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v2.4.1.9

Common Shares (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | May 01, 2015 | Dec. 31, 2014
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 |  | 86,800,000 us-gaap_CommonStockSharesOutstanding |  |  |
Preferred Stock, Shares Outstanding |  | 0 us-gaap_PreferredStockSharesOutstanding |  |  |
2014 ATM program [Member] |  |  |  |  |
Maximum aggregate offering price of common shares | $ 331.3 cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_A2014ATMprogramMember |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 0.0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_A2014ATMprogramMember | 0.0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_A2014ATMprogramMember |  |
Subsequent Event [Member] | 2014 ATM program [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / cpt_ShareOfferingProgramAxis = cpt_A2014ATMprogramMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  | 315.3 cpt_MaximumAggregateOfferingPriceOfRemainingCommonSharesAvailableForSale / cpt_ShareOfferingProgramAxis = cpt_A2014ATMprogramMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Line of Credit [Member] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 500 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |

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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 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 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 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 4: 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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