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Significant Accounting Policies and Consolidated Financial Statement Components Fees and Related Income on Earning Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounting Policies [Abstract]
Fees on credit products	$ 5,385,000	$ 4,031,000	$ 9,301,000	$ 6,994,000
Changes in fair value of loans and fees receivable recorded at fair value	8,342,000	26,942,000	25,065,000	82,871,000
Changes in fair value of notes payable associated with structured financings recorded at fair value	(970,000)	(16,073,000)	(15,575,000)	(25,390,000)
Other	(2,538,000)	(469,000)	(1,766,000)	(177,000)
Total fees and related income on earning assets	10,219,000	14,431,000	17,025,000	64,298,000
Note receivable charge off	$ 2,400,000		$ 2,400,000

X

- Definition

This element represents [net] revaluations of notes payable liability measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

+ Details

Name:	atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityRevaluationsOfNotesPayable
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fees and related income on earning assets primarily include: (1) lending fees; (2) fees associated with our credit card receivables; (3) changes in the fair value of loans and fees receivable; (4) changes in fair value of notes payable associated with structured financings; (5) income on investments in previously charged-off receivables; (6) gross profits and losses from auto sales; (7) gains associated with investments in securities; and (8) gains realized associated with our settlement of litigation.

+ References

No definition available.

+ Details

Name:	atlc_FeesAndRelatedIncomeOnEarningAssets
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Refers to the increase (decrease) during the reporting period in fair value of loans and fees receivable recorded at fair value.

+ References

No definition available.

+ Details

Name:	atlc_IncreaseDecreaseInFairValueOfLoansAndFeesReceivableRecordedAtFairValue
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Note Receivable, Charge Off

+ References

No definition available.

+ Details

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

X

- Definition

Refers to the other fees and related income on earning assets.

+ References

No definition available.

+ Details

Name:	atlc_OtherFeesAndRelatedIncomeOnEarningAssets
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Definition

Income earned from credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13 (d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_FeesAndCommissionsCreditCards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration