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Property Acquisitions, Discontinued Operations, And Assets Held For Sale Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Pro Forma Consolidated Income Statement Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract] |  |
Property revenues | $ 181,598 | $ 168,581
Property expenses | 68,759 | 67,070
Property results | $ 112,839 | $ 101,511

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- Definition The pro forma consolidated expenses for the period as if the acquisition of control of joint ventures had occurred at the beginning of the period. + References No definition available. + Details
Name: | cpt_ProFormaConsolidatedExpenses
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents pro forma consolidated property results, which represents property revenues less property expenses, and assumes the acquisition of control of joint ventures had occurred at the beginning of the periods disclosed. + References No definition available. + Details
Name: | cpt_ProFormaConsolidatedPropertyResults
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The pro forma consolidated revenues for the period as if the acquisition of control of joint ventures had occurred at the beginning of the period. + References No definition available. + Details
Name: | cpt_ProFormaConsolidatedRevenues
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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