XML 20 R37.htm IDEA: XBRL DOCUMENT v2.4.1.9
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   2cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments 2cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments 2cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures   $ 0us-gaap_GuaranteeObligationsMaximumExposure    
Fees earned for property and asset management, construction, development, and other services to joint ventures   1,400,000cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures   2,700,000cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures
Maximum Investments by Acquired Unconsolidated Joint Venture   450,000,000cpt_MaximumInvestmentsbyAcquiredUnconsolidatedJointVenture    
Maximum Leverage to be Utilized by the Unconsolidated Joint Venture   70.00%cpt_Maximumleveragetobeutilizedbytheunconsolidatedjointventure    
Number of Properties Owned by Acquired Unconsolidated Joint Venture   0cpt_NumberofPropertiesOwnedbyAcquiredUnconsolidatedJointVenture    
Number of apartment homes in joint venture's operating properties sold 558cpt_NumberofApartmentUnitsinJointVenturePropertyDisposed      
Proceeds from sale of 2 operating properties 65,600,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment      
Gain on sale of unconsolidated JV property $ 3,600,000cpt_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