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Significant Accounting Policies and Consolidated Financial Statement Components Fees and Related Income on Earning Assets (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accounting Policies [Abstract] |  |  |  |
Fees on credit products | $ 5,385,000 | $ 4,031,000 | $ 9,301,000 | $ 6,994,000
Changes in fair value of loans and fees receivable recorded at fair value | 8,342,000 | 26,942,000 | 25,065,000 | 82,871,000
Changes in fair value of notes payable associated with structured financings recorded at fair value | (970,000) | (16,073,000) | (15,575,000) | (25,390,000)
Other | (2,538,000) | (469,000) | (1,766,000) | (177,000)
Total fees and related income on earning assets | 10,219,000 | 14,431,000 | 17,025,000 | 64,298,000
Note receivable charge off | $ 2,400,000 |  | $ 2,400,000 |

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- Definition This element represents [net] revaluations of notes payable liability 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
Name: | atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityRevaluationsOfNotesPayable
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fees and related income on earning assets primarily include: (1) lending fees; (2) fees associated with our credit card receivables; (3) changes in the fair value of loans and fees receivable; (4) changes in fair value of notes payable associated with structured financings; (5) income on investments in previously charged-off receivables; (6) gross profits and losses from auto sales; (7) gains associated with investments in securities; and (8) gains realized associated with our settlement of litigation. + References No definition available. + Details
Name: | atlc_FeesAndRelatedIncomeOnEarningAssets
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Refers to the increase (decrease) during the reporting period in fair value of loans and fees receivable recorded at fair value. + References No definition available. + Details
Name: | atlc_IncreaseDecreaseInFairValueOfLoansAndFeesReceivableRecordedAtFairValue
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Note Receivable, Charge Off + References No definition available. + Details
Name: | atlc_NoteReceivableChargeOff
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Refers to the other fees and related income on earning assets. + References No definition available. + Details
Name: | atlc_OtherFeesAndRelatedIncomeOnEarningAssets
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income earned from credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_FeesAndCommissionsCreditCards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration