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Income Taxes - Unrecognized Tax Benefit (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Beginning Balance $ 71,273us-gaap_UnrecognizedTaxBenefits $ 1,784us-gaap_UnrecognizedTaxBenefits $ 1,230us-gaap_UnrecognizedTaxBenefits
Decreases related to prior year tax positions   (712)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromAcquisition (361)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromAcquisition
Increases related to current and prior year tax positions     915ecpg_UnrecognizedTaxBenefitsIncreaseResultingfromCurrentandPriorPeriodTaxPositions
Increases related to prior year tax positions 33,027us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 70,201us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Increases related to current year tax positions 1,329us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions    
Decreases related to settlements with taxing authorities (67,204)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities    
Ending Balance $ 38,425us-gaap_UnrecognizedTaxBenefits $ 71,273us-gaap_UnrecognizedTaxBenefits $ 1,784us-gaap_UnrecognizedTaxBenefits