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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				185,000,000cpt_SharesAuthorized
Common shares, authorized				175,000,000us-gaap_CommonStockSharesAuthorized	175,000,000us-gaap_CommonStockSharesAuthorized
Preferred shares, authorized				10,000,000us-gaap_PreferredStockSharesAuthorized
Common Stock, Shares, Outstanding				86,600,000us-gaap_CommonStockSharesOutstanding
Two thousand fourteen ATM program [Domain]
Maximum aggregate offering price of common shares	$ 331.3cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_TwothousandfourteenATMprogramDomain
2010 and 2011 ATM Programs [Member]
Maximum aggregate offering price of common shares		300.0cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_A2010And2011AtmProgramsMember
2012 ATM Program [Member]
Maximum aggregate offering price of common shares			300.0cpt_MaximumAggregateOfferingPriceOfCommonShares / cpt_ShareOfferingProgramAxis = cpt_TwoThousandTwelveAtmProgramMember
Line of Credit [Member]
Amount of current borrowing capacity under unsecured credit facility				500us-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						$ 315.3cpt_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.

+ References

No definition available.

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Maximum aggregate offering price of common shares under the at-the-market share offering program available for sale.

+ References

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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.

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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)

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-Number 210

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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

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The maximum number of 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.

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