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Debt (Schedule of General Information of Financing Transaction) (Details) - USD ($) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2015 | Jan. 22, 2014 | Sep. 30, 2015 | Jun. 11, 2015 | May. 19, 2015
Revolving Secured Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |  |
Line of credit maturity date |  |  |  | Jun. 22, 2018 |  |  |
Financing Amount |  |  |  | $ 310,000,000 |  | $ 235,000,000 |
Revolving Secured Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.875% |  |  |
Revolving Secured Line of Credit [Member] | Prime Rate [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.875% |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding Corp. II |  |  |
Debt maturity date | [1],[2] |  |  | Jul. 18, 2017 |  |  |
Debt facility financing amount |  |  |  | $ 400,000,000 | [1],[3] |  | $ 325,000,000
Warehouse Facility II [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | [1],[2] |  |  | 2.00% |  |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC IV |  |  |
Debt maturity date | [1],[2] |  |  | Apr. 30, 2018 |  |  |
Debt facility financing amount | [1],[3] |  |  | $ 75,000,000 |  |  |
Warehouse Facility IV [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | [1],[2] |  |  | 2.00% |  |  |
Warehouse Facility V [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC V |  |  |
Debt maturity date | [1],[4] |  |  | Sep. 10, 2017 |  |  |
Debt facility financing amount |  |  |  | $ 100,000,000 | [1],[3] | $ 75,000,000 |
Warehouse Facility V [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | [1],[2] |  |  | 1.60% |  |  |
Warehouse Facility VI [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC VI |  |  |
Debt maturity date | [1],[2] |  |  | Sep. 30, 2018 |  |  |
Debt facility financing amount | [1] |  |  | $ 75,000,000 |  |  |
Warehouse Facility VI [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | [1],[2] |  |  | 2.00% |  |  |
Term ABS 2013-1 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2013-1 |  |  |
Debt maturity date | [1],[2] |  |  | Apr. 15, 2015 |  |  |
Debt facility financing amount | [1] |  |  | $ 140,300,000.0 |  |  |
Term ABS 2013-2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2013-2 |  |  |
Debt maturity date | [1],[2] |  |  | Oct. 15, 2015 |  |  |
Debt facility financing amount | [1] |  |  | $ 197,800,000.0 |  |  |
Term ABS 2014-1 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2014-1 |  |  |
Debt maturity date | [1],[2] |  |  | Apr. 15, 2016 |  |  |
Debt facility financing amount | [1] |  |  | $ 299,000,000 |  |  |
Term ABS 2014-2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2014-2 |  |  |
Debt maturity date | [1],[2] |  |  | Sep. 15, 2016 |  |  |
Debt facility financing amount | [1] |  |  | $ 349,000,000.0 |  |  |
Term ABS 2015-1 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2015-1 |  |  |
Debt maturity date | [1],[2] |  |  | Jan. 16, 2017 |  |  |
Debt facility financing amount |  |  |  | $ 300,600,000 |  |  |
Term ABS 2015-2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2015-2 |  |  |
Debt maturity date | [1],[2] |  |  | Aug. 15, 2017 |  |  |
Debt facility financing amount |  |  |  | $ 300,200,000 |  |  |
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 | $ 300,000,000 |  |  |
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 |  | $ 250,000,000.0 |  | $ 250,000,000 |  |  |
[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 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 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: 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 + Details
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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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