Description Of Business (Details)	Sep. 30, 2014
Accounting Policies [Abstract]
Total Number of Apartment Homes in Multifamily Properties Upon Completion Of Development	4,114
Number of multifamily communities comprising of apartment homes	183
Total number of apartment homes in multifamily communities	64,152
Number of multifamily properties under development	13

The number of units in the real estate properties under development the company owned interests in or fully owned as of the balance sheet date which will be added upon completion of development.

No definition available.

Name:	cpt_TotalNumberOfApartmentHomesInMultifamilyPropertiesUponCompletionOfDevelopment
Namespace Prefix:	cpt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant