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Fair Values of Assets and Liabilities, Other Relevant Data (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Nov. 30, 2005
May 31, 2005
Schedule of Fair Value Assets And Liabilities [Line Items]        
CAR revolving credit facility $ 29,250us-gaap_DerivativeAmountOfHedgedItem $ 28,500us-gaap_DerivativeAmountOfHedgedItem    
Structured Financing Notes Payable [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance of notes payable 116,656atlc_FairValueOptionNotesPayableUnpaidPrincipalBalance
/ us-gaap_FairValueByLiabilityClassAxis
= atlc_StructuredFinancingNotesPayableMember		 121,236atlc_FairValueOptionNotesPayableUnpaidPrincipalBalance
/ us-gaap_FairValueByLiabilityClassAxis
= atlc_StructuredFinancingNotesPayableMember		    
Aggregate fair value of notes payable 32,294atlc_FairValueOptionNotesPayableReportedAtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= atlc_StructuredFinancingNotesPayableMember		 36,511atlc_FairValueOptionNotesPayableReportedAtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= atlc_StructuredFinancingNotesPayableMember		    
Loans and Fees Receivable, at Fair Value [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 17,820atlc_FairValueOptionLoansandFeesReceivableUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		 22,785atlc_FairValueOptionLoansandFeesReceivableUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		    
Aggregate fair value of loans and fees receivable that are reported at fair value 13,147us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		 18,255us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		    
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 19us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		 93us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		    
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable 555us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		 647us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivableMember		    
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 36,527atlc_FairValueOptionLoansandFeesReceivableUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		 41,449atlc_FairValueOptionLoansandFeesReceivableUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		    
Aggregate fair value of loans and fees receivable that are reported at fair value 30,743us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		 34,905us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		    
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 36us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		 39us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		    
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable $ 1,355us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		 $ 1,695us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_FairValueByAssetClassAxis
= atlc_LoansAndFeesReceivablePledgedAsCollateralMember		    
5.875% Convertible Senior Notes Due 2035 [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Interest rate on notes     5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= atlc_FivePointEightSevenFivePercentConvertibleSeniorNotesDueTwoThousandThirtyFiveMember		 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= atlc_FivePointEightSevenFivePercentConvertibleSeniorNotesDueTwoThousandThirtyFiveMember