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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	$ 1,000,000cacc_MaximumHedgingReserve
Debt financing amount	300,000,000us-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	350,000,000us-gaap_RepaymentsOfSeniorDebt		0us-gaap_RepaymentsOfSeniorDebt	0us-gaap_RepaymentsOfSeniorDebt
Loss on extinguishment of debt	(21,800,000)us-gaap_GainsLossesOnExtinguishmentOfDebt		0us-gaap_GainsLossesOnExtinguishmentOfDebt	0us-gaap_GainsLossesOnExtinguishmentOfDebt
Debt covenants	1cacc_DebtInstrumentCovenantNetIncomeForPastTwoQuarters
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility	235,000,000us-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	3cacc_NumberWarehouseFacilities / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilitiesMember
Debt financing amount	475,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilitiesMember
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Debt financing amount	325,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember	[1]
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Debt financing amount	75,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember	[1]
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Debt financing amount	75,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember	[1]
Warehouse Facility Four And Five [Member]
Debt Instrument [Line Items]
Debt financing amount	75,000,000us-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					350,000,000us-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					21,800,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = cacc_TwoThousandAndSeventeenSeniorNotesMember
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Debt financing amount						300,000,000us-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							$ 3,600,000us-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

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- Definition

Maximum hedging reserve

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- Definition

Monthly Servicing Fee Per Financing

+ References

No definition available.

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- Definition

Number Warehouse Facilities

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- Definition

Percentage of collections on contributed loans

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- Definition

Percentage of net book value of loans, maximum.

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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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

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-Number 210

-Section 02

-Paragraph 22

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

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- Definition

Percentage of principal amount of debt redeemed.

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No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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