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Significant Accounting Policies and Consolidated Financial Statement Components Loans and Fees Receivable, Net Narrative (Details)	12 Months Ended
	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

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Namespace Prefix:	atlc_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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