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Debt (Schedule Of General Information Of Financing Transaction) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | n/a |
Debt maturity date | Feb. 15, 2021 |
Debt financing amount | $ 300.0 us-gaap_DebtInstrumentFaceAmount |
Revolving Secured Line Of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | n/a |
Debt maturity date | Jun. 23, 2017 |
Financing Amount | 235.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |
Warehouse Facility II [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | CAC Warehouse Funding Corp. II | [1],[2]
Debt maturity date | Jul. 18, 2017 | [1],[3]
Debt financing amount | 325.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIiMember | [1]
Warehouse Facility IV [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | CAC Warehouse Funding LLC IV | [1],[2]
Debt maturity date | Apr. 05, 2016 | [1],[3]
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | [1]
Warehouse Facility V [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | CAC Warehouse Funding LLC V | [1],[2],[4]
Debt maturity date | Sep. 10, 2017 | [1],[5]
Debt financing amount | 75.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1]
Term ABS 2012-1 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2012-1 | [1]
Debt maturity date | Mar. 17, 2014 | [1],[3]
Debt financing amount | 201.3 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember | [1]
Term ABS 2012-2 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2012-2 | [1]
Debt maturity date | Sep. 15, 2014 | [1],[3]
Debt financing amount | 252.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember | [1]
Term ABS 2013-1 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2013-1 | [1]
Debt maturity date | Apr. 15, 2015 | [1],[3]
Debt financing amount | 140.3 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember | [1]
Term ABS 2013-2 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2013-2 | [1]
Debt maturity date | Oct. 15, 2015 | [1],[3]
Debt financing amount | 197.8 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember | [1]
Term ABS 2014-1 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2014-1 | [1]
Debt maturity date | Apr. 15, 2016 | [1],[3]
Debt financing amount | 299.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember | [1]
Term ABS 2014-2 [Member] |  |
Debt Instrument [Line Items] |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2014-2 | [1]
Debt maturity date | Sep. 15, 2016 | [1],[3]
Debt financing amount | $ 349.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember | [1]
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[3] | Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.
[4] | In connection with the renewal of this warehouse facility in the third quarter of 2014, we formed a new wholly owned subsidiary, CAC Warehouse Funding LLC V, which replaced CAC Warehouse Funding III, LLC.
[5] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on September 10, 2019 will be due.

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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
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity). + 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 + Details
Name: | us-gaap_DebtInstrumentIssuer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date when the debt instrument is scheduled to be fully repaid, 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityIiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityIVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=cacc_WarehouseFacilityVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
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Balance Type: |
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