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Debt - Encore Revolving Credit Facility and Term Loan Facility (Detail) (USD $)
 0 Months Ended
Aug. 01, 2014
subtranche
Mar. 31, 2015
Dec. 31, 2014
Aug. 01, 2014
Mar. 31, 2014
Debt Instrument [Line Items]          
Term loan facility   $ 144,063,000us-gaap_OtherLongTermDebt $ 146,023,000us-gaap_OtherLongTermDebt    
Debt instrument, number of subtranches 2ecpg_DebtInstrumentNumberofSubtranches        
Percentage to be added to base rate for alternate base rate (percent) 0.50%ecpg_PercentageToBeAddedToBaseRateForAlternateBaseRate        
Percentage to be added to adjusted base rate for alternate base rate (percent) 1.00%ecpg_PercentageToBeAddedToAdjustedBaseRateForAlternateBaseRate        
Borrowing base as percentage of eligible estimated collection range start (percent) 30.00%ecpg_BorrowingBaseAsPercentageOfEligibleEstimatedCollectionRangeStart        
Borrowing base as percentage of eligible estimated collection range end (percent) 35.00%ecpg_BorrowingVaseAsPercentageOfEligibleEstimatedCollectionRangeEnd        
Percentage of eligible estimated remaining collections (percent) 33.00%ecpg_PercentageOfEligibleEstimatedRemainingCollections        
Eligible estimated remaining collections for consumer receivables (percent) 55.00%ecpg_DebtInstrumentBorrowingBaseAsPercentageOfReceivables        
Percentage of multiplying factor (percent) 95.00%ecpg_PercentageOfMultiplyingFactor        
Allowance of additional unsecured indebtedness 750,000,000ecpg_MaximumAdditionalUnsecuredDebt     750,000,000ecpg_MaximumAdditionalUnsecuredDebt  
Company's repurchases, common stock 50,000,000.0ecpg_StockRepurchaseProgramMaximumAmountOfCommonStock        
Percentage of acquisitions excluded 50.00%ecpg_PercentageOfOutstandingVotingStock        
Acquisition limit 225,000,000.0ecpg_AcquisitionLimit     225,000,000.0ecpg_AcquisitionLimit  
Investments in unrestricted subsidiaries 250,000,000ecpg_InvestmentInUnrestrictedSubsidiary     250,000,000ecpg_InvestmentInUnrestrictedSubsidiary  
Amount outstanding   631,100,000ecpg_OtherLongTermDebtAndLineOfCreditFacilityAmountOutstanding      
Revolving credit facility, interest rate (percent)   2.98%us-gaap_DebtWeightedAverageInterestRate     2.89%us-gaap_DebtWeightedAverageInterestRate
Propel [Member]          
Debt Instrument [Line Items]          
Investments in unrestricted subsidiaries 200,000,000.0ecpg_InvestmentInUnrestrictedSubsidiary
/ us-gaap_InvestmentTypeAxis
= ecpg_PropelMember		     200,000,000.0ecpg_InvestmentInUnrestrictedSubsidiary
/ us-gaap_InvestmentTypeAxis
= ecpg_PropelMember		  
Term Loan [Member]          
Debt Instrument [Line Items]          
Term loan facility 153,800,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanMember		     153,800,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanMember		  
Term Loan Subtranche One [Member]          
Debt Instrument [Line Items]          
Term loan facility 60,000,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		     60,000,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		  
Line of credit facility expiration date Feb. 28, 2017        
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		     3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		  
Principal amount amortized, 2015 4,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		     4,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember		  
Term Loan Subtranche One [Member] | Minimum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term Loan Subtranche One [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Term Loan Subtranche One [Member] | Maximum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term Loan Subtranche One [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Term loan Subtranche Two [Member]          
Debt Instrument [Line Items]          
Term loan facility 6,300,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		     6,300,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		  
Line of credit facility expiration date Nov. 03, 2017        
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		     500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		  
Principal amount amortized, 2015 600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		     600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		  
Principal amount amortized, 2016 500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		     500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember		  
Term loan Subtranche Two [Member] | Minimum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term loan Subtranche Two [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Term loan Subtranche Two [Member] | Maximum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term loan Subtranche Two [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanThreeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Term Loan One [Member]          
Debt Instrument [Line Items]          
Term loan facility 87,500,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		     87,500,000us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		  
Debt instrument, term 5 years        
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 4,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		     4,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		  
Principal amount amortized, 2015 6,600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		     6,600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		  
Principal amount amortized, 2016 8,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		     8,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		  
Principal amount amortized, 2017 8,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		     8,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember		  
Term Loan One [Member] | Minimum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term Loan One [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Term Loan One [Member] | Maximum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Term Loan One [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TermLoanOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility 692,600,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		     692,600,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		  
Additional line of revolving credit facility 250,000,000ecpg_AdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		     250,000,000ecpg_AdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		  
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent) 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity including accordion agreement after amendment 1,100,000,000.0ecpg_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFacility
/ us-gaap_CreditFacilityAxis
= ecpg_RestatedCreditAgreementMember		     1,100,000,000.0ecpg_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFacility
/ us-gaap_CreditFacilityAxis
= ecpg_RestatedCreditAgreementMember		  
Debt instrument, term 5 years        
Line of credit facility expiration date Feb. 28, 2019        
Foreign Portfolio Investment Basket [Member]          
Debt Instrument [Line Items]          
Acquisition limit per acquisition $ 150,000,000.0ecpg_AcquisitionLimitPerAcquisition
/ us-gaap_CreditFacilityAxis
= ecpg_ForeignPortfolioInvestmentBasketMember		     $ 150,000,000.0ecpg_AcquisitionLimitPerAcquisition
/ us-gaap_CreditFacilityAxis
= ecpg_ForeignPortfolioInvestmentBasketMember