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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percentage |  | 31.30%us-gaap_EquityMethodInvestmentOwnershipPercentage | 31.30%us-gaap_EquityMethodInvestmentOwnershipPercentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Number of joint ventures accounted for under equity method investments |  | 2 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments | 2 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments | 2 cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments
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 |  | 1,400,000 cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures |  | 2,700,000 cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures
Maximum Investments by Acquired Unconsolidated Joint Venture |  | 450,000,000 cpt_MaximumInvestmentsbyAcquiredUnconsolidatedJointVenture |  |
Maximum Leverage to be Utilized by the Unconsolidated Joint Venture |  | 70.00%cpt_Maximumleveragetobeutilizedbytheunconsolidatedjointventure |  |
Number of Properties Owned by Acquired Unconsolidated Joint Venture |  | 0 cpt_NumberofPropertiesOwnedbyAcquiredUnconsolidatedJointVenture |  |
Number of apartment homes in joint venture's operating properties sold | 558 cpt_NumberofApartmentUnitsinJointVenturePropertyDisposed |  |  |
Proceeds from sale of 2 operating properties | 65,600,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |
Gain on sale of unconsolidated JV property | $ 3,600,000 cpt_GainLossOnSaleOfUnconsolidatedJvProperty |  |  |
Acquired Unconsolidated Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percentage |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |

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- Definition Revenue earned by providing property management, construction, development, and other services to joint ventures. + References No definition available. + Details
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- 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 Maximum investment by acquired unconsolidated joint venture including leverage of approximately 70% of the estimated value of the underlying real estate + References No definition available. + Details
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- Definition Maximum leverage to be utilized by the unconsolidated joint venture + References No definition available. + Details
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- Definition Number of Apartment Units in Joint Venture Property Disposed + References No definition available. + Details
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- Definition Number of joint ventures accounted for under equity method investments. + References No definition available. + Details
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- Definition Number of properties owned by acquired unconsolidated joint venture + 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=56944662&loc=d3e3179-108585 + Details
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