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Common Shares (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2014 | May 31, 2011 | May 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 20, 2015
Number of common and preferred stock authorized to issue |  |  |  | 185,000,000 cpt_SharesAuthorized |  |
Common shares, authorized |  |  |  | 175,000,000 us-gaap_CommonStockSharesAuthorized | 175,000,000 us-gaap_CommonStockSharesAuthorized |
Preferred shares, authorized |  |  |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Common Stock, Shares, Outstanding |  |  |  | 86,600,000 us-gaap_CommonStockSharesOutstanding |  |
Two thousand fourteen ATM program [Domain] |  |  |  |  |  |
Maximum aggregate offering price of common shares | $ 331.3 cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain |  |  |  |  |
2010 and 2011 ATM Programs [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares |  | 300.0 cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_A2010And2011AtmProgramsMember |  |  |  |
2012 ATM Program [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares |  |  | 300.0 cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember |  |  |
Line of Credit [Member] |  |  |  |  |  |
Amount of current borrowing capacity under unsecured credit facility |  |  |  | 500 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Subsequent Event [Member] | Two thousand fourteen ATM program [Domain] |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  | $ 315.3 cpt_MaximumAggregateOfferingPriceOfRemainingCommonSharesAvailableForSale / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Maximum aggregate offering price of common shares under the at-the-market share offering program available for sale. + References No definition available. + Details
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- Definition The maximum number of common shares and nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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