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Income Taxes (Reconciliation of Net Income to REIT Taxable Income) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax reconciliation, Estimated designated dividends included in Dividends Paid Deduction |  |  |  |  |  |  |  |  | $ 84,000,000 cpt_IncometaxreconciliationEstimateddesignateddividendsincludedinDividendsPaidDeduction |  |  |  |  |
Net income attributable to common shareholders | 178,498,000 us-gaap_NetIncomeLoss | 38,283,000 us-gaap_NetIncomeLoss | 35,272,000 us-gaap_NetIncomeLoss | 40,036,000 us-gaap_NetIncomeLoss | 129,996,000 us-gaap_NetIncomeLoss | 70,720,000 us-gaap_NetIncomeLoss | 72,172,000 us-gaap_NetIncomeLoss | 63,476,000 us-gaap_NetIncomeLoss | 292,089,000 us-gaap_NetIncomeLoss | [1] | 336,364,000 us-gaap_NetIncomeLoss | [1] | 283,390,000 us-gaap_NetIncomeLoss |
(Income) loss from taxable Real Estate Investment Trust subsidiaries included above |  |  |  |  |  |  |  |  | (1,523,000)cpt_LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders |  | (2,940,000)cpt_LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders |  | 3,323,000 cpt_LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders |
Net income from Real Estate Investment Trust operations |  |  |  |  |  |  |  |  | 290,566,000 cpt_NetIncomeLossFromRealEstateInvestmentTrustOperations |  | 333,424,000 cpt_NetIncomeLossFromRealEstateInvestmentTrustOperations |  | 286,713,000 cpt_NetIncomeLossFromRealEstateInvestmentTrustOperations |
Book depreciation and amortization, including discontinued operations |  |  |  |  |  |  |  |  | 238,989,000 cpt_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations |  | 223,198,000 cpt_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations |  | 213,479,000 cpt_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations |
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (200,153,000)cpt_IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization |  | (204,059,000)cpt_IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization |  | (171,060,000)cpt_IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization |
Book/tax difference on gains/losses from capital transactions |  |  |  |  |  |  |  |  | (35,635,000)cpt_IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions |  | (86,358,000)cpt_IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions |  | (63,832,000)cpt_IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions |
Other book/tax differences, net |  |  |  |  |  |  |  |  | 8,805,000 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | (9,427,000)us-gaap_IncomeTaxReconciliationOtherAdjustments |  | (40,961,000)us-gaap_IncomeTaxReconciliationOtherAdjustments |
Real Estate Investment Trust Taxable Income |  |  |  |  |  |  |  |  | 302,572,000 cpt_RealEstateInvestmentTrustTaxableIncome |  | 256,778,000 cpt_RealEstateInvestmentTrustTaxableIncome |  | 224,339,000 cpt_RealEstateInvestmentTrustTaxableIncome |
Dividends paid deduction |  |  |  |  |  |  |  |  | (302,572,000)us-gaap_IncomeTaxReconciliationDeductionsDividends | [2] | (256,778,000)us-gaap_IncomeTaxReconciliationDeductionsDividends | [3] | (224,339,000)us-gaap_IncomeTaxReconciliationDeductionsDividends | [4]
Dividends Paid In Excess Of Taxable Income |  |  |  |  |  |  |  |  | 0 cpt_DividendsPaidInExcessOfTaxableIncome |  | 0 cpt_DividendsPaidInExcessOfTaxableIncome |  | 0 cpt_DividendsPaidInExcessOfTaxableIncome |
Income tax reconciliation, designated dividends included in dividends paid deduction |  |  |  |  |  |  |  |  |  |  | $ 5,100,000 cpt_IncomeTaxReconciliationDesignatedDividendsIncludedInDividendsPaidDeduction |  | $ 26,600,000 cpt_IncomeTaxReconciliationDesignatedDividendsIncludedInDividendsPaidDeduction |
[1] | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income per share amounts may not equal the total computed for the year.
[2] | The dividends paid deduction includes estimated designated dividends from 2015 of approximately $84.0 million.
[3] | We borrowed approximately $5.1 million from 2014 for designated dividends in 2013.
[4] | We borrowed approximately $26.6 million from 2013 for designated dividends in 2012.

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- Definition The current period expense charged against earnings on long-lived, physical assets from continuing operations and also including depreciation and amortization from discontinued operations. Additionally, we include the component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate. These amounts are nondeductible for tax purposes. + References No definition available. + Details
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- Definition Amount of loss associated with the taxable REIT subsidiaries included in net income (loss) attributable to common shareholders. This amount is deducted for tax purposes. + References No definition available. + Details
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