Revenue, comprised of based and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations excluding third party construction fees.

Name:	cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVenturesExcludingOfThirdPartyConstructionFees
Namespace Prefix:	cpt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of apartment units in Property acquired

+ Details

Name:	cpt_NumberOfApartmentUnitsInPropertyAcquired
Namespace Prefix:	cpt
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of joint ventures accounted for under equity method investments.

+ Details

Name:	cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments
Namespace Prefix:	cpt
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

+ Details

Name:	us-gaap_EquityMethodInvestmentNetSalesProceeds
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a (1)

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the amount of gain or loss arising from the disposal of an equity method investment.

+ Details

Name:	us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

+ Details

Name:	us-gaap_GainLossOnSaleOfProperties
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph c

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Investments in Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2011	Mar. 31, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Number of joint ventures accounted for under equity method investments			17		17
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures			$ 0		$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures			2,471,000	2,045,000	4,309,000	3,883,000
Proceeds from sale of ownership interests in three unconsolidated joint venture communities		19,300,000
Gain on sale of unconsolidated joint venture interests		1,100,000			1,136,000
Proceeds from sale of property	9,400,000
Gain on sale of properties	4,700,000
Houston Texas [Member]
Number of units in multifamily property			1,358		1,358
Atlanta Georgia [Member]
Number of units in multifamily property			234		234
Tampa Florida [Member]
Number of units in multifamily property			450		450
Austin Texas [Member]
Number of units in multifamily property			768		768
San Antonio Texas [Member]
Number of units in multifamily property			288		288
Dallas Texas [Member]
Number of units in multifamily property			1,250		1,250
Minimum [Member]
Equity method investment ownership percentage			15.00%		15.00%
Maximum [Member]
Equity method investment ownership percentage			50.00%		50.00%
Unconsolidated Joint Venture 1 [Member]
Fees earned for property and asset management, construction, development, and other services to joint ventures			$ 2,400,000	$ 1,600,000	$ 3,900,000	$ 3,100,000