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Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |
Debt financing amount | $ 300.0 us-gaap_DebtInstrumentFaceAmount |  |  |
Interest rate swap agreements outstanding | 0.1 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |  |  |
Warehouse Facility II [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 325.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember | [1] |  |
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 325.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 325.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Start date | 12/2014 |  | 06/2013 |
End date | 06/2016 |  | 12/2014 |
Notional value | 325.0 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 325.0 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Cap Interest Rate | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [2] | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [2]
Warehouse Facility III [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  |  | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |
Start date |  |  | 06/2012 |
End date |  |  | 07/2015 |
Notional value |  |  | 56.3 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |
Cap Interest Rate |  |  | 5.00%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember | [2]
Warehouse Facility IV [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | [1] |  |
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Start date | 08/2011 |  | 08/2011 |
End date | 09/2015 |  | 09/2015 |
Notional value | 29.3 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 75.0 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [3]
Cap Interest Rate | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [2] | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [2]
Warehouse Facility IV Member Starting March 2014 [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  |  |
Start date | 03/2014 |  |  |
End date | 03/2017 |  |  |
Notional value | 45.7 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  |  |
Cap Interest Rate | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [2] |  |
Warehouse Facility V [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1] |  |
Warehouse Facility V [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |  |  |
Start date | 06/2012 |  |  |
End date | 07/2015 |  |  |
Notional value | $ 56.3 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember | [3] |  |
Cap Interest Rate | 5.00%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember | [2] |  |
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Rate excludes the spread over the LIBOR rate or the commercial paper rate, as applicable.
[3] | 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. The interest rate cap associated with this facility was reassigned from Warehouse Facility III to Warehouse Facility V.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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Balance Type: | na
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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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