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Debt (Scheduled Principal Maturities Of Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
2015	$ 354.3us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
2016	513.1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017	525.7us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018	59.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
After 2019	300.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total	1,752.5us-gaap_DebtInstrumentCarryingAmount
Revolving Secured Line Of Credit [Member]
2015	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
2016	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
2017	119.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
2018	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
After 2019	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Total	119.5us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Secured Debt [Member]
2015	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
2016	14.9us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
2017	44.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
2018	59.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
After 2019	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
Total	119.1us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember
Term ABS Financing [Member]
2015	354.3us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
2016	498.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
2017	361.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
2018	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
After 2019	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
Total	1,213.9us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = cacc_TermABSFinancingMember	[1]
Senior Notes [Member]
2015	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
2016	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
2017	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
2018	0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
After 2019	300.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Total	$ 300.0us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
[1] The principal maturities of the Term ABS transactions are estimated based on forecasted collections.

X

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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X

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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X

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

+ Details

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X

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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X

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Details

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- Details

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