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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Estimate of possible charge for penalties and restitution (in excess of) $ 35,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
Material reserves for litigation 0ecpg_MaterialReservesForLitigation
Purchase price of receivable portfolios 1,700,000,000ecpg_PurchaseCommitmentFaceAmount
Purchase price $ 196,600,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted