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Significant Accounting Policies and Consolidated Financial Statement Components (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 category_of_credit_card_receivable | Jun. 30, 2012 | Dec. 31, 2012 category_of_credit_card_receivable
Accounting Policies [Abstract] |  |  |
Number of categories of credit card receivables significantly affected by estimates | 2 |  | 2
Weighted Average Remaining Accretion Period of Deferred Revenue | 14 months | 13 months |
Number of days for charge off uncollectible loans and fees receivable | 180 days |  |

X
- Definition This line item represents the number of categories of credit card receivables that are significantly affected by estimates. + References No definition available. + Details
Name: | atlc_NumberOfCategoriesOfCreditCardReceivablesSignificantlyAffectedByEstimates
Namespace Prefix: | atlc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the number of days until an uncollectible loans and fee receivable is charged off. + References No definition available. + Details
Name: | atlc_NumberOfDaysForChargeOffUncollectibleLoansAndFeesReceivable
Namespace Prefix: | atlc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This line item represents the weighted average remaining accretion period of deferred revenue during the reporting the period. + References No definition available. + Details
Name: | atlc_WeightedAverageRemainingAccretionPeriodOfDeferredRevenue
Namespace Prefix: | atlc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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