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Dispositions and Assets Held for Sale (Narrative) (Details) | 3 Months Ended
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Dec. 31, 2010
Dispositions and Assets Held for Sale |
Number of operating properties sold | 2
Number of apartment homes in operating properties sold | 1,066

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of apartment homes in operating property Sold + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of Operating properties sold + Details
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Namespace Prefix: | cpt
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Period Type: | duration