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Common Shares (Tables) | 6 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2011 2010 ATM Program [Member] | Jun. 30, 2011 2011 ATM Program [Member]
Activity Under ATM Share Offering Program |
|  | Three Months Ended June 30, 2011 |  |  | Six Months Ended June 30, 2011 |
Common shares sold |  |  | 0.2 |  |  |  | 0.3 |
Total net consideration |  | $ | 10.0 |  |  | $ | 13.8 |
Average price per share |  | $ | 56.50 |  |  | $ | 55.81 |
|  | Three Months Ended June 30, 2011 |
Common shares sold |  |  | 0.4 |
Total net consideration |  | $ | 23.3 |
Average price per share |  | $ | 64.52 |

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- Definition Activity Under ATM Share Offering Program. + Details
Name: | cpt_ActivityUnderAtmShareOfferingProgramTextBlock
Namespace Prefix: | cpt
Data Type: | us-types:textBlockItemType
Balance Type: | na
Period Type: | duration