Description Of Business (Details)	Sep. 30, 2012
Accounting Policies [Abstract]
Number of multifamily communities comprising of apartment homes	209
Total number of apartment homes in multifamily communities	70,871
Number of multifamily properties under development	6
Total number of apartment homes in multifamily properties upon completion of development	2,040

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