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Derivatives and Hedging Instruments - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Forward Contracts [Member]
USD ($)
Mar. 31, 2014
Forward Contracts [Member]
USD ($)
Mar. 31, 2015
Cabot Acquisition [Member]
GBP (£)
contract
Derivative [Line Items]      
Number of interest rate cap contracts held     1us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= ecpg_CabotAcquisitionMember
Derivative instrument, notional amount $ 45,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
  £ 100,000,000invest_DerivativeNotionalAmount
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= ecpg_CabotAcquisitionMember
Net derivative gain included in OCI will be reclassified into earnings 200,000us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
   
Gains or losses were reclassified from OCI into earnings $ 0us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
$ 0us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember