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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Number of fully consolidated joint ventures acquired |  |  |  |  |  |  | 13 cpt_NumberOfFullyConsolidatedJointVenturesAcquired
Number of joint ventures accounted for under equity method investments |  |  |  |  | 2 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments | 2 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments | 4 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments
Equity method investment ownership percentage |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 31.30%us-gaap_EquityMethodInvestmentOwnershipPercentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures |  |  |  |  | $ 0 us-gaap_GuaranteeObligationsMaximumExposure |  |
Fees earned for property and asset management, construction, development, and other services to joint ventures |  |  |  |  | 8,800,000 cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures | 10,000,000 cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures | 11,400,000 cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures
Number of operating properties sold |  |  |  |  | 5 cpt_NumberOfOperatingPropertiesSold | 12 cpt_NumberOfOperatingPropertiesSold | 11 cpt_NumberOfOperatingPropertiesSold
Number of apartment homes in operating properties sold |  |  |  |  | 1,847 cpt_NumberOfApartmentUnitsInPropertyDisposed | 3,931 cpt_NumberOfApartmentUnitsInPropertyDisposed | 3,213 cpt_NumberOfApartmentUnitsInPropertyDisposed
Sales price of property sold by unconsolidated joint venture | 65,600,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |  |  |  |
Gain on sale of property by unconsolidated joint venture | $ 3,600,000 cpt_GainLossOnSaleOfUnconsolidatedJvProperty | $ 3,566,000 cpt_GainLossOnSaleOfUnconsolidatedJvProperty | $ 3,245,000 cpt_GainLossOnSaleOfUnconsolidatedJvProperty | $ 13,032,000 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  |  |
Sale of two operating properties within the funds in 2014 [Member] |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  | 7 cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof7operatingpropertieswithintwounconsolidatedjointventuresin2012Member
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 |  |  |
Number of apartment homes in operating properties sold | 558 cpt_NumberOfApartmentUnitsInPropertyDisposed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof14operatingpropertieswithinanunconsolidatedjointventureinMay2013Member |  |  |  |  |  |

X
- Definition Revenue earned by providing property management, construction, development, and other services to joint ventures. + References No definition available. + Details
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X
- Definition Our proportionate share of the gain (loss) on the sale of an unconsolidated joint venture property or properties during the period. Gain (loss) is included in equity in income (loss) on the income statement. + References No definition available. + Details
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- Definition Number of apartment units in property disposed of or held for sale during the period. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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