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Investments In Joint Ventures (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Number of joint ventures accounted for under equity method investments	4
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures	$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures	$ 2,700,000	$ 2,700,000
Number of assets under contract to be sold in an unconsolidated joint venture	14
Number of apartment homes under contract to be sold in an unconsolidated joint venture	3,098
Minimum [Member]
Equity method investment ownership percentage	15.00%
Maximum [Member]
Equity method investment ownership percentage	20.00%

X

- Definition

Revenue earned by providing property management, construction, development, and other services to joint ventures.

+ References

No definition available.

+ Details

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

X

- Definition

Number of apartment homes in assets under contract to be sold included in one of our unconsolidated joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	cpt_
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Balance Type:	na
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X

- Definition

Number of assets under contract to be sold in an unconsolidated joint venture subsequent to quarter end.

+ References

No definition available.

+ Details

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Namespace Prefix:	cpt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of joint ventures accounted for under equity method investments.

+ References

No definition available.

+ Details

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Namespace Prefix:	cpt_
Data Type:	xbrli:integerItemType
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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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