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Debt (Summary of Additional Information of Credit facilities) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Revolving Secured Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Maximum outstanding balance | $ 206.3 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | $ 204.7 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Average outstanding balance | 107.9 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 80.6 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Warehouse Facility II [Member] |  |
Debt Instrument [Line Items] |  |
Maximum outstanding balance | 190.0 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember | 162.6 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember
Average outstanding balance | 27.7 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember | 58.4 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember
Warehouse Facility IV [Member] |  |
Debt Instrument [Line Items] |  |
Maximum outstanding balance | 35.0 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | 26.6 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember
Average outstanding balance | 6.4 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | 15.9 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 | 75.0 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember
Average outstanding balance | $ 15.2 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | $ 8.5 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityIVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |