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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
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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 |  | $ 216,459 us-gaap_RealEstateRevenueNet |  | $ 213,098 us-gaap_RealEstateRevenueNet |  | $ 208,492 us-gaap_RealEstateRevenueNet |  | $ 205,929 us-gaap_RealEstateRevenueNet |  | $ 204,317 us-gaap_RealEstateRevenueNet |  | $ 199,740 us-gaap_RealEstateRevenueNet |  | $ 194,983 us-gaap_RealEstateRevenueNet |  | $ 189,811 us-gaap_RealEstateRevenueNet |  | $ 843,978 us-gaap_RealEstateRevenueNet | [1] | $ 788,851 us-gaap_RealEstateRevenueNet | [1] | $ 698,318 us-gaap_RealEstateRevenueNet
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
Total earnings per common share - basic |  | $ 1.99 us-gaap_EarningsPerShareBasic | [2] | $ 0.43 us-gaap_EarningsPerShareBasic | [3] | $ 0.40 us-gaap_EarningsPerShareBasic | [4] | $ 0.45 us-gaap_EarningsPerShareBasic | [5] | $ 1.47 us-gaap_EarningsPerShareBasic | [6] | $ 0.80 us-gaap_EarningsPerShareBasic | [7] | $ 0.82 us-gaap_EarningsPerShareBasic | [8] | $ 0.72 us-gaap_EarningsPerShareBasic | [9] | $ 3.29 us-gaap_EarningsPerShareBasic | [1] | $ 3.82 us-gaap_EarningsPerShareBasic | [1] | $ 3.35 us-gaap_EarningsPerShareBasic
Total earnings per common share - diluted |  | $ 1.98 us-gaap_EarningsPerShareDiluted | [2] | $ 0.43 us-gaap_EarningsPerShareDiluted | [3] | $ 0.40 us-gaap_EarningsPerShareDiluted | [4] | $ 0.45 us-gaap_EarningsPerShareDiluted | [5] | $ 1.46 us-gaap_EarningsPerShareDiluted | [6] | $ 0.79 us-gaap_EarningsPerShareDiluted | [7] | $ 0.81 us-gaap_EarningsPerShareDiluted | [8] | $ 0.72 us-gaap_EarningsPerShareDiluted | [9] | $ 3.27 us-gaap_EarningsPerShareDiluted | [1] | $ 3.78 us-gaap_EarningsPerShareDiluted | [1] | $ 3.30 us-gaap_EarningsPerShareDiluted
Gain on sale of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | 91,101 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 34,410 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 24,866 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 31,783 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 182,160 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 115,068 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share |  |  |  |  |  |  |  |  |  | $ 1.04 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.39 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.29 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.37 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share |  |  |  |  |  |  |  |  |  | $ 1.03 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ 0.39 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ 0.28 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ 0.36 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  | 155,680 us-gaap_GainLossOnSaleOfProperties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 155,700 us-gaap_GainLossOnSaleOfProperties |  |  |  |
Income loss due to disposition of operating property per basic share |  | $ 1.76 cpt_Incomelossduetodispositionofoperatingpropertyperbasicshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income loss due to disposition of operating property per diluted share |  | $ 1.73 cpt_Incomelossduetodispositionofoperatingpropertyperdilutedshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive compensation expense as a result of joint venture restructuring |  | 10,000 cpt_Incentivecompensationexpenseasaresultofjointventurerestructuring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income loss from incentive compensation expense resulting from joint venture restructuring per basic share |  | $ 0.11 cpt_IncomelossfromincentivecompensationexpenseresultingfromJVrestructuringperbasicshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income loss from incentive compensation resulting from joint venture restructuring per diluted share |  | $ 0.11 cpt_IncomelossfromincentivecompensationresultingfromJVrestructuringperdilutedshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment associated with land holdings |  |  |  |  |  | 1,152 us-gaap_ImpairmentOfRealEstate |  |  |  |  |  |  |  |  |  |  |  | 1,152 us-gaap_ImpairmentOfRealEstate |  | 0 us-gaap_ImpairmentOfRealEstate |  | 0 us-gaap_ImpairmentOfRealEstate
Income Loss From Impairment of land per basic share |  |  |  |  |  | $ 0.01 cpt_IncomeLossFromImpairmentoflandperbasicshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Loss from impairment of land per diluted share |  |  |  |  |  | $ 0.01 cpt_IncomeLossfromimpairmentoflandperdilutedshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of unconsolidated joint venture property | 3,600 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  |  |  |  |  |  | 3,566 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  | 3,245 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  |  |  | 13,032 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  |  |  |  |  |  |  |
Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Basic Share |  |  |  |  |  |  |  | $ 0.04 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare |  | $ 0.04 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare |  |  |  | $ 0.15 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 cpt_NumberOfOperatingPropertiesSold |  | 12 cpt_NumberOfOperatingPropertiesSold |  | 11 cpt_NumberOfOperatingPropertiesSold
Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Diluted Share |  |  |  |  |  |  |  | $ 0.04 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare |  | $ 0.04 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare |  |  |  | $ 0.15 cpt_IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare |  |  |  |  |  |  |  |
Gain (loss) on disposition of land |  |  |  | $ 1,808 cpt_Gainlossondispositionofland |  | $ 1,447 cpt_Gainlossondispositionofland |  |  |  |  |  |  |  |  |  |  |  | $ 3,600 cpt_Gainlossondispositionofland |  | $ 700 cpt_Gainlossondispositionofland |  |
Income loss on disposition of land per basic share |  |  |  | $ 0.02 cpt_Incomelossonsaleoflandperbasicshare |  | $ 0.02 cpt_Incomelossonsaleoflandperbasicshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income loss on disposition of land per diluted share |  |  |  | $ 0.02 cpt_Incomelossondispositionoflandperdilutedshare |  | $ 0.02 cpt_Incomelossondispositionoflandperdilutedshare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 cpt_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.

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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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