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Debt - Encore Senior Secured Notes (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   $ 75,000,000ecpg_SeniorNotesOriginalAmount  
Senior secured notes 43,750,000us-gaap_SeniorNotes   58,750,000us-gaap_SeniorNotes
Basis spread over the current Treasury Rate (percent) 0.50%ecpg_SeniorSecuredNotesPresentValueInputsDiscountRateSpread    
2011 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   25,000,000ecpg_SeniorNotesOriginalAmount
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandElevenSeniorSecuredNotesMember
 
Debt instrument, interest rate   7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandElevenSeniorSecuredNotesMember
 
Debt instrument maturity date   2018  
Senior Secured Notes, periodic principal repayment   1,300,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandElevenSeniorSecuredNotesMember
 
2010 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   50,000,000ecpg_SeniorNotesOriginalAmount
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandTenSeniorSecuredNotesMember
 
Debt instrument, interest rate   7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandTenSeniorSecuredNotesMember
 
Debt instrument maturity date   2017  
Senior Secured Notes, periodic principal repayment   $ 2,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= ecpg_TwoThousandTenSeniorSecuredNotesMember