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Share-Based Compensation and Benefit Plans Share-Based Compensation and Benefit Plans (Employee Share Purchase Plan Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Document Fiscal Year Focus	2014
Stock Issued During Period, Shares, Employee Stock Purchase Plans	25,728us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	17,171us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	20,137us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan	$ 71.19cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	$ 62.59cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	$ 67.80cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 0.5us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense	$ 0.2us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense	$ 0.3us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense

X

- Definition

Weighted average fair value of shares purchased during the period related to the employee share purchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	cpt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_ShareBasedCompensationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ 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

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