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Fair Values of Assets and Liabilities, Other Relevant Data (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Fair Value Assets And Liabilities [Line Items] |  |
Aggregate unpaid principal balance of notes payable | $ 241,675 | $ 287,711
Loans and Fees Receivable, at Fair Value [Member] |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value | 21,213 | 26,154
Aggregate fair value of loans and fees receivable that are reported at fair value | 15,662 | 20,378
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 29 | 36
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable | 799 | 1,643
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member] |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value | 144,322 | 192,433
Aggregate fair value of loans and fees receivable that are reported at fair value | 107,258 | 133,595
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 415 | 957
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable | 6,116 | 7,591
Structured Financing Notes Payable [Member] |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |
Aggregate fair value of notes payable | $ 113,613 | $ 140,127

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- Definition This item represents the aggregate unpaid principal balance within loans and fees receivables that are reported at fair value for which the fair value option has been elected. + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the aggregate fair value of notes payable for which the fair value option has been elected. + References No definition available. + Details
Name: | atlc_FairValueOptionNotesPayableReportedAtFairValue
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the aggregate unpaid principal balance within notes payable that are reported at fair value for which the fair value option has been elected. + References No definition available. + Details
Name: | atlc_FairValueOptionNotesPayableUnpaidPrincipalBalance
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph e(1) -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_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 4 -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: | instant