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Description Of Business (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 loan portfolio_segment
Description Of Business [Abstract] |
Number of Portfolio Segments | 2 cacc_NumberofPortfolioSegments
Number of consumers required to group advances | 100 cacc_NumberOfConsumersRequiredToGroupAdvances
Number of Consumer Loans assigned to receive accelerated Dealer Holdback payment | 100 cacc_NumberOfConsumerLoansAssignedToReceiveAcceleratedDealerHoldbackPayment
Servicing fee percentage in collections | 20.00%cacc_ServiceFeeIncomeAsPercentageOfCollections
One-time enrollment fee in program | $ 9,850 cacc_RevenueFromEnrollmentAndRegistrationFeesInProgram
Percentage of enrollment fee of first accelerated dealer holdback payment | 50.00%cacc_PercentageOfRevenueFromEnrollmentAndRegistrationFeesInProgram

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- Details
Name: | cacc_DescriptionOfBusinessAbstract
Namespace Prefix: | cacc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Consumer Loans Assigned To Receive Accelerated Dealer Holdback Payment + References No definition available. + Details
Name: | cacc_NumberOfConsumerLoansAssignedToReceiveAcceleratedDealerHoldbackPayment
Namespace Prefix: | cacc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Consumers Required To Group Advances + References No definition available. + Details
Name: | cacc_NumberOfConsumersRequiredToGroupAdvances
Namespace Prefix: | cacc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Portfolio Segments + References No definition available. + Details
Name: | cacc_NumberofPortfolioSegments
Namespace Prefix: | cacc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Revenue From Enrollment And Registration Fees In Program + References No definition available. + Details
Name: | cacc_PercentageOfRevenueFromEnrollmentAndRegistrationFeesInProgram
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue From Enrollment And Registration Fees In Program + References No definition available. + Details
Name: | cacc_RevenueFromEnrollmentAndRegistrationFeesInProgram
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Service fee income as a percentage of collections. + References No definition available. + Details
Name: | cacc_ServiceFeeIncomeAsPercentageOfCollections
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration