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Debt - Schedule of Convertible Features for Convertible Notes (Details) (USD $)	0 Months Ended
	Nov. 27, 2012	Jun. 24, 2013	Mar. 05, 2014	Mar. 31, 2015
2017 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Initial conversion price (in dollars per share)	$ 31.56us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandSeventeenConvertibleSeniorNotesMember			$ 31.56us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandSeventeenConvertibleSeniorNotesMember
Closing stock price at date of issuance (in dollars per share)	$ 25.66us-gaap_SharePrice / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandSeventeenConvertibleSeniorNotesMember
Conversion rate (shares per $1,000 principal amount)	31.6832us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandSeventeenConvertibleSeniorNotesMember
2020 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Initial conversion price (in dollars per share)		$ 45.72us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyConvertibleSeniorNotesMember		$ 45.72us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyConvertibleSeniorNotesMember
Closing stock price at date of issuance (in dollars per share)		$ 33.35us-gaap_SharePrice / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyConvertibleSeniorNotesMember
Conversion rate (shares per $1,000 principal amount)		21.8718us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyConvertibleSeniorNotesMember
2021 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Initial conversion price (in dollars per share)			$ 59.39us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyOneConvertibleSeniorNotesMember	$ 59.39us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyOneConvertibleSeniorNotesMember
Closing stock price at date of issuance (in dollars per share)			$ 47.51us-gaap_SharePrice / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyOneConvertibleSeniorNotesMember
Conversion rate (shares per $1,000 principal amount)			16.8386us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = ecpg_TwoThousandTwentyOneConvertibleSeniorNotesMember

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(5))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Conversion Rate

-URI http://asc.fasb.org/extlink&oid=6509012

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

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