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Debt (Schedule Of Outstanding Debt Amount) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mar. 29, 2012
Sep. 20, 2012
Apr. 25, 2013
Oct. 31, 2013
Debt Instrument [Line Items]            
Balance outstanding $ 119.5us-gaap_LineOfCredit $ 102.8us-gaap_LineOfCredit        
Balance outstanding 300.0us-gaap_SeniorLongTermNotes 350.2us-gaap_SeniorLongTermNotes        
Restricted cash and cash equivalents pledged as collateral 157.6us-gaap_RestrictedCashAndCashEquivalents 111.3us-gaap_RestrictedCashAndCashEquivalents        
Revolving Secured Line Of Credit [Member]            
Debt Instrument [Line Items]            
Balance outstanding 119.5us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
102.8us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
       
Amount available for borrowing 115.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
[1] 132.2us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
[1]        
Interest rate 2.16%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
2.04%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
       
Warehouse Facility II [Member]            
Debt Instrument [Line Items]            
Balance outstanding 81.3us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
       
Amount available for borrowing 243.7us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
[1] 325.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
[1]        
Loans pledged as collateral 104.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
       
Restricted cash and cash equivalents pledged as collateral 2.0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
1.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
       
Interest rate 2.16%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
2.17%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember
       
Warehouse Facility IV [Member]            
Debt Instrument [Line Items]            
Balance outstanding 19.9us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
       
Amount available for borrowing 55.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
[1] 75.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
[1]        
Loans pledged as collateral 44.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
       
Restricted cash and cash equivalents pledged as collateral 1.4us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
0.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
       
Interest rate 2.17%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
2.17%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
       
Warehouse Facility V [Member]            
Debt Instrument [Line Items]            
Balance outstanding 17.9us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[2] 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[2]        
Amount available for borrowing 57.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[1] 75.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[1]        
Loans pledged as collateral 34.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
       
Restricted cash and cash equivalents pledged as collateral 1.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
0.3us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
       
Interest rate 1.77%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
1.77%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
       
Term ABS 2011-1 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
144.2us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
       
Loans pledged as collateral 0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
215.3us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
       
Restricted cash and cash equivalents pledged as collateral 0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
23.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
       
Interest rate 0.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
3.01%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandElevenOneMember
       
Term ABS 2012-1 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 43.8us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
201.3us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
       
Loans pledged as collateral 145.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
240.4us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
251.7us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
     
Restricted cash and cash equivalents pledged as collateral 19.3us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
23.5us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
       
Interest rate 3.04%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
2.38%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
       
Term ABS 2012-2 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 184.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
252.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
       
Loans pledged as collateral 278.6us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
303.8us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
  315.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
   
Restricted cash and cash equivalents pledged as collateral 27.8us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
27.7us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
       
Interest rate 1.67%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
1.63%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
       
Term ABS 2013-1 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 140.3us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
140.3us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
       
Loans pledged as collateral 186.7us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
184.3us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
    187.8us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
 
Restricted cash and cash equivalents pledged as collateral 16.7us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
15.3us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
       
Interest rate 1.31%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
1.31%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
       
Term ABS 2013-2 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 197.8us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
197.8us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
       
Loans pledged as collateral 248.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
250.5us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
      250.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
Restricted cash and cash equivalents pledged as collateral 21.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
18.7us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
       
Interest rate 1.67%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
1.67%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
       
Term ABS 2014-1 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 299.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
       
Loans pledged as collateral 426.2us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
       
Restricted cash and cash equivalents pledged as collateral 31.6us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
       
Interest rate 1.72%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
0.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenOneMember
       
Term ABS 2014-2 [Member]            
Debt Instrument [Line Items]            
Balance outstanding 349.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
       
Loans pledged as collateral 440.7us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
       
Restricted cash and cash equivalents pledged as collateral 36.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
       
Interest rate 2.05%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
0.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingTwoThousandFourteenTwoMember
       
2017 Senior Notes [Member]            
Debt Instrument [Line Items]            
Balance outstanding 0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember
350.2us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember
[3]        
Interest rate 0.00%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember
9.125%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember
       
Unamortized debt premium net   0.2us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember
       
2021 Senior Notes [Member]            
Debt Instrument [Line Items]            
Balance outstanding $ 300.0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
$ 0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
       
Interest rate 6.125%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
0.00%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
       
[1] Availability may be limited by the amount of assets pledged as collateral.
[2] 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.
[3] As of December 31, 2013 the outstanding balance presented for the 2017 Senior Notes includes a net unamortized debt premium of $0.2 million.