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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 |  |  |  |  |  |  |  |  |  |  |  |  | 13 cpt_NumberOfFullyConsolidatedJointVenturesAcquired |
Number of apartment units in property of which noncontrolling ownership interests were acquired |  |  |  |  |  |  |  |  |  |  |  |  | 680 cpt_NumberOfApartmentUnitsInPropertyOfWhichNoncontrollingOwnershipInterestsWereAcquired |
Net income attributable to common shareholders | $ 178,498 us-gaap_NetIncomeLoss | $ 38,283 us-gaap_NetIncomeLoss | $ 35,272 us-gaap_NetIncomeLoss | $ 40,036 us-gaap_NetIncomeLoss | $ 129,996 us-gaap_NetIncomeLoss | $ 70,720 us-gaap_NetIncomeLoss | $ 72,172 us-gaap_NetIncomeLoss | $ 63,476 us-gaap_NetIncomeLoss | $ 292,089 us-gaap_NetIncomeLoss | [1] | $ 336,364 us-gaap_NetIncomeLoss | [1] | $ 283,390 us-gaap_NetIncomeLoss |
Increase in equity for conversion and redemption of operating partnership units |  |  |  |  |  |  |  |  | 52 cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit |  | 52 cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit |  | 8,994 cpt_NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit |
Decrease in additional paid-in-capital for acquisition of remaining non-controlling interests in three consolidated joint ventures |  |  |  |  |  |  |  |  | 0 cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv |  | 0 cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv |  | (19,549)cpt_DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv | [2]
Change in common equity and net transfers from noncontrolling interests |  |  |  |  |  |  |  |  | $ 292,141 cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests |  | $ 336,416 cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests |  | $ 272,835 cpt_ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests |
3 fully consolidated joint ventures acquired [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully consolidated joint ventures acquired |  |  |  |  |  |  |  |  |  |  |  |  | 3 cpt_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.

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