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Significant Accounting Policies and Consolidated Financial Statement Components Subsequent Events (Details) - Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member]	3 Months Ended
	Jun. 30, 2015	Nov. 30, 2005	May 31, 2005
Subsequent Event [Line Items]
Tender Offer Repurchase Amount	2.0
Tender Offer Repurchase Amount - Face Value	4.5
Debt Instrument, Interest Rate, Stated Percentage		5.875%	5.875%

X

- Definition

Tender Offer Repurchase Amount

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Tender Offer Repurchase Amount - Face Value

+ References

No definition available.

+ Details

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Namespace Prefix:	atlc_
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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Balance Type:
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