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Description of Business (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
loan
program
Description Of Business [Abstract]  
Number of business programs 2cacc_NumberOfBusinessPrograms
Number of consumers required to group advances 100cacc_NumberOfConsumersRequiredToGroupAdvances
Number of consumer loans assigned to receive accelerated Dealer Holdback payment 100cacc_NumberOfConsumerLoansAssignedToReceiveAcceleratedDealerHoldbackPayment
Servicing fee percentage in collections 20.00%cacc_ServiceFeeIncomeAsPercentageOfCollections
One-time enrollment fee in program $ 9,850cacc_RevenueFromEnrollmentAndRegistrationFeesInProgram
Percentage of enrollment fee of first accelerated dealer holdback payment 50.00%cacc_PercentageOfRevenueFromEnrollmentAndRegistrationFeesInProgram