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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Expected Useful Lives of Depreciable Property) (Details) | 6 Months Ended
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Jun. 30, 2011
Intangible assets (in-place leases and above and below market leases) | underlying lease term
Building and Improvements [Member] |
Minimum Estimated Useful Life (in Years) | 5
Maximum Estimated Useful Life (in Years) | 35
Furniture, Fixtures, Equipment, and Other [Member] |
Minimum Estimated Useful Life (in Years) | 3
Maximum Estimated Useful Life (in Years) | 20

X
- Definition Expected useful lives of intangible assets related to in-place leases and above and below market leases. + Details
Name: | cpt_ExpectedUsefulLivesOfIntangibleAssetsRelatedToInPlaceLeasesAndAboveAndBelowMarketLeases
Namespace Prefix: | cpt
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum
Namespace Prefix: | us-gaap
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeMinimum
Namespace Prefix: | us-gaap
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration