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Common Shares (Tables) | 9 Months Ended
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Sep. 30, 2013 2012 ATM Program [Member] | Sep. 30, 2012 2010 and 2011 ATM Programs [Member]
Activity Under At-The-Market Share Offering Program | The following table presents activity under our 2012 ATM program for the three and nine months ended September 30, 2013 and 2012 (in thousands, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Total net consideration | $ | — |  |  | $ | 88,915.9 |  |  | $ | 40,097.6 |  |  | $ | 173,627.6 |
Common shares sold | — |  |  | 1,302.5 |  |  | 555.1 |  |  | 2,607.9 |
Average price per share | $ | — |  |  | $ | 69.34 |  |  | $ | 73.73 |  |  | $ | 67.63 |
| The following table presents activity under our 2011 ATM program for the three and nine months ended September 30, 2012 (in thousands, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, 2012 |  | September 30, 2012
Total net consideration | $ | — |  |  | $ | 128,128.0 |
Common shares sold | — |  |  | 1,971.4 |
Average price per share | $ | — |  |  | $ | 66.01 |

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- Definition Activity Under ATM Share Offering Program. + References No definition available. + Details
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Namespace Prefix: | cpt_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration