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Description Of Business (Details)
Mar. 31, 2015
Description of business [Abstract]  
Number of multifamily communities comprising of apartment homes 180cpt_NumberOfMultifamilyCommunities
Total number of apartment homes in multifamily communities 62,452cpt_TotalNumberOfApartmentHomesInMultifamilyCommunities
Number of multifamily properties under development 12cpt_NumberOfMultifamilyPropertiesUnderDevelopment
Total Number of Apartment Homes in Multifamily Properties Upon Completion Of Development 4,006cpt_TotalNumberOfApartmentHomesInMultifamilyPropertiesUponCompletionOfDevelopment