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Income Taxes - Schedule of Effective Tax Rates (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Federal provision 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State provision 8.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State benefit (2.90%)ecpg_BenefitForStateTaxes (2.00%)ecpg_BenefitForStateTaxes (2.30%)ecpg_BenefitForStateTaxes
Changes in state apportionment 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Tax reserves 0.00%ecpg_EffectiveIncomeTaxRateReconciliationTaxReserves 0.00%ecpg_EffectiveIncomeTaxRateReconciliationTaxReserves 0.10%ecpg_EffectiveIncomeTaxRateReconciliationTaxReserves
International benefit (3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Permanent items 4.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Other (6.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Effective rate 34.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations