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v2.4.1.9

Debt (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 21, 2014 | Jan. 22, 2014 | Jun. 23, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum hedging reserve | $ 1,000,000 cacc_MaximumHedgingReserve |  |  |  |  |  |
Debt financing amount | 300,000,000 us-gaap_DebtInstrumentFaceAmount |  |  |  |  |  |
Percentage of collections on contributed loans | 6.00%cacc_PercentageOfCollectionsOnContributedLoans |  |  |  |  |  |
Monthly servicing fee per financing | 6.00%cacc_MonthlyServicingFeePerFinancing |  |  |  |  |  |
Repayments of senior notes | 350,000,000 us-gaap_RepaymentsOfSeniorDebt |  | 0 us-gaap_RepaymentsOfSeniorDebt | 0 us-gaap_RepaymentsOfSeniorDebt |  |  |
Loss on extinguishment of debt | (21,800,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |
Debt covenants | 1 cacc_DebtInstrumentCovenantNetIncomeForPastTwoQuarters |  |  |  |  |  |
Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility | 235,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |
Percentage of net book value of loans | 80.00%cacc_PercentageOfNetBookValueOfLoans / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |
Warehouse Facilities [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of net book value of loans | 80.00%cacc_PercentageOfNetBookValueOfLoans / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilitiesMember |  |  |  |  |  |
Number of warehouse facilities | 3 cacc_NumberWarehouseFacilities / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilitiesMember |  |  |  |  |  |
Debt financing amount | 475,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilitiesMember |  |  |  |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember | [1] |  |  |  |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | [1] |  |  |  |  |
Warehouse Facility V [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1] |  |  |  |  |
Warehouse Facility Four And Five [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityFourAndFiveMember |  |  |  |  |  |
2017 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes stated interest rate |  |  |  |  | 9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cacc_TwoThousandAndSeventeenSeniorNotesMember |  |
Repayments of senior notes |  |  |  |  | 350,000,000 us-gaap_RepaymentsOfSeniorDebt / us-gaap_DebtInstrumentAxis = cacc_TwoThousandAndSeventeenSeniorNotesMember |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  | 104.563%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_DebtInstrumentAxis = cacc_TwoThousandAndSeventeenSeniorNotesMember |  |
Loss on extinguishment of debt |  |  |  |  | 21,800,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = cacc_TwoThousandAndSeventeenSeniorNotesMember |  |
2021 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing amount |  |  |  |  |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyOneSeniorNotesMember |
Close date, secured financings |  |  |  |  |  | Jan. 22, 2014 |
Senior notes stated interest rate |  |  |  |  |  | 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyOneSeniorNotesMember |
Mortgage Note [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 3,600,000 us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = cacc_MortgageNoteMember
[1] | Financing made available only to a specified subsidiary of the Company.

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- Definition Debt Instrument Covenant Net Income For Past Two Quarters + References No definition available. + Details
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Balance Type: | debit
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- Definition Maximum hedging reserve + References No definition available. + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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