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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 | $ 21.8 us-gaap_InterestCostsCapitalized | $ 15.4 us-gaap_InterestCostsCapitalized | $ 12.5 us-gaap_InterestCostsCapitalized |
Capitalized real estate taxes | 4.4 cpt_CapitalizedRealEstateTaxes | 3.0 cpt_CapitalizedRealEstateTaxes | 2.8 cpt_CapitalizedRealEstateTaxes |
Leasehold Improvements, Gross |  |  |  | $ 12.2 us-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 |

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- 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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- 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 + Details
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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 + Details
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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 + Details
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