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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  |  |  |  |  | $ 7,800,000 cpt_Revenuespriortosaleofoperatingpropertiesinunconsolidatedjointventures |
Total assets |  | 757,800,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets |  | 790,200,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets |  |  |
Total third party debt |  | 523,600,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities |  | 530,700,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities |  |  |
Total equity |  | 203,300,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital |  | 229,600,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital |  |  |
Total revenues |  | 105,600,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | [1] | 93,900,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | [1] | 91,600,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | [1],[2]
Gain On Sale Of Joint Venture Operating Property Net Of Tax |  | 18,500,000 cpt_GainOnSaleOfJointVentureOperatingPropertyNetOfTax |  | 112,400,000 cpt_GainOnSaleOfJointVentureOperatingPropertyNetOfTax |  | 49,700,000 cpt_GainOnSaleOfJointVentureOperatingPropertyNetOfTax |
Net income (loss) |  | 26,900,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |  | 120,700,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |  | 50,500,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |
Equity in income of joint ventures |  | 7,023,000 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | [3] | 24,865,000 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | [3] | 20,175,000 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | [3]
Number of fully consolidated joint ventures acquired |  |  |  |  |  | 13 cpt_NumberOfFullyConsolidatedJointVenturesAcquired |
Number of operating properties sold |  | 5 cpt_NumberOfOperatingPropertiesSold |  | 12 cpt_NumberOfOperatingPropertiesSold |  | 11 cpt_NumberOfOperatingPropertiesSold |
Sale of two operating properties within the funds in 2014 [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  | 1,100,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleoftwooperatingpropertieswithinthefundsin2014Member |  | 7,400,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleoftwooperatingpropertieswithinthefundsin2014Member |  | 6,800,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleoftwooperatingpropertieswithinthefundsin2014Member |
Number of operating properties sold | 2 cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleoftwooperatingpropertieswithinthefundsin2014Member |  |  |  |  |  |
Sale of 16 operating properties within two unconsolidated joint ventures in 2013 [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  |  |  | 17,900,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof16operatingpropertieswithintwounconsolidatedjointventuresin2013Member |  | 33,500,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof16operatingpropertieswithintwounconsolidatedjointventuresin2013Member |
Number of operating properties sold |  |  |  | 16 cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof16operatingpropertieswithintwounconsolidatedjointventuresin2013Member |  |  |
Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  |  |  |  |  | $ 23,300,000 cpt_RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof7operatingpropertieswithintwounconsolidatedjointventuresin2012Member |
Number of operating properties sold |  |  |  |  |  | 7 cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof7operatingpropertieswithintwounconsolidatedjointventuresin2012Member |
[1] | (1)Excludes approximately $1.1 million, $7.4 million and $6.8 million of revenue for the years ended December 31, 2014, 2013 and 2012, respectively, related to the sale of two operating properties by the funds during the first quarter of 2014. These properties were held for sale within two of our unconsolidated joint ventures at December 31, 2013. Also excludes approximately $17.9 million and $33.5 million, respectively, related to discontinued operations from the sale of 16 operating properties within two of our unconsolidated joint ventures during 2013. Revenues for the year ended December 31, 2012 also excludes approximately $23.3 million related to discontinued operations from the sale of seven operating properties within two of our unconsolidated joint ventures during 2012.
[2] | Includes approximately $7.8 million of revenues for the year ended December 31, 2012 related to 13 previously unconsolidated joint ventures acquired by us during the year ended December 31, 2012.
[3] | Equity in income excludes our ownership interest of fee income from various services provided by us to the funds.

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- Definition Gain On Sale Of Joint Venture Operating Property Net Of Tax - Gains which are not consolidated properties, but were held in a Joint Venture + References No definition available. + Details
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- Definition Number of fully consolidated joint ventures acquired during the period. + References No definition available. + Details
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- Definition Number of operating properties sold during the period. + References No definition available. + Details
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- Definition This element represents the overall revenues from discontinued operations attributable to one or more unconsolidated joint ventures. + References No definition available. + Details
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- Definition This element represents the overall revenues prior to the sale of operating properties in one or more unconsolidated joint ventures. + References No definition available. + Details
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- Definition The amount of assets reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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- Definition Amount of equity, excluding noncontrolling interest, attributable to the equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 + Details
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- Definition The amount of liabilities reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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