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Acquisitions, Dispositions, Impairment, Assets Held for Sale, and Discontinued Operations (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
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Jul. 31, 2014 acre | Apr. 30, 2014 acre | Jan. 31, 2014 acre | Jun. 30, 2013 acre | Dec. 31, 2014 acre | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2014 acre | Dec. 31, 2013 acre | Dec. 31, 2012 | Jan. 31, 2015
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual, included in Discontinued Operations |  |  |  |  |  |  |  |  |  | $ 6,400,000 cpt_BusinessCombinationProFormaInformationRevenueofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations |
Number of apartment units in wholly owned property acquired |  |  |  |  |  |  |  |  | 1,118 cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired |  |
Business Combination Pro Forma Information Expenses of Acquiree since Acquisition Date, Actual included in Discontinued Operations |  |  |  |  |  |  |  |  |  | 3,100,000 cpt_BusinessCombinationProFormaInformationExpensesofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations |
Pro Forma Property Revenues of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  | 800,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 10,800,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 52,800,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |
Number of operating properties acquired |  |  |  |  |  |  |  | 1 cpt_NumberOfOperatingPropertiesAcquired | 3 cpt_NumberOfOperatingPropertiesAcquired | 7 cpt_NumberOfOperatingPropertiesAcquired |
Acres of land acquired |  | 7.6 cpt_AcresOfLandAcquired | 2.9 cpt_AcresOfLandAcquired | 38.8 cpt_AcresOfLandAcquired |  |  |  |  |  |  |
Purchase price of land acquired |  | 23,800,000 us-gaap_PaymentsToAcquireLand | 15,600,000 us-gaap_PaymentsToAcquireLand | 25,800,000 us-gaap_PaymentsToAcquireLand |  |  |  |  |  |  |
Purchase price of operating properties acquired |  |  |  |  |  |  |  |  | 225,000,000 cpt_SalesPriceOfPropertyPurchased |  |
Pro Forma Property Expenses of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  | 300,000 cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual | 4,500,000 cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual | 21,000,000 cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual |
Number of fully consolidated joint ventures acquired |  |  |  |  |  |  |  |  |  | 13 cpt_NumberOfFullyConsolidatedJointVenturesAcquired |
Impairment associated with land holdings |  |  |  |  |  |  | 1,152,000 us-gaap_ImpairmentOfRealEstate | 1,152,000 us-gaap_ImpairmentOfRealEstate | 0 us-gaap_ImpairmentOfRealEstate | 0 us-gaap_ImpairmentOfRealEstate |
Gain (Loss) on Sale of Properties |  |  |  |  | 155,680,000 us-gaap_GainLossOnSaleOfProperties |  |  | 155,700,000 us-gaap_GainLossOnSaleOfProperties |  |  |
Proceeds from Sale of Land Held-for-investment | 800,000 us-gaap_ProceedsFromSaleOfLandHeldforinvestment |  |  |  |  |  |  | 22,900,000 us-gaap_ProceedsFromSaleOfLandHeldforinvestment |  |  |
Area of Land | 2.4 us-gaap_AreaOfLand |  |  |  | 26.9 us-gaap_AreaOfLand |  |  | 26.9 us-gaap_AreaOfLand | 3.7 us-gaap_AreaOfLand |  |
Gain (loss) on disposition of land |  |  |  |  |  | 1,808,000 cpt_Gainlossondispositionofland | 1,447,000 cpt_Gainlossondispositionofland | 3,600,000 cpt_Gainlossondispositionofland | 700,000 cpt_Gainlossondispositionofland |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  | 5 cpt_NumberOfOperatingPropertiesSold | 12 cpt_NumberOfOperatingPropertiesSold | 11 cpt_NumberOfOperatingPropertiesSold |
Number of apartment homes in operating properties sold |  |  |  |  |  |  |  | 1,847 cpt_NumberOfApartmentUnitsInPropertyDisposed | 3,931 cpt_NumberOfApartmentUnitsInPropertyDisposed | 3,213 cpt_NumberOfApartmentUnitsInPropertyDisposed |
Proceeds from Sale of Property Held-for-sale |  |  |  |  |  |  |  | 218,300,000 cpt_Proceedsfromsaleofoperatingproperties |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  |  |  |  | 2 cpt_NumberOfOperatingPropertiesSold / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of apartment homes in operating properties sold |  |  |  |  |  |  |  |  |  |  | 1,116 cpt_NumberOfApartmentUnitsInPropertyDisposed / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from Sale of Property Held-for-sale |  |  |  |  |  |  |  |  |  |  | $ 114,400,000 cpt_Proceedsfromsaleofoperatingproperties / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Acres of land acquired by the company during the period to be utilized in the development of multiple multifamily apartment communities. + References No definition available. + Details
Name: | cpt_AcresOfLandAcquired
Namespace Prefix: | cpt_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of expenses of the acquiree since the acquisition date which were subsequently sold and now is included in discontinued operations for the reporting period. + References No definition available. + Details
Name: | cpt_BusinessCombinationProFormaInformationExpensesofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of property expenses of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
Name: | cpt_BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquirees since the acquisition date which were subsequently sold and now is included in discontinued operations for the reporting period. + References No definition available. + Details
Name: | cpt_BusinessCombinationProFormaInformationRevenueofAcquireesinceAcquisitionDateActualincludedinDiscontinuedOperations
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (loss) on disposition of land - excludes operating properties, relates to land holdings + References No definition available. + Details
Name: | cpt_Gainlossondispositionofland
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of apartment units in property disposed of or held for sale during the period. + References No definition available. + Details
Name: | cpt_NumberOfApartmentUnitsInPropertyDisposed
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of apartment units associated with the property or properties acquired during the period. + References No definition available. + Details
Name: | cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of fully consolidated joint ventures acquired during the period. + References No definition available. + Details
Name: | cpt_NumberOfFullyConsolidatedJointVenturesAcquired
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating properties acquired which are now fully consolidated during the period. + References No definition available. + Details
Name: | cpt_NumberOfOperatingPropertiesAcquired
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating properties sold during the period. + References No definition available. + Details
Name: | cpt_NumberOfOperatingPropertiesSold
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from sale of operating properties - this is sale of operating properties not classified as discontinued operations. This includes only operating properties, this does not include any land held for sale. + References No definition available. + Details
Name: | cpt_Proceedsfromsaleofoperatingproperties
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cpt_PropertyAcquisitionsDiscontinuedOperationsAndAssetsHeldForSaleAbstract
Namespace Prefix: | cpt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sales price of property or properties purchased during the period. + References No definition available. + Details
Name: | cpt_SalesPriceOfPropertyPurchased
Namespace Prefix: | cpt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
Name: | us-gaap_ImpairmentOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireLand
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfLandHeldforinvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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