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Fair Values of Assets and Liabilities Reconciliation of Level 3 Assets (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Reconciliation of Level 3 assets measured at fair value on a recurring basis using significant unobservable inputs [Abstract] |  |
Beginning Balance | $ 153,973 | $ 266,989
Total gains—realized/unrealized: |  |
Net revaluations of loans and fees receivable pledged as collateral under structured financings, at fair value | 19,789 | 75,471
Net revaluations of loans and fees receivable, at fair value | 5,276 | 7,400
Settlements, net | (53,545) | (143,952)
Impact of foreign currency translation | (2,573) | 1,144
Net transfers in and/or out of Level 3 | 0 | 0
Ending Balance | 122,920 | 207,052
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 | 20,378 | 28,226
Total gains—realized/unrealized: |  |
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 | 5,276 | 7,400
Settlements, net | (9,992) | (14,780)
Impact of foreign currency translation | 0 | 0
Net transfers in and/or out of Level 3 | 0 | 0
Ending Balance | 15,662 | 20,846
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 | 133,595 | 238,763
Total gains—realized/unrealized: |  |
Net revaluations of loans and fees receivable pledged as collateral under structured financings, at fair value | 19,789 | 75,471
Net revaluations of loans and fees receivable, at fair value | 0 | 0
Settlements, net | (43,553) | (129,172)
Impact of foreign currency translation | (2,573) | 1,144
Net transfers in and/or out of Level 3 | 0 | 0
Ending Balance | $ 107,258 | $ 186,206

X
- Definition This element represents impact of foreign currency translation on 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
Name: | atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslation
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Refers to fair value measurement with unobservable inputs reconciliation recurring basis asset gain loss realized unrealized amount. + References No definition available. + Details
Name: | atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossRealizedUnrealizedAmount
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRevaluationsOfLoansAndFeesReceivable
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRevaluationsOfLoansAndFeesReceivablePledgedAsCollateral
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant