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Fair Value Disclosures (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Deferred compensation plan investments	$ 37.8	[1]	$ 35.0
Participant Withdrawals From Deferred Compensation Plan Investments	0.9
Level 1 [Member]
Deferred compensation plan investments	37.8	[1]	35.0
Level 2 [Member]
Deferred compensation plan investments	0	[1]	0
Level 3 [Member]
Deferred compensation plan investments	$ 0	[1]	$ 0
[1] Approximately $0.9 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2013.

X

- Definition

Participant withdrawals from deferred compensation plan investments

+ References

No definition available.

+ Details

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Namespace Prefix:	cpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ 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 210.5-02.17)

-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 17

-Article 5

+ Details

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