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Debt (Summary Of Additional Information Of Credit facilities) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revolving Secured Line Of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | $ 204.7 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  | $ 195.1 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |
Average outstanding balance | 103.6 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  | 97.9 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 290.2 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember |  | 169.1 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember |
Average outstanding balance | 70.3 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember |  | 81.8 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember |
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 26.7 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember |  | 39.6 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember |
Average outstanding balance | 22.0 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember |  | 11.8 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember |
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 75.0 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1] | 60.0 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1]
Average outstanding balance | $ 9.2 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1] | $ 23.3 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1]
[1] | In connection with the renewal of this warehouse facility in the third quarter of 2014, we formed a new wholly owned subsidiary, CAC Warehouse Funding LLC V, which replaced CAC Warehouse Funding III, LLC.

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- Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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