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Significant Accounting Policies and Consolidated Financial Statement Components (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2013 category_of_credit_card_receivable	Jun. 30, 2012	Dec. 31, 2012 category_of_credit_card_receivable
Accounting Policies [Abstract]
Number of categories of credit card receivables significantly affected by estimates	2		2
Weighted Average Remaining Accretion Period of Deferred Revenue	14 months	13 months
Number of days for charge off uncollectible loans and fees receivable	180 days

X

- Definition

This line item represents the number of categories of credit card receivables that are significantly affected by estimates.

+ References

No definition available.

+ Details

Name:	atlc_NumberOfCategoriesOfCreditCardReceivablesSignificantlyAffectedByEstimates
Namespace Prefix:	atlc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to the number of days until an uncollectible loans and fee receivable is charged off.

+ References

No definition available.

+ Details

Name:	atlc_NumberOfDaysForChargeOffUncollectibleLoansAndFeesReceivable
Namespace Prefix:	atlc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

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