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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Total net consideration | $ 66,225,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 40,044,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 693,355,000 us-gaap_StockIssuedDuringPeriodValueNewIssues
Common shares sold | 898 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 555 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 11,192 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Two thousand fourteen ATM program [Domain] |  |  |
Total net consideration | 15,690,200 us-gaap_StockIssuedDuringPeriodValueNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain |  |
Common shares sold | 209,700 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain |  |
Average price per common share sold | $ 76.28 cpt_AveragePricePerCommonShareSold / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain |  |
2012 ATM Program [Member] |  |  |
Total net consideration | 50,535,300 us-gaap_StockIssuedDuringPeriodValueNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember | 40,044,100 us-gaap_StockIssuedDuringPeriodValueNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember |
Common shares sold | 688,300 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember | 555,100 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember |
Average price per common share sold | $ 74.60 cpt_AveragePricePerCommonShareSold / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember | $ 73.73 cpt_AveragePricePerCommonShareSold / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember |
2012 and 2011 Atm Programs [Domain] |  |  |
Total net consideration |  |  | $ 301,735,500 us-gaap_StockIssuedDuringPeriodValueNewIssues / cpt_ShareOfferingProgramAxis = cpt_A2012and2011AtmProgramsDomain
Common shares sold |  |  | 4,579,300 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_A2012and2011AtmProgramsDomain
Average price per common share sold |  |  | $ 66.93 cpt_AveragePricePerCommonShareSold / cpt_ShareOfferingProgramAxis = cpt_A2012and2011AtmProgramsDomain

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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