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Acquisitions and Dispositions (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Jan. 31, 2015 | Mar. 31, 2014 acre | Jan. 31, 2014 acre | Mar. 31, 2015 | Mar. 31, 2014 acre | Apr. 30, 2015 acre
Area of Land |  |  | 3.0 us-gaap_AreaOfLand | 2.9 us-gaap_AreaOfLand |  | 3.0 us-gaap_AreaOfLand |
Payments to Acquire Land |  |  |  | $ 15,600,000 us-gaap_PaymentsToAcquireLand |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 0.01%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  |  |  | 0.01%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  |
Number of fully consolidated joint ventures acquired |  |  |  |  | 2 cpt_NumberOfFullyConsolidatedJointVenturesAcquired |  |
Number of apartment units in wholly owned property acquired |  |  |  |  | 798 cpt_NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired |  |
Purchase of non-controlling interests |  |  |  |  | 9,500,000 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination | 0 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination |
Sales price of land parcels | 400,000 us-gaap_ProceedsFromSaleOfLandHeldforinvestment |  | 6,300,000 us-gaap_ProceedsFromSaleOfLandHeldforinvestment |  |  |  |
Gain (loss) on disposition of land | 100,000 cpt_Gainlossondispositionofland |  | 400,000 cpt_Gainlossondispositionofland |  |  |  |
Number of operating properties sold |  | 2 cpt_NumberOfOperatingPropertiesSold |  |  |  |  |
Number of Apartment Units in operating Property Disposed |  | 1,116 cpt_NumberOfApartmentUnitsInPropertyDisposed |  |  |  |  |
Proceeds from sale of operating properties |  | 114,400,000 cpt_Proceedsfromsaleofoperatingproperties |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  | 85,100,000 us-gaap_GainLossOnSaleOfProperties |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Area of Land |  |  |  |  |  |  | 50.0 us-gaap_AreaOfLand / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Payments to Acquire Land |  |  |  |  |  |  | $ 36,300,000 us-gaap_PaymentsToAcquireLand / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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 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
- 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 Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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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=56944662&loc=d3e3602-108585 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Increase in noncontrolling interest balance because of a business combination that occurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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=56944662&loc=d3e3213-108585 + Details
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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=56944662&loc=d3e3179-108585 + Details
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