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Common Shares (Tables) | 9 Months Ended
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Sep. 30, 2011
2010 ATM Program [Member] |
Activity Under At-The-Market Share Offering Program |
|  | Three Months Ended September 30, 2011 |  |  | Nine Months Ended September 30, 2011 |
Total net consideration |  | $ | — |  |  | $ | 13,847.0 |
Common shares sold |  |  | — |  |  |  | 252.5 |
Average price per share |  | $ | — |  |  | $ | 55.81 |
2011 ATM Program [Member] |
Activity Under At-The-Market Share Offering Program |
|  | Three Months Ended September 30, 2011 |  |  | Nine Months Ended September 30, 2011 |
Total net consideration |  | $ | 32,736.8 |  |  | $ | 56,015.9 |
Common shares sold |  |  | 506.2 |  |  |  | 875.4 |
Average price per share |  | $ | 65.76 |  |  | $ | 65.24 |

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