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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 acre | Apr. 30, 2015 acre | Jan. 31, 2014 acre
Number of consolidated projects under construction | 11 cpt_Numberofconsolidatedprojectsunderconstruction |  |  |
Anticipated expenditures relating to completion of construction type contracts | $ 394.0 cpt_AnticipatedExpendituresRelatingToCompletionOfConstructionTypeContracts |  |  |
Earnest Money Deposits | 1.3 us-gaap_EarnestMoneyDeposits |  |  |
Area of Land |  | 3.0 us-gaap_AreaOfLand |  | 2.9 us-gaap_AreaOfLand
Rental expense | 0.8 us-gaap_LeaseAndRentalExpense | 0.7 us-gaap_LeaseAndRentalExpense |  |
Minimum annual rental commitments, remainder of 2015 | 1.6 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |
Minimum annual rental commitments, 2016 | 2.7 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |
Minimum annual rental commitments, 2017 | 2.7 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |
Minimum annual rental commitments, 2018 | 2.5 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |
Minimum annual rental commitments, 2019 | 2.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |
Minimum annual rental commitments, thereafter | 13.1 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |  |
Maximum [Member] | Partnership Interest [Member] |  |  |  |
Less than joint venture economic interest noted | 100.00%cpt_EconomicInterestInJointVentures / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Non-Refundable [Member] |  |  |  |
Earnest Money Deposits | 1.0 us-gaap_EarnestMoneyDeposits / cpt_RefundabilityOfDepositAxis = cpt_NonRefundableMember |  |  |
Subsequent Event [Member] |  |  |  |
Area of Land |  |  | 50.0 us-gaap_AreaOfLand / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Payments to Acquire Land |  |  | $ 11.9 cpt_Downpaymentonacquiringland / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

X
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- Definition Down payment on acquiring land - not the full sales value, but the non-refundable down payment + References No definition available. + Details
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- Definition Economic interest in the community or land owned directly by the joint venture or partnership is less than this amount in order to qualify as a joint venture or partnership. + References No definition available. + Details
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- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
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