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Fair Values of Assets and Liabilities Reconciliation of Level 3 Assets (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Reconciliation of Level 3 assets measured at fair value on a recurring basis using significant unobservable inputs [Abstract] |  |
Beginning Balance | $ 26,706 | $ 53,160
Net revaluations of loans and fees receivable pledged as collateral under structured financings, at fair value | 806 | 2,462
Net revaluations of loans and fees receivable, at fair value | 1,619 | 750
Settlements, net | (8,422) | (17,352)
Impact of foreign currency translation | (189) | (44)
Ending Balance | 20,520 | 38,976
Loans and Fees Receivable, at Fair Value [Member] |  |
Reconciliation of Level 3 assets measured at fair value on a recurring basis using significant unobservable inputs [Abstract] |  |
Beginning Balance | 6,353 | 18,255
Net revaluations of loans and fees receivable pledged as collateral under structured financings, at fair value | 0 | 0
Net revaluations of loans and fees receivable, at fair value | 1,619 | 750
Settlements, net | (2,528) | (7,449)
Impact of foreign currency translation | (189) | (44)
Ending Balance | 5,255 | 11,512
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member] |  |
Reconciliation of Level 3 assets measured at fair value on a recurring basis using significant unobservable inputs [Abstract] |  |
Beginning Balance | 20,353 | 34,905
Net revaluations of loans and fees receivable pledged as collateral under structured financings, at fair value | 806 | 2,462
Net revaluations of loans and fees receivable, at fair value | 0 | 0
Settlements, net | (5,894) | (9,903)
Impact of foreign currency translation | 0 | 0
Ending Balance | $ 15,265 | $ 27,464

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- Definition This element represents [net] revaluations of loans and fees receivable assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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- Definition This element represents [net] revaluations of loans and fees receivable pledged as collateral under structured financings of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Details
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