasic [3] $ 0.40us-gaap_EarningsPerShareBasic [4] $ 0.45us-gaap_EarningsPerShareBasic [5] $ 1.47us-gaap_EarningsPerShareBasic [6] $ 0.80us-gaap_EarningsPerShareBasic [7] $ 0.82us-gaap_EarningsPerShareBasic [8] $ 0.72us-gaap_EarningsPerShareBasic [9] $ 3.29us-gaap_EarningsPerShareBasic [1] $ 3.82us-gaap_EarningsPerShareBasic [1] $ 3.35us-gaap_EarningsPerShareBasic
Total earnings per common share - diluted   $ 1.98us-gaap_EarningsPerShareDiluted [2] $ 0.43us-gaap_EarningsPerShareDiluted [3] $ 0.40us-gaap_EarningsPerShareDiluted [4] $ 0.45us-gaap_EarningsPerShareDiluted [5] $ 1.46us-gaap_EarningsPerShareDiluted [6] $ 0.79us-gaap_EarningsPerShareDiluted [7] $ 0.81us-gaap_EarningsPerShareDiluted [8] $ 0.72us-gaap_EarningsPerShareDiluted [9] $ 3.27us-gaap_EarningsPerShareDiluted [1] $ 3.78us-gaap_EarningsPerShareDiluted [1] $ 3.30us-gaap_EarningsPerShareDiluted
Gain on sale of discontinued operations, net of tax           91,101us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 34,410us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 24,866us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 31,783us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 182,160us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 115,068us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share           $ 1.04us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.39us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.29us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.37us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare      
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share           $ 1.03us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.39us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.28us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.36us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare      
Gain (Loss) on Sale of Properties   155,680us-gaap_GainLossOnSaleOfProperties               155,700us-gaap_GainLossOnSaleOfProperties    
Income loss due to disposition of operating property per basic share   $ 1.76cpt_Incomelossduetodispositionofoperatingpropertyperbasicshare                    
Income loss due to disposition of operating property per diluted share   $ 1.73cpt_Incomelossduetodispositionofoperatingpropertyperdilutedshare                    
Incentive compensation expense as a result of joint venture restructuring   10,000cpt_Incentivecompensationexpenseasaresultofjointventurerestructuring                    
Income loss from incentive compensation expense resulting from joint venture restructuring per basic share   $ 0.11cpt_IncomelossfromincentivecompensationexpenseresultingfromJVrestructuringperbasicshare                    
Income loss from incentive compensation resulting from joint venture restructuring per diluted share   $ 0.11cpt_IncomelossfromincentivecompensationresultingfromJVrestructuringperdilutedshare                    
Impairment associated with land holdings       1,152us-gaap_ImpairmentOfRealEstate           1,152us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate
Income Loss From Impairment of land per basic share       $ 0.01cpt_IncomeLossFromImpairmentoflandperbasicshare                
Income Loss from impairment of land per diluted share       $ 0.01cpt_IncomeLossfromimpairmentoflandperdilutedshare                
Gain (loss) on sale of unconsolidated joint venture property 3,600cpt_GainLossOnSaleOfUnconsolidatedJvProperty       3,566cpt_GainLossOnSaleOfUnconsolidatedJvProperty 3,245cpt_GainLossOnSaleOfUnconsolidatedJvProperty   13,032cpt_GainLossOnSaleOfUnconsolidatedJvProperty        
Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Basic Share         $ 0.04cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare $ 0.04cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare   $ 0.15cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare        
Number of operating properties sold                   5cpt_NumberOfOperatingPropertiesSold 12cpt_NumberOfOperatingPropertiesSold 11cpt_NumberOfOperatingPropertiesSold
Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Diluted Share         $ 0.04cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare $ 0.04cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare   $ 0.15cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare        
Gain (loss) on disposition of land     $ 1,808cpt_Gainlossondispositionofland $ 1,447cpt_Gainlossondispositionofland           $ 3,600cpt_Gainlossondispositionofland $ 700cpt_Gainlossondispositionofland  
Income loss on disposition of land per basic share     $ 0.02cpt_Incomelossonsaleoflandperbasicshare $ 0.02cpt_Incomelossonsaleoflandperbasicshare                
Income loss on disposition of land per diluted share     $ 0.02cpt_Incomelossondispositionoflandperdilutedshare $ 0.02cpt_Incomelossondispositionoflandperdilutedshare                
Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]                        
Number of operating properties sold               14cpt_NumberOfOperatingPropertiesSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= cpt_Saleof14operatingpropertieswithinanunconsolidatedjointventureinMay2013Member		        
[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income per share amounts may not equal the total computed for the year.
[2] Includes a $155,680, or $1.76 basic and $1.73 diluted per share, impact related to the gain on sale of operating properties, and a $10,000, or $0.11 basic and diluted per share, impact related to incentive compensation expense as a result of joint venture restructuring.
[3] Includes a $1,808, or $0.02 basic and diluted per share, impact related to a gain on sale of land.
[4] Includes a $1,447, or $0.02 basic and diluted per share, impact related to a gain on sale of land, and a $1,152, or $0.01 basic and diluted per share, impact related to an impairment charge associated with land holdings
[5] Includes a $3,566, or $0.04 basic and diluted per share, impact related to our proportionate gain on sale of an operating property by each of our funds, which is included in equity in income of joint ventures.
[6] Includes a $91,101, or $1.04 basic and $1.03 diluted per share, impact related to the gain on sale of discontinued operations and a $3,245, or $0.04 basic and diluted per share, impact related to our proportionate gain on sale of two operating properties by one of our unconsolidated joint ventures included in equity in income of joint ventures.
[7] Includes an $34,410, or $0.39 basic and diluted per share, impact related to the gain on sale of discontinued operations.
[8] Includes a $24,866, or $0.29 basic and $0.28 diluted per share, impact related to the gain on sale of discontinued operations, and a $13,032, or $0.15 basic and diluted per share, impact related to our proportionate gain on sale of 14 joint venture communities included in equity in income of joint ventures.
[9] Includes a $31,783, or $0.37 basic and $0.36 diluted per share, impact related to the gain on sale of discontinued operations.