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Debt (Schedule of General Information of Financing Transaction) (Details) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Jan. 22, 2014 | Mar. 30, 2015
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | n/a |  |  |
Line of credit maturity date | Jun. 23, 2017 |  |  |
Financing Amount | $ 235,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Revolving Secured Line of Credit [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Revolving Secured Line of Credit [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | CAC Warehouse Funding Corp. II | [1] |  |
Debt maturity date | Jul. 18, 2017 | [1],[2] |  |
Debt facility financing amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember | [1],[3] |  |
Warehouse Facility II [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIIMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | [1],[2] |  |
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | CAC Warehouse Funding LLC IV | [1] |  |
Debt maturity date | Apr. 05, 2016 | [1],[2] |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember | [1],[3] |  |
Warehouse Facility IV [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityIVMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | [1],[2] |  |
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | CAC Warehouse Funding LLC V | [1] |  |
Debt maturity date | Sep. 10, 2017 | [1],[4] |  |
Debt facility financing amount | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember | [1],[3] |  |
Warehouse Facility V [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cacc_WarehouseFacilityVMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | [1],[2] |  |
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],[2] |  |
Debt facility financing amount | 252,000,000 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],[2] |  |
Debt facility financing amount | 140,300,000.0 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],[2] |  |
Debt facility financing amount | 197,800,000.0 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],[2] |  |
Debt facility financing amount | 299,000,000 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],[2] |  |
Debt facility financing amount | 349,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember | [1] |  |
Term ABS 2015-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | Credit Acceptance Funding LLC 2015-1 | [1] |  |
Debt maturity date | Jan. 16, 2017 | [1],[2] |  |
Debt facility financing amount | 300,600,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember | [1] |  |
2021 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | n/a |  |  |
Debt maturity date | Feb. 15, 2021 |  | Feb. 15, 2021 |
Debt facility financing amount | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyOneSeniorNotesMember |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyOneSeniorNotesMember |
2023 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | n/a |  |  |
Debt maturity date | Mar. 15, 2023 |  |  | Mar. 15, 2023
Debt facility financing amount | $ 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyThreeSeniorNotesMember |  |  | $ 250,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cacc_TwoThousandTwentyThreeSeniorNotesMember
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.
[3] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[4] | 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 Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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=34725769&loc=d3e28878-108400 + Details
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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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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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 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
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Balance Type: | na
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 + Details
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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 + Details
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Period Type: | instant

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