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

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- 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 + Details
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X
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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 + Details
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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 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 + Details
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