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Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |  |  |
Interest rate caps, fair value of less than $0.1 million | $ 100,000 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |  | $ 100,000 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
Warehouse Facility II [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember | [1],[2] |  |
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Start |  |  | Dec. 01, 2014 |
End | Jun. 01, 2016 |  | Jun. 01, 2016 |
Notional | 325,000,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 325,000,000 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 | [3] | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [3]
Term ABS 2012-2 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 252,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember | [1] |  |
Start | Dec. 01, 2014 |  |  |
Warehouse Facility IV [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | [1],[2] |  |
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Start | Aug. 01, 2011 |  | Aug. 01, 2011 |
End | Sep. 01, 2015 |  | Sep. 01, 2015 |
Notional | 18,000,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 29,300,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Cap Interest Rate | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [3] | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [3]
Warehouse Facility IV Member Starting March 2014 [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |
Start | Mar. 01, 2014 |  | Mar. 01, 2014 |
End | Mar. 01, 2017 |  | Mar. 01, 2017 |
Notional | 57,000,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember |  | 45,700,000 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 | [3] | 5.50%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMemberStartingMarch2014Member / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePointFivePercentCapInterestRateMember | [3]
Warehouse Facility V [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1],[2] |  |
Warehouse Facility V [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |  | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |
Start | Jun. 01, 2012 |  | Jun. 01, 2012 |
End | Jul. 01, 2015 |  | Jul. 01, 2015 |
Notional | $ 56,300,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |  | $ 56,300,000 invest_DerivativeNotionalAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember |
Cap Interest Rate | 5.00%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember | [3] | 5.00%us-gaap_DerivativeCapInterestRate / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_DerivativeInstrumentRiskAxis = cacc_FivePercentCapInterestRateMember | [3]
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[3] | Rate excludes the spread over the LIBOR rate or the commercial paper rate, as applicable.

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- Definition Interest Rate Contracts Inception Date + References No definition available. + Details
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- Definition Interest Rate Contracts Maturity Date + References No definition available. + Details
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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=34725769&loc=d3e28878-108400 + Details
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Period Type: | instant

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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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- Definition Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 3: 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=51825145&loc=SL20226006-175313 Reference 4: 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=56946850&loc=d3e41678-113959 + Details
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