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Debt (Schedule Of Outstanding Term ABS Financings) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Mar. 29, 2012 | Sep. 20, 2012 | Apr. 25, 2013 | Oct. 31, 2013 | Apr. 16, 2014 | Sep. 25, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Term ABS 2012-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings | Mar. 29, 2012 |  |  |  |  |  |  |
Loans pledged as collateral | $ 251.7 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember |  |  |  |  |  | $ 145.1 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember | $ 240.4 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
Term ABS 2012-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings |  | Sep. 20, 2012 |  |  |  |  |  |
Loans pledged as collateral |  | 315.1 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember |  |  |  |  | 278.6 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember | 303.8 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
Term ABS 2013-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings |  |  | Apr. 25, 2013 |  |  |  |  |
Loans pledged as collateral |  |  | 187.8 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember |  |  |  | 186.7 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember | 184.3 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
Term ABS 2013-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings |  |  |  | Oct. 31, 2013 |  |  |  |
Loans pledged as collateral |  |  |  | 250.1 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember |  |  | 248.9 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember | 250.5 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember
Term ABS 2014-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings |  |  |  |  | Apr. 16, 2014 |  |  |
Loans pledged as collateral |  |  |  |  | 374.7 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember |  |  |
Term ABS 2014-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Close date, secured financings |  |  |  |  |  | Sep. 25, 2014 |  |
Loans pledged as collateral |  |  |  |  |  | $ 437.6 us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember |  |

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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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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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