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

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- Details
Name: | cpt_DescriptionofbusinessAbstract
Namespace Prefix: | cpt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total number of real estate properties the company owned interests in, operated, or were developing as of the balance sheet date. + References No definition available. + Details
Name: | cpt_NumberOfMultifamilyCommunities
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties under development the company owned interests in or fully owned as of the balance sheet date. + References No definition available. + Details
Name: | cpt_NumberOfMultifamilyPropertiesUnderDevelopment
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of units in real estate properties the company owned interests in, operated, or were developing as of the balance sheet date. + References No definition available. + Details
Name: | cpt_TotalNumberOfApartmentHomesInMultifamilyCommunities
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | cpt_TotalNumberOfApartmentHomesInMultifamilyPropertiesUponCompletionOfDevelopment
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant