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Fair Values of Assets and Liabilities Summary of Fair Value Hierarchy for Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
CAR revolving credit facility | $ 20,000 | $ 20,000
ACC amortizing debt facility | 1,887 | 3,896
Amortizing debt facility | 6,721 |
Revolving credit facility | 4,000 | 1,456
Amortizing structured financing | 1,477 |
U.K. credit card accounts revolving credit facility | 7,783 | 1,213
5.875% Convertible Senior Notes | 95,178 | 94,886
Liabilities carried at fair value |  |
Interest rate swap underlying CAR facility | 124 | 175
Economic sharing arrangement liability | 550 | 815
Notes payable associated with structured financings, at fair value | 113,613 | 140,127
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
CAR revolving credit facility | 0 | 0
ACC amortizing debt facility | 0 | 0
Amortizing debt facility | 0 |
Revolving credit facility | 0 | 0
Amortizing structured financing | 0 |
U.K. credit card accounts revolving credit facility | 0 | 0
5.875% Convertible Senior Notes | 0 | 0
Liabilities carried at fair value |  |
Interest rate swap underlying CAR facility | 0 | 0
Economic sharing arrangement liability | 0 | 0
Notes payable associated with structured financings, at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
CAR revolving credit facility | 0 | 0
ACC amortizing debt facility | 0 | 0
Amortizing debt facility | 0 |
Revolving credit facility | 0 | 0
Amortizing structured financing | 0 |
U.K. credit card accounts revolving credit facility | 0 | 0
5.875% Convertible Senior Notes | 64,155 | 55,787
Liabilities carried at fair value |  |
Interest rate swap underlying CAR facility | 124 | 175
Economic sharing arrangement liability | 0 | 0
Notes payable associated with structured financings, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
CAR revolving credit facility | 20,000 | 20,000
ACC amortizing debt facility | 1,887 | 3,896
Amortizing debt facility | 6,721 |
Revolving credit facility | 4,000 | 1,456
Amortizing structured financing | 1,477 |
U.K. credit card accounts revolving credit facility | 7,783 | 1,213
5.875% Convertible Senior Notes | 0 | 0
Liabilities carried at fair value |  |
Interest rate swap underlying CAR facility | 0 | 0
Economic sharing arrangement liability | 550 | 815
Notes payable associated with structured financings, at fair value | $ 113,613 | $ 140,127

X
- Definition Assets that reflects the fair value of the consolidation of our securitization trusts presenting certain non-recourse, asset-backed structured financing debt facilities that is secured by these credit card receivables that are held within such trusts. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Amortized Structured Financing + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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. Fair value of credit card accounts lines of credit at the balance sheet date. + References No definition available. + Details
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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 the amount of economic sharing arrangement liability as of the balance sheet date. + References No definition available. + Details
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X
- Definition Fair value as of the balance sheet date of interest rate swap derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
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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. Fair value of merchant credit amortizing lines of credit at the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | atlc_
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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. Fair value of merchant credit product lines of credit at the balance sheet date. + References No definition available. + Details
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X
- Definition Debt that reflects the fair value of the consolidation of our securitization trusts presenting certain non-recourse, asset-backed structured financing debt facilities that are secured by these credit card receivables that are held within such trusts. + References No definition available. + Details
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Namespace Prefix: | atlc_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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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