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Significant Accounting Policies and Consolidated Financial Statement Components Rental Merchandise (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Leased Merchandise [Abstract]
Depreciation of rental merchandise	$ 27	$ 5,273

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- Definition

Depreciation of leased merchandise

+ References

No definition available.

+ Details

Name:	atlc_Depreciationofleasedmerchandise
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Leased Merchandise [Abstract]

+ References

No definition available.

+ Details

Name:	atlc_LeasedMerchandiseAbstract
Namespace Prefix:	atlc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration