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Significant Accounting Policies and Consolidated Financial Statement Components Loans and Fees Receivable, Net Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |
Weighted Average Remaining Accretion Period of Deferred Revenue | 11 months | 11 months

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

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration