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Fair Value Measurements - Change in Redeemable Noncontrolling Interests (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Redeemable Noncontrolling Interests [Roll Forward]
Balance at beginning of period	$ 28,885us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount	$ 26,564us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Initial redeemable noncontrolling interest related to business combinations		4,997ecpg_RedeemableNoncontrollingInterestIncreaseFromBusinessCombination
Net income attributable to redeemable noncontrolling interests	468us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest	(4,513)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Adjustment of the redeemable noncontrolling interests to fair value	664us-gaap_MinorityInterestChangeInRedemptionValue	5,730us-gaap_MinorityInterestChangeInRedemptionValue
Effect of foreign currency translation attributable to redeemable noncontrolling interests	(1,582)ecpg_NoncontrollingInterestForeignCurrencyTransactionandTranslationAdjustment	(3,893)ecpg_NoncontrollingInterestForeignCurrencyTransactionandTranslationAdjustment
Balance at end of period	$ 28,435us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount	$ 28,885us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount

X

- Definition

Noncontrolling Interest, Foreign Currency Transaction and Translation Adjustment

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Redeemable Noncontrolling Interest Increase From Business Combination

+ References

No definition available.

+ Details

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X

- Definition

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.19)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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X

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (16)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 15

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (12)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

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