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Summary Of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Average amortization period for below market leases and in-place leases	7 months	6 months	6 months
Capitalized interest	$ 21.8us-gaap_InterestCostsCapitalized	$ 15.4us-gaap_InterestCostsCapitalized	$ 12.5us-gaap_InterestCostsCapitalized
Capitalized real estate taxes	4.4cpt_CapitalizedRealEstateTaxes	3.0cpt_CapitalizedRealEstateTaxes	2.8cpt_CapitalizedRealEstateTaxes
Leasehold Improvements, Gross				$ 12.2us-gaap_LeaseholdImprovementsGross
Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes	99.00%cpt_PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	98.00%cpt_PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	98.00%cpt_PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes

X

- Definition

The amount of real estate or property taxes that were capitalized during the period.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of our total property revenues and total non-property income from leasing of apartment homes, excluding income on deferred compensation plans.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Amount of interest capitalized during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

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