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Notes Payable (Scheduled Repayments On Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
2015	$ 251.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016	2.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	[1]
2017	249.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018	177.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019	646.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter	1,416.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total notes payable	$ 2,743.5us-gaap_LongTermDebt
Weighted Average Interest Rate	4.40%us-gaap_DebtWeightedAverageInterestRate
Maturities Due In 2015 [Member]
Weighted Average Interest Rate	5.10%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueIn2015Member
Maturities Due In 2016 [Member]
Weighted Average Interest Rate	0.00%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueIn2016Member	[1]
Maturities Due In 2017 [Member]
Weighted Average Interest Rate	5.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueIn2017Member
Maturities Due In 2018 [Member]
Weighted Average Interest Rate	0.90%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueIn2018Member
Maturities Due In 2019 [Member] [Domain]
Weighted Average Interest Rate	5.30%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueIn2019MemberDomain
Maturities Due Thereafter [Member]
Weighted Average Interest Rate	4.00%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = cpt_MaturitiesDueThereafterMember
[1] Includes only scheduled principal amortizations.

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Weighted average interest rate of debt outstanding.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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