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Deferred Court Costs, Net - Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |  |
Court costs advanced | $ 790,085 |  | $ 743,584 |  |  |
Court costs recovered | (318,088) |  | (299,606) |  |  |
Court costs reserve | (381,125) | $ (378,190) | (364,015) | $ (345,971) | $ (334,639) | $ (327,926)
Deferred court costs | $ 90,872 |  | $ 79,963 |  |  |

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- Definition Deferred court costs, advanced. + References No definition available. + Details
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Namespace Prefix: | ecpg_
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Balance Type: | debit
Period Type: | instant

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- Definition Deferred court costs, recovered. + References No definition available. + Details
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Namespace Prefix: | ecpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred court costs, reserve. + References No definition available. + Details
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Namespace Prefix: | ecpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant