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Non-controlling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Noncontrolling Interest [Line Items]                      
Number of fully consolidated joint ventures acquired                     13cpt_NumberOfFullyConsolidatedJointVenturesAcquired
Number of apartment units in property of which noncontrolling ownership interests were acquired                     680cpt_NumberOfApartmentUnitsInPropertyOfWhichNoncontrollingOwnershipInterestsWereAcquired
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
Increase in equity for conversion and redemption of operating partnership units                 52cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit 52cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit 8,994cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit
Decrease in additional paid-in-capital for acquisition of remaining non-controlling interests in three consolidated joint ventures                 0cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv 0cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv (19,549)cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv [2]
Change in common equity and net transfers from noncontrolling interests                 $ 292,141cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests $ 336,416cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests $ 272,835cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests
3 fully consolidated joint ventures acquired [Domain]                      
Noncontrolling Interest [Line Items]                      
Number of fully consolidated joint ventures acquired                     3cpt_NumberOfFullyConsolidatedJointVenturesAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= cpt_A3fullyconsolidatedjointventuresacquiredDomain
[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] During the year ended December 31, 2012, we purchased the remaining non-controlling ownership interest in three fully consolidated joint ventures, comprised of 680 units located in Houston, Texas and Charlotte, North Carolina.