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Investments In Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended			12 Months Ended
	Feb. 28, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of fully consolidated joint ventures acquired							13cpt_NumberOfFullyConsolidatedJointVenturesAcquired
Number of joint ventures accounted for under equity method investments					2cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	2cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	4cpt_NumberOfJointVenturesAccountedForUnderEquityMethodInvestments
Equity method investment ownership percentage			20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage		31.30%us-gaap_EquityMethodInvestmentOwnershipPercentage	20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures					$ 0us-gaap_GuaranteeObligationsMaximumExposure
Fees earned for property and asset management, construction, development, and other services to joint ventures					8,800,000cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	10,000,000cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	11,400,000cpt_FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures
Number of operating properties sold					5cpt_NumberOfOperatingPropertiesSold	12cpt_NumberOfOperatingPropertiesSold	11cpt_NumberOfOperatingPropertiesSold
Number of apartment homes in operating properties sold					1,847cpt_NumberOfApartmentUnitsInPropertyDisposed	3,931cpt_NumberOfApartmentUnitsInPropertyDisposed	3,213cpt_NumberOfApartmentUnitsInPropertyDisposed
Sales price of property sold by unconsolidated joint venture	65,600,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Gain on sale of property by unconsolidated joint venture	$ 3,600,000cpt_GainLossOnSaleOfUnconsolidatedJvProperty	$ 3,566,000cpt_GainLossOnSaleOfUnconsolidatedJvProperty	$ 3,245,000cpt_GainLossOnSaleOfUnconsolidatedJvProperty	$ 13,032,000cpt_GainLossOnSaleOfUnconsolidatedJvProperty
Sale of two operating properties within the funds in 2014 [Member]
Number of operating properties sold	2cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleoftwooperatingpropertieswithinthefundsin2014Member
Sale of 16 operating properties within two unconsolidated joint ventures in 2013 [Member]
Number of operating properties sold						16cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof16operatingpropertieswithintwounconsolidatedjointventuresin2013Member
Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member]
Number of operating properties sold							7cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof7operatingpropertieswithintwounconsolidatedjointventuresin2012Member
Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Number of operating properties sold				14cpt_NumberOfOperatingPropertiesSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof14operatingpropertieswithinanunconsolidatedjointventureinMay2013Member
Number of apartment homes in operating properties sold	558cpt_NumberOfApartmentUnitsInPropertyDisposed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cpt_Saleof14operatingpropertieswithinanunconsolidatedjointventureinMay2013Member

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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- Definition

Our proportionate share of the gain (loss) on the sale of an unconsolidated joint venture property or properties during the period. Gain (loss) is included in equity in income (loss) on the income statement.

+ References

No definition available.

+ Details

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- Definition

Number of apartment units in property disposed of or held for sale during the period.

+ References

No definition available.

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- Definition

Number of fully consolidated joint ventures acquired during the period.

+ References

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- Definition

Number of joint ventures accounted for under equity method investments.

+ References

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Number of operating properties sold during the period.

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- 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 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

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- 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 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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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 Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 12

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